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Free Elektor magazine May 2013 Get a FREE copy of Elektor magazine’s May issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR0513 into your shopping cart. The magazine will add 5.2 ounces to the package weight when calculating your shipping options.

	On sale! Pololu item #: 1270 Price: $11.95 $19.95 Quantity:
LPR550AL Dual-Axis (Pitch and Roll or XY) Gyro with ±500°/s and ±2000°/s Ranges This gyroscope board is a basic carrier/breakout board for the ST LPR550AL dual-axis gyro, which measures the angular rates of rotation about the pitch (x) and roll (y) axes. Two separate analog voltage outputs for each axis provide angular velocity ranges of ±500°/s and ±2000°/s. This board has a 3.3V regulator for easy integration with 5 V parts, includes a low-pass filter on each output for noise reduction, and is smaller than competing products, all at a lower price. Clearance: This board is being replaced by the L3GD20 3-axis gyro carrier.

	On sale! Pololu item #: 1271 Price: $11.95 $19.95 Quantity:
LPY550AL Dual-Axis (Pitch and Yaw or XZ) Gyro with ±500°/s and ±2000°/s Ranges This gyroscope board is a basic carrier/breakout board for the ST LPY550AL dual-axis gyro, which measures the angular rates of rotation about the pitch (x) and yaw (z) axes. Two separate analog voltage outputs for each axis provide angular velocity ranges of ±500°/s and ±2000°/s. This board has a 3.3V regulator for easy integration with 5 V parts, includes a low-pass filter on each output for noise reduction, and is smaller than competing products, all at a lower price. Clearance: This board is being replaced by the L3GD20 3-axis gyro carrier.

	On sale! Pololu item #: 1273 Price: $11.95 $17.95 Quantity:
LSM303DLM 3D Compass and Accelerometer Carrier with Voltage Regulators The LSM303DLM combines a digital 3-axis accelerometer and 3-axis magnetometer into a single package that is ideal for making a tilt-compensated compass. The six independent readings, whose sensitivities can be set in the ranges of ±2 to ±8 g and ±1.3 to ±8.1 gauss, are available through an I²C interface. This LSM303 carrier board operates from 2.6 to 5.5 V and has a 0.1″ pin spacing. Clearance: This board is being replaced by the newer, pin-compatible LSM303DLHC carrier.

	On sale! Pololu item #: 331 Price: $3.99 $5.75 Quantity:
PCB02A 8-pin PIC prototyping PCB This printed circuit board is designed for building your own circuits based on Microchip Technology’s line of 8-pin PIC microcontrollers. The board holds a PIC and the basic circuitry necessary to run it. The rest of the board is available for your custom circuits.

	On sale! New! Pololu item #: 2390 Price: $13.95 $19.50 Quantity:
Tamiya 72007 4-Speed High-Power Gearbox Kit With possible gear ratios of 39.6:1, 47.6:1, 61.7:1, and 74:1, the Tamiya 72007 4-Speed High-Power Gearbox is well-suited for most applications that require a balance of speed and torque.

	On sale! New! Pololu item #: 2391 Price: $13.95 $19.50 Quantity:
Tamiya 72008 4-Speed Worm Gearbox Kit The primary feature of this gearbox is a worm gear, which locks the output shaft when the motor is not turning. Its high gear ratios of 84:1, 216:1, 555.4:1, and 1428.2:1 make this gearbox appropriate for small walking robots, lifting mechanisms, and other applications where high torque is desired.

	On sale! Pololu item #: 330 Price: $11.95 $16.50 Quantity:
PCB01A 5" Round Prototyping PCB This round printed circuit board is a general-purpose prototyping board for developing your own custom electronics designs. Slightly larger than a CD, this PCB also fits our round robot chassis perfectly. With 1,780 holes, the board has ample space for most projects.

	On sale! Pololu item #: 1682 Price: $10.95 $15.00 Quantity:
Tamiya 70188 Mini Motor Gearbox (8-Speed) Kit Tamiya’s 8-speed mini motor gearbox features a more compact 030-form-factor brushed DC motor driving a single gear train that can be assembled to have one of eight gear ratios: 7.5:1, 9.5:1, 15.7:1, 19.9:1, 32.9:1, 41.8:1, 79.1:1, or 87.8:1.

	On sale! Pololu item #: 1683 Price: $10.95 $15.00 Quantity:
Tamiya 70190 Mini Motor Multi-Ratio Gearbox (12-Speed) Kit Tamiya’s 12-speed multi-ratio mini motor gearbox features a more compact 030-form-factor brushed DC motor driving a single gear train that can be assembled to have one of twelve gear ratios: 4.6:1, 5.1:1, 9.7:1, 10.8:1, 20.4:1, 22.6:1, 42.8:1, 47.5:1, 89.9:1, 99.8:1, 188.7:1, or 209.7:1.

	On sale! Pololu item #: 1684 Price: $10.95 $15.00 Quantity:
Tamiya 70189 Mini Motor Low-Speed Gearbox (4-Speed) Kit Tamiya’s 4-speed low-speed mini motor gearbox features a more compact 030-form-factor brushed DC motor driving a single gear train that can be assembled to have one of four gear ratios: 71.4:1, 149.9:1, 314.9:1, or 661.2:1. The gear train includes a self-locking worm gear.

	On sale! Pololu item #: 2303 Price: $109.95 $149.95 Quantity:
Concentric LACT2P-12V-20 Linear Actuator with Feedback: 2" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 2-inch stroke and a built-in potentiometer for position feedback.

	On sale! Pololu item #: 2305 Price: $109.95 $149.95 Quantity:
Concentric LACT4P-12V-20 Linear Actuator with Feedback: 4" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 4-inch stroke and a built-in potentiometer for position feedback.

	On sale! Pololu item #: 2307 Price: $109.95 $149.95 Quantity:
Concentric LACT6P-12V-20 Linear Actuator with Feedback: 6" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 6-inch stroke and a built-in potentiometer for position feedback.

	On sale! Pololu item #: 2309 Price: $109.95 $149.95 Quantity:
Concentric LACT8P-12V-20 Linear Actuator with Feedback: 8" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has an 8-inch stroke and a built-in potentiometer for position feedback.

	On sale! Pololu item #: 2311 Price: $109.95 $149.95 Quantity:
Concentric LACT10P-12V-20 Linear Actuator with Feedback: 10" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 10-inch stroke and a built-in potentiometer for position feedback.

	On sale! Pololu item #: 2313 Price: $109.95 $149.95 Quantity:
Concentric LACT12P-12V-20 Linear Actuator with Feedback: 12" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 12-inch stroke and a built-in potentiometer for position feedback.

	On sale! Pololu item #: 2327 Price: $109.95 $149.95 Quantity:
Concentric LACT12P-12V-5 Linear Actuator with Feedback: 12" Stroke, 12V, 1.7"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 5:1 reduction gearbox that gives the actuator a dynamic load rating of 34 lbs (15 kg) and a maximum speed of 1.7 in/s (4.3 cm/s), and it is rated to withstand up to 450 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 12-inch stroke and a built-in potentiometer for position feedback.

	On sale! Pololu item #: 61 Price: $8.95 $12.00 Quantity:
Tamiya 70097 Twin-Motor Gearbox Kit Tamiya’s twin-motor gearbox consists of two independent brushed DC motors and gearboxes in one compact housing, making it perfect for small robots. You can assemble the gearboxes to have a 58:1 or a 204:1 gear ratio.

	On sale! New! Pololu item #: 2196 Price: $13.45 $18.00 Quantity:
Tamiya 70203 Low-Current Motor Gearbox (3-Speed) This gearbox features a low-current brushed DC motor, which is great for projects where you want to keep your power consumption to a minimum. Its single gear train can be assembled to have one of three gear ratios: 12.7:1, 38.2:1, or 114.7:1.

	On sale! Pololu item #: 1272 Price: $14.95 $19.95 Quantity:
L3G4200D 3-Axis Gyro Carrier with Voltage Regulator This sensor is a carrier/breakout board for the ST L3G4200D three-axis gyroscope, which measures the angular rates of rotation about the pitch (x), roll (y), and yaw (z) axes. Angular velocity measurements with a configurable range of ±250°/s, ±500°/s, or ±2000°/s can be read through a digital I²C or SPI interface. The board operates from 2.5–5.5 V and has a 0.1″ pin spacing. Clearance: This board is being replaced by the newer, pin-compatible L3GD20 carrier.

	On sale! Pololu item #: 2304 Price: $89.95 $119.95 Quantity:
Concentric LACT4-12V-20 Linear Actuator: 4" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 4-inch stroke and no potentiometer.

	On sale! Pololu item #: 2306 Price: $89.95 $119.95 Quantity:
Concentric LACT6-12V-20 Linear Actuator: 6" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 6-inch stroke and no potentiometer.

	On sale! Pololu item #: 2308 Price: $89.95 $119.95 Quantity:
Concentric LACT8-12V-20 Linear Actuator: 8" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 8-inch stroke and no potentiometer.

	On sale! Pololu item #: 2310 Price: $89.95 $119.95 Quantity:
Concentric LACT10-12V-20 Linear Actuator: 10" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 10-inch stroke and no potentiometer.

	On sale! Pololu item #: 2312 Price: $89.95 $119.95 Quantity:
Concentric LACT12-12V-20 Linear Actuator: 12" Stroke, 12V, 0.5"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 20:1 reduction gearbox that gives the actuator a dynamic load rating of 110 lbs (50 kg) and a maximum speed of 0.5 in/s (1.3 cm/s), and it is rated to withstand up to 500 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 12-inch stroke and no potentiometer.

	On sale! Pololu item #: 2318 Price: $89.95 $119.95 Quantity:
Concentric LACT4-12V-5 Linear Actuator: 4" Stroke, 12V, 1.7"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 5:1 reduction gearbox that gives the actuator a dynamic load rating of 34 lbs (15 kg) and a maximum speed of 1.7 in/s (4.3 cm/s), and it is rated to withstand up to 450 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 4-inch stroke and no potentiometer.

	On sale! Pololu item #: 2326 Price: $89.95 $119.95 Quantity:
Concentric LACT12-12V-5 Linear Actuator: 12" Stroke, 12V, 1.7"/s This 12 V linear actuator can be used in a variety of heavy-duty applications. The motor has 5:1 reduction gearbox that gives the actuator a dynamic load rating of 34 lbs (15 kg) and a maximum speed of 1.7 in/s (4.3 cm/s), and it is rated to withstand up to 450 lbs when not moving. Limit switches at each end make the actuator easy to control over its full range of motion, and the worm drive ensures that the shaft will hold its position even when unpowered. This version has a 12-inch stroke and no potentiometer.

	On sale! Pololu item #: 68 Price: $8.29 $11.00 Quantity:
Tamiya 70110 4-Speed Crank-Axle Gearbox Kit This gearbox has four possible gear ratios, including the highest gear ratio of Tamiya’s gearbox series, 5402:1. The other options are 126:1, 441:1, and 1543:1. This gearbox also features a worm gear, which locks the output shaft when the motor is not turning.

	On sale! Pololu item #: 1694 Price: $28.50 $37.00 Quantity:
Tamiya 70198 Wall-Hugging Mouse Tamiya’s wall-hugging mouse is a fun and easy-to-build kit that’s great for new robot enthusiasts, and it can serve as a unique, hackable robot chassis for more advanced users. The mouse has no digital electronics; rather, a simple wire bumper along its side directs current to one of two motors to keep the mouse moving along the wall. The mouse features a hard plastic shell and runs on one alkaline AA battery.

	On sale! Pololu item #: 1689 Price: $23.95 $31.00 Quantity:
Tamiya 70195 Wall-Hugging Ladybug Tamiya’s wall-hugging ladybug is a fun and easy-to-build kit that’s great for new robot enthusiasts, and it can serve as a unique, hackable robot chassis for more advanced users. The ladybug has no digital electronics; rather, a simple wire bumper along its side directs current to one of two motors to keep the ladybug moving along the wall. The ladybug features a hard plastic shell and runs on one alkaline AA battery.

	On sale! New! Pololu item #: 2388 Price: $44.95 $58.00 Quantity:
Tamiya 70162 Remote Control Construction Set (tire type) Great for learning the basics of gears and linkages, this Tamiya kit contains all the parts necessary to make a remote controlled chassis with a ping pong ball collecting appendage. The instructions include directions for assembling the kit with either an arm, bucket, or shovel, and they include directions for a ping pong ball collecting competition.

	On sale! New! Pololu item #: 2389 Price: $48.95 $62.00 Quantity:
Tamiya 70170 Remote Control Construction Set (crawler type) Great for learning the basics of gears and linkages, this Tamiya kit contains all the parts necessary to make a remote controlled crawler that picks up ping pong balls. The instructions include directions for assembling the kit with either an arm, bucket, or shovel for collecting ping pong balls.

	On sale! Pololu item #: 74 Price: $13.95 $17.50 Quantity:
Tamiya 72005 6-Speed Gearbox Kit This versatile, high-efficiency gearbox lets you build one of the following gear ratios: 11.6:1, 29.8:1, 76.5:1, 196.7:1, 505.9:1, and 1300.9:1. Whatever your application, chances are that one of the configurations will do the job.

	On sale! Pololu item #: 120 Price: $31.95 $39.95 Quantity:
Pololu Low-Voltage Dual Serial Motor Controller Frustrated by those cheap, low-voltage motors that require too much current? Here’s the answer: a low-voltage motor controller designed specifically for those toy motors. With all of the convenience of the Pololu dual serial motor controllers and the added ability to deliver 5 amps per motor with no minimum motor voltage, this dual serial motor controller has you covered.

	On sale! Pololu item #: 62 Price: $6.50 $8.00 Quantity:
Tamiya 70111 Sports Tire Set (2 tires) The Tamiya 70111 sports tire set contains two attractive racing-style wheels, each 56 mm in diameter and 25 mm wide. These wheels are compatible with all Tamiya gearbox kits.

	On sale! Pololu item #: 76 Price: $31.95 $39.00 Quantity:
Tamiya 75020 Line Tracing Snail Kit The Line Tracing Snail is an excellent, low-cost robot for a new robotics enthusiast that has no previous experience with robots or electronics. All electronics are completely pre-assembled, and mechanical assembly is very straightforward. The snail has two speeds, and for added fun and entertainment, the eye stalks wiggle back and forth as the robot runs.

	On sale! Pololu item #: 726 Price: $24.95 $29.95 Quantity:
Maxbotix LV-MaxSonar-EZ1 Sonar Range Finder MB1010 This compact sonar range finder by Maxbotix detects objects from 0 to 6.45 m (21.2 ft) with a resolution of 2.5 cm (1") for distances beyond 15 cm (6"). Unlike other sonar range finders, the LV-MaxSonar has virtually no dead zone: it can detect even small objects up to and touching the front sensor face! The EZ0, EZ1, EZ2, EZ3, and EZ4 versions have progressively narrower beam angles.

	On sale! Pololu item #: 106 Price: $7.95 $9.50 Quantity:
Tamiya 70100 Track and Wheel Set The Tamiya 70100 Track and Wheel Set allows for a large degree of adjustability and creativity in designing your own robot. The set includes a variety of track lengths, sprockets, and wheels that are compatible with multiple Tamiya products.

	On sale! Pololu item #: 65 Price: $4.10 $4.80 Quantity:
Tamiya 70101 Truck Tire Set (4 tires) The Tamiya 70101 truck tire set contains four 36 mm-diameter wheels with hard, rubber, 16 mm-wide treads. Our small round robot chassis is designed to use a pair of these wheels, which are great for making small robots! (Compatible with the Tamiya gearbox numbers 70093, 70097, 70103, and 70110, 70167, and 70168).

	On sale! Pololu item #: 118 Price: $7.55 $8.75 Quantity:
Tamiya 70167 Single Gearbox (4-Speed) Kit The single gearbox is perfect if you like the gear ratio options of the 70168 double gearbox but need just one motor or added flexibility in positioning multiple output shafts. Available gear ratios are: 12.7:1, 38:1, 115:1, or 344:1.

	On sale! Pololu item #: 70 Price: $15.99 $18.50 Quantity:
Tamiya 72001 Planetary Gearbox Kit The first in Tamiya’s “high efficiency” series, the planetary gearbox features two 4:1 and two 5:1 stages that can be combined in any way you like—you can even combine two kits to get really huge gear ratios. The output is always conveniently on the same axis as the motor shaft. Available gear ratios are 4:1, 5:1, 16:1, 20:1, 25:1, 80:1, 100:1, and 400:1.

	On sale! Pololu item #: 2314 Price: $12.95 $14.93 Quantity:
Mounting Bracket for Concentric LD Linear Actuators This machined aluminum bracket allows the Concentric LD series linear actuators to be mounted to a structure. Complete mounting hardware is included. Two brackets are required for mounting each actuator.

	On sale! Pololu item #: 69 Price: $7.59 $8.75 Quantity:
Tamiya 70103 Universal Gearbox Kit Unlike the other gearboxes in Tamiya’s series, the universal gearbox has a thin metal frame, making it the smallest Tamiya gearbox. The final two gears are metal, making for a tough output. A worm gear allows for the high gear ratio options of 101:1, 269:1, and 719:1.

	On sale! Pololu item #: 1127 Price: $3.45 $3.95 Quantity:
Solarbotics RW2i Wheel (internal set screw) The RW2i rubber wheel features an internal set screw ideal for designs with space constraints. The 1.23-inch diameter wheel by Solarbotics is made for 3 mm diameter output shafts. These wheels are sold individually, NOT in pairs.

	On sale! Pololu item #: 71 Price: $10.95 $12.50 Quantity:
Tamiya 72002 High-Speed Gearbox Kit The high-speed gearbox can be assembled in 11.6:1 and 18:1 gear ratios. This high-efficiency gearbox is therefore suited for very fast vehicles or other fast mechanisms that do not require high torque.

	On sale! Pololu item #: 72 Price: $10.95 $12.50 Quantity:
Tamiya 72003 High-Power Gearbox Kit With possible gear ratios of 41.7:1 and 64.8:1, the high-power gearbox is well-suited for most vehicles that require a balance of speed and torque.

	On sale! Pololu item #: 73 Price: $10.95 $12.50 Quantity:
Tamiya 72004 Worm Gearbox Kit The primary feature of this high-efficiency gear box is a worm gear, which locks the output shaft whenever the motor is not turning. The high gear ratios of 216:1 or 336:1 make this gearbox appropriate for small walking robots, lifting mechanisms, and other applications where high torque is desired.

	On sale! Pololu item #: 723 Price: $26.95 $29.95 Quantity:
Maxbotix LV-MaxSonar-EZ0 Sonar Range Finder MB1000 This compact sonar range finder by Maxbotix detects objects from 0 to 6.45 m (21.2 ft) with a resolution of 2.5 cm (1") for distances beyond 15 cm (6"). Unlike other sonar range finders, the LV-MaxSonar has virtually no dead zone: it can detect even small objects up to and touching the front sensor face! The EZ0, EZ1, EZ2, EZ3, and EZ4 versions have progressively narrower beam angles.

	On sale! Pololu item #: 762 Price: $26.95 $29.95 Quantity:
Dual Chassis Completion Kit for RRC01A This discounted combination of Tamiya’s twin-motor gearbox, ball caster, and truck tires is meant for use with two Pololu round robot chassis.

	On sale! Pololu item #: 792 Price: $26.95 $29.95 Quantity:
Maxbotix LV-MaxSonar-EZ2 Sonar Range Finder MB1020 This compact sonar range finder by Maxbotix detects objects from 0 to 6.45 m (21.2 ft) with a resolution of 2.5 cm (1") for distances beyond 15 cm (6"). Unlike other sonar range finders, the LV-MaxSonar has virtually no dead zone: it can detect even small objects up to and touching the front sensor face! The EZ0, EZ1, EZ2, EZ3, and EZ4 versions have progressively narrower beam angles.

	On sale! Pololu item #: 793 Price: $26.95 $29.95 Quantity:
Maxbotix LV-MaxSonar-EZ3 Sonar Range Finder MB1030 This compact sonar range finder by Maxbotix detects objects from 0 to 6.45 m (21.2 ft) with a resolution of 2.5 cm (1") for distances beyond 15 cm (6"). Unlike other sonar range finders, the LV-MaxSonar has virtually no dead zone: it can detect even small objects up to and touching the front sensor face! The EZ0, EZ1, EZ2, EZ3, and EZ4 versions have progressively narrower beam angles.

	On sale! Pololu item #: 794 Price: $26.95 $29.95 Quantity:
Maxbotix LV-MaxSonar-EZ4 Sonar Range Finder MB1040 This compact sonar range finder by Maxbotix detects objects from 0 to 6.45 m (21.2 ft) with a resolution of 2.5 cm (1") for distances beyond 15 cm (6"). Unlike other sonar range finders, the LV-MaxSonar has virtually no dead zone: it can detect even small objects up to and touching the front sensor face! The EZ0, EZ1, EZ2, EZ3, and EZ4 versions have progressively narrower beam angles.

	On sale! Pololu item #: 1670 Price: $29.65 $32.95 Quantity:
Snap Circuits Jr. 100-in-1 SC-100 Snap Circuits Jr. 100-in-1 includes over 30 plastic parts and over 100 sample projects. The snap-together electronic blocks are mounted on plastic pieces that can be used again and again to form many exciting and educational circuits.

	On sale! Pololu item #: 1674 Price: $35.95 $39.95 Quantity:
Solar Power EDU-8405 The Solar Power kit guides you through 150 activities that show how to transfer solar energy into other forms of energy. With the included parts you can build a solar electric generator, motor, water heater, thermometer, galvanometer and many other devices.

	On sale! Pololu item #: 1671 Price: $58.45 $64.95 Quantity:
Snap Circuits 300-in-1 SC-300 Snap Circuits 300-in-1 includes over 55 plastic parts and over 300 sample projects. The snap-together electronic blocks are mounted on plastic pieces that can be used again and again to form many exciting and educational circuits.

	On sale! Pololu item #: 947 Price: $66.55 $73.95 Quantity:
OWI-535 Robotic Arm Edge Kit The OWI-535 Robotic Arm Edge Kit is a remote-controlled robotic arm kit with five degrees of freedom, a 3.5oz (100g) lifting capacity, and an LED light. Using five motors with gearboxes, the Edge has a 120° wrist motion, a 300° elbow motion, a 180° shoulder motion, a 270° base motion, and a 0-1.77" (0-4.5cm) gripping motion.

	On sale! Pololu item #: 1675 Price: $76.45 $84.95 Quantity:
RC Snap Circuits Rover The RC Snap Circuits Rover is a mobile, radio-controlled Snap Circuits platform. Build the 23 included projects and create many of your own circuits with the ample circuit-building space on top of this four-wheeled chassis. The included manual has projects that explore the fundamentals of circuit design and radio control.

	On sale! Pololu item #: 1672 Price: $88.15 $97.95 Quantity:
Snap Circuits Pro 500-in-1 SC-500 Snap Circuits 500-in-1 includes over 65 plastic parts and over 500 sample projects. The snap-together electronic blocks are mounted on plastic pieces that can be used again and again to form many exciting and educational circuits.

	On sale! Pololu item #: 761 Price: $18.45 $20.50 Quantity:
Single Chassis Completion Kit for RRC01A This discounted combination of Tamiya’s twin-motor gearbox, ball caster, and truck tires is meant for use with one Pololu round robot chassis.

	On sale! Pololu item #: 1657 Price: $83.66 $92.95 Quantity:
Elenco 200-In-One Electronic Project Lab Learn electronics with the Elenco 200-In-One Electronic Project Lab! This kit includes everything you need to get started building your own electronic circuits. Components such as resistors, capacitors, LEDs, ICs and more are securely attached to the electronic lab so you can spend less time searching for components and more time learning how to build that next circuit! This kit requires six AA batteries (not included).

	On sale! Pololu item #: 642 Price: $3.56 $3.95 Quantity:
Solarbotics RW2 Wheel (external set screw) The Solarbotics RW2 is a 1.23-inch diameter rubber wheel for 3 mm diameter output shafts. These wheels are sold individually, NOT in pairs.

	On sale! Pololu item #: 1634 Price: $4.49 $4.95 Quantity:
Alcohol Gas Sensor MQ-3 This semiconductor gas sensor detects the presence of alcohol gas at concentrations from 0.04 mg/L to 4 mg/L, a range suitable for making a breathalyser. The sensor’s simple analog voltage interface requires only one analog input pin from your microcontroller.

	On sale! Pololu item #: 1676 Price: $99.95 $109.95 Quantity:
Deluxe RC Snap Circuits Rover The Deluxe RC Snap Circuits Rover is a mobile, radio-controlled Snap Circuits platform. Build the 63 included projects (including a rover that shoots a disc at the push of a button!) and create many of your own circuits with the ample circuit-building space on top of this four-wheeled chassis. The included manual has projects that explore the fundamentals of circuit design and radio control.

	On sale! Pololu item #: 2132 Price: $12.95 $13.95 Quantity:
DRV8825 Stepper Motor Driver Carrier, High Current (md20a) Clearance: This original version of our DRV8825 stepper motor driver carrier has been replaced by a newer version that can more easily be used as a drop-in replacement for our A4988 stepper motor driver carriers. The only difference is that the newer version connects the sleep and fault lines through a resistor, making it more straightforward to use in very specific situations described in more detail on the product page. Generally speaking, most users should not notice any difference between the two driver versions.

	On sale! Pololu item #: 1699 Price: $54.95 $58.95 Quantity:
Arduino Mega 2560 R3 The Arduino Mega 2560 R3, the successor to the Arduino Mega, is a microcontroller board based on a ATmega2560 AVR microcontroller. It has 70 digital input/output pins (of which 14 can be used as PWM outputs and 16 can be used as analog inputs), a 16 MHz resonator, a USB connection, a power jack, an in-circuit system programming (ICSP) header, and a reset button. The Arduino has an extensive support community, which makes it a very easy way to get started working with embedded electronics.

	On sale! Pololu item #: 66 Price: $5.99 $6.25 Quantity:
Tamiya 70144 Ball Caster Kit (2 casters) Tamiya’s steel-ball caster is a good way to give a “third wheel” to a small robot powered by a differential drive. The kit comes with enough parts to make two casters, either 25 mm or 35 mm in height.

	On sale! Pololu item #: 63 Price: $7.25 $7.50 Quantity:
Tamiya 70145 Narrow Tire Set (2 tires) Use the pair of tires in the Tamiya 70145 narrow tire set for small and medium-sized robots that must make precise movements. With a 58 mm diameter and solid, rounded, 16 mm treads, these wheels will let your robot turn with little friction, even on rough surfaces like carpet. These wheels are compatible with all Tamiya gearbox kits.

	This product has been discontinued.
Free Elektor magazine July/August 2009 Elektor magazine’s first USA Summer Circuits issue is no longer available.

	This product is only available with a coupon. Please see the description below for details.
Free Elektor magazine September 2009 Get a FREE copy of Elektor magazine’s September issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR0909 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

	This product is only available with a coupon. Please see the description below for details.
Free Elektor magazine October 2009 Get a FREE copy of Elektor magazine’s October issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR1009 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

	This product is only available with a coupon. Please see the description below for details.
Free Elektor magazine November 2009 Get a FREE copy of Elektor magazine’s November issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR1109 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

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Free Elektor magazine December 2009 Get a FREE copy of Elektor magazine’s December issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR1209 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

	This product is only available with a coupon. Please see the description below for details.
Free Elektor magazine January 2010 Get a FREE copy of Elektor magazine’s January issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR0110 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

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Free Elektor magazine February 2010 Get a FREE copy of Elektor magazine’s February issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR0210 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

	This product is only available with a coupon. Please see the description below for details.
Free Elektor magazine March 2010 Get a FREE copy of Elektor magazine’s March issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR0310 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

	This product is only available with a coupon. Please see the description below for details.
Free Elektor magazine April 2010 Get a FREE copy of Elektor magazine’s April issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR0410 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

	This product is only available with a coupon. Please see the description below for details.
Free Elektor magazine May 2010 Get a FREE copy of Elektor magazine’s May issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR0510 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

	This product is only available with a coupon. Please see the description below for details.
Free Elektor magazine June 2010 Get a FREE copy of Elektor magazine’s June issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR0610 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

	This product has been discontinued.
Free Elektor magazine July/August 2010 Elektor magazine’s USA Special Projects Edition is no longer available.