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This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 50 V and efficiently reduces it to 12 V. The board measures only 0.7″ × 0.8″ yet delivers typical maximum continuous output currents between 2 A and 3.3 A, depending on the input voltage, which makes it well suited for powering moderate loads like sensors or small motors. An optional enable input can be used to put the regulator in a low-power state with a current draw of 10 µA to 20 µA per volt on VIN. The regulator also features reverse voltage protection and a power-good output that indicates when the regulator cannot adequately maintain the output voltage. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 50 V and efficiently reduces it to 9 V. The board measures only 0.7″ × 0.8″ yet delivers typical maximum continuous output currents between 2.3 A and 3.4 A, depending on the input voltage, which makes it well suited for powering moderate loads like sensors or small motors. An optional enable input can be used to put the regulator in a low-power state with a current draw of 10 µA to 20 µA per volt on VIN. The regulator also features reverse voltage protection and a power-good output that indicates when the regulator cannot adequately maintain the output voltage. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 50 V and efficiently reduces it to 7.5 V. The board measures only 0.7″ × 0.8″ yet delivers typical maximum continuous output currents between 2 A and 3.7 A, depending on the input voltage, which makes it well suited for powering moderate loads like sensors or small motors. An optional enable input can be used to put the regulator in a low-power state with a current draw of 10 µA to 20 µA per volt on VIN. The regulator also features reverse voltage protection and a power-good output that indicates when the regulator cannot adequately maintain the output voltage. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 50 V and efficiently reduces it to 6 V. The board measures only 0.7″ × 0.8″ yet delivers typical maximum continuous output currents between 2 A and 4 A, depending on the input voltage, which makes it well suited for powering moderate loads like sensors or small motors. An optional enable input can be used to put the regulator in a low-power state with a current draw of 10 µA to 20 µA per volt on VIN. The regulator also features reverse voltage protection and a power-good output that indicates when the regulator cannot adequately maintain the output voltage. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 50 V and efficiently reduces it to 5 V. The board measures only 0.7″ × 0.8″ yet delivers typical maximum continuous output currents between 2.5 A and 4 A, depending on the input voltage, which makes it well suited for powering moderate loads like sensors or small motors. An optional enable input can be used to put the regulator in a low-power state with a current draw of 10 µA to 20 µA per volt on VIN. The regulator also features reverse voltage protection and a power-good output that indicates when the regulator cannot adequately maintain the output voltage. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

This small synchronous switching step-down (or buck) regulator takes an input voltage from 4.5 V to 50 V and efficiently reduces it to 3.3 V. The board measures only 0.7″ × 0.8″ yet delivers typical maximum continuous output currents between 3.2 A and 4.5 A, depending on the input voltage, which makes it well suited for powering moderate loads like sensors or small motors. An optional enable input can be used to put the regulator in a low-power state with a current draw of 10 µA to 20 µA per volt on VIN. The regulator also features reverse voltage protection and a power-good output that indicates when the regulator cannot adequately maintain the output voltage. The pins have a 0.1″ spacing, making this board compatible with standard solderless breadboards and perfboards.

This board is a simple carrier of Broadcom’s ±30A ACHS-7123 Hall effect-based linear current sensor, which offers a low-resistance (~0.7 mΩ) current path and electrical isolation up to 3 kV RMS. This version accepts a bidirectional current input with a magnitude up to 30 A and outputs a proportional analog voltage (66 mV/A) centered at 2.5 V with a typical error of ±1.5%. It operates from 4.5 V to 5.5 V and is intended for use in 5 V systems.

This board is a simple carrier of Broadcom’s ±20A ACHS-7122 Hall effect-based linear current sensor, which offers a low-resistance (~0.7 mΩ) current path and electrical isolation up to 3 kV RMS. This version accepts a bidirectional current input with a magnitude up to 20 A and outputs a proportional analog voltage (100 mV/A) centered at 2.5 V with a typical error of ±1.5%. It operates from 4.5 V to 5.5 V and is intended for use in 5 V systems.

This board is a simple carrier of Broadcom’s ±10A ACHS-7121 Hall effect-based linear current sensor, which offers a low-resistance (~0.7 mΩ) current path and electrical isolation up to 3 kV RMS. This version accepts a bidirectional current input with a magnitude up to 10 A and outputs a proportional analog voltage (185 mV/A) centered at 2.5 V with a typical error of ±1.5%. It operates from 4.5 V to 5.5 V and is intended for use in 5 V systems.

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This translucent red plastic case with integrated fan is intended for use with 2x15A, 2x30A, 2x45A, and ST 2x45A RoboClaws. The case serves to protect the RoboClaw while the fan adds cooling, allowing the motor controller to deliver higher continuous currents and sustain peak currents longer.

The A-Star 32U4 Prime LV is a programmable board based on the ATmega32U4 AVR microcontroller and arranged in the common Arduino form factor. The A-Star Prime offers many additional features and improvements over competing products, including superior power management that enables efficient operation from 2 V to 16 V (though it requires at least 3 V at start-up). This configuration of the A-Star 32U4 Prime LV includes microSD support, preinstalled female headers common to many Arduinos, and a removable 8×2 character LCD.

The A-Star 32U4 Prime LV is a programmable board based on the ATmega32U4 AVR microcontroller and arranged in the common Arduino form factor. The A-Star Prime offers many additional features and improvements over competing products, including superior power management that enables efficient operation from 2 V to 16 V (though it requires at least 3 V at start-up). This configuration of the A-Star 32U4 Prime LV includes microSD support and preinstalled female headers common to many Arduinos.

The A-Star 32U4 Prime LV is a programmable board based on the ATmega32U4 AVR microcontroller and arranged in the common Arduino form factor. The A-Star Prime offers many additional features and improvements over competing products, including superior power management that enables efficient operation from 2 V to 16 V (though it requires at least 3 V at start-up). This configuration of the A-Star 32U4 Prime LV has no microSD support and includes preinstalled female headers common to many Arduinos.

The A-Star 32U4 Prime LV is a programmable board based on the ATmega32U4 AVR microcontroller and arranged in the common Arduino form factor. The A-Star Prime offers many additional features and improvements over competing products, including superior power management that enables efficient operation from 2 V to 16 V (though it requires at least 3 V at start-up). This configuration of the A-Star 32U4 Prime LV includes microSD support and does not include any through-hole components; it is intended for those who want to customize the way it is assembled.

The A-Star 32U4 Prime LV is a programmable board based on the ATmega32U4 AVR microcontroller and arranged in the common Arduino form factor. The A-Star Prime offers many additional features and improvements over competing products, including superior power management that enables efficient operation from 2 V to 16 V (though it requires at least 3 V at start-up). This configuration of the A-Star 32U4 Prime LV has no microSD support and does not include any through-hole components; it is intended for those who want to customize the way it is assembled.

Get a FREE copy of Circuit Cellar magazine’s March issue with your order while supplies last. To get your free issue, enter the coupon code CIRCUIT0319 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

Get a FREE copy of Circuit Cellar magazine’s February issue with your order while supplies last. To get your free issue, enter the coupon code CIRCUIT0219 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.

This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features high-performance, low-current QTRX sensors with lenses.

This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.

This powerful step-up/step-down regulator efficiently produces a fixed 24 V output from input voltages between 3 V and 30 V while allowing a typical output current of up to 2 A when the input voltage is close to the output voltage and offering typical efficiencies of 80% to 90%. Its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly, as with batteries that start above but discharge below the regulated voltage.

The Tic T249 USB Multi-Interface Stepper Motor Controller makes basic control of a stepper motor easy, with quick configuration over USB using our free software. The controller supports six control interfaces: USB, TTL serial, I²C, analog voltage (potentiometer), quadrature encoder, and hobby radio control (RC). This version incorporates a Toshiba TB67S249FTG driver with innovative and unique features that include Automatic Gain Control, and it ships with soldered header pins and terminal blocks. It can operate from 10 V to 47 V and can deliver up to approximately 1.8 A per phase without a heat sink or forced air flow (or 4.5 A max with sufficient additional cooling).

The Tic T249 USB Multi-Interface Stepper Motor Controller makes basic control of a stepper motor easy, with quick configuration over USB using our free software. The controller supports six control interfaces: USB, TTL serial, I²C, analog voltage (potentiometer), quadrature encoder, and hobby radio control (RC). This version incorporates a Toshiba TB67S249FTG driver with innovative and unique features that include Automatic Gain Control, and male headers and terminal blocks are included but not soldered. It can operate from 10 V to 47 V and can deliver up to approximately 1.8 A per phase without a heat sink or forced air flow (or 4.5 A max with sufficient additional cooling).

This version of our STSPIN220 Low-Voltage Stepper Motor Driver Carrier ships with male header pins installed, so no soldering is required to use it with an appropriate 16-pin socket or solderless breadboard. Please see the STSPIN220 Low-Voltage Stepper Motor Driver Carrier product page for more information about the driver.

This breakout board for STMicro’s STSPIN220 low-voltage microstepping bipolar stepper motor driver offers microstepping down to 1/256-step and operates from 1.8 V to 10 V, allowing stepper motors to be powered with voltages that are too low for other drivers. It can deliver up to approximately 1.1 A per phase continuously without a heat sink or forced air flow (up to 1.3 A peak). The module has a pinout and interface that are very similar to that of our popular A4988 carriers, so it can be used as a drop-in replacement for those boards in many applications.

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This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features high-performance, low-current QTRX sensors with lenses.

This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features high-performance, low-current QTRX sensors with lenses.

This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.

This reflectance sensor module is designed specifically for use with the Balboa 32U4 balancing robot. It features five IR LED/phototransistor pairs that are great for identifying changes in reflectance on the ground directly underneath the Balboa (like detecting or following a black line on a white background). The sensor array offers dimmable brightness control, and each sensor provides an independent output that can be measured with a digital I/O.

Get a FREE copy of Circuit Cellar magazine’s December issue with your order while supplies last. To get your free issue, enter the coupon code CIRCUIT1218 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.

This version of the FS90 micro servo from FEETECH is specially modified to provide access to the feedback potentiometer through a fourth (green) wire, allowing you to directly measure the position of the output. This extra information enables more complex robotics applications, such as determining when the servo has reached its target, detecting when the output is blocked, or implementing your own higher-level closed-loop position control.

Key specs at 6 V: 0.10 sec/60°, 21 oz-in (1.5 kg-cm), 13 g.

This version of the FS5103B standard servo from FEETECH is specially modified to provide access to the feedback potentiometer through a fourth (green) wire, allowing you to directly measure the position of the output. This extra information enables more complex robotics applications, such as determining when the servo has reached its target, detecting when the output is blocked, or implementing your own higher-level closed-loop position control.

Key specs at 6 V: 0.16 sec/60°, 53 oz-in (3.8 kg-cm), 43 g.

This version of our STSPIN820 Stepper Motor Driver Carrier ships with male header pins installed, so no soldering is required to use it with an appropriate 16-pin socket or solderless breadboard. Please see the STSPIN820 Stepper Motor Driver Carrier product page for more information about the driver.

This version of our TB67S249FTG Stepper Motor Driver Compact Carrier ships with male header pins installed, so no soldering is required to use it with an appropriate 16-pin socket or solderless breadboard. The TB67S249FTG has a wide operating voltage range of 10 V to 47 V, and our carrier board can deliver approximately 1.6 A per phase continuously without a heat sink or forced air flow (up to 4.5 A peak). Please see the TB67S249FTG Stepper Motor Driver Compact Carrier product page for more information about the driver.

This version of our TB67S279FTG Stepper Motor Driver Compact Carrier ships with male header pins installed, so no soldering is required to use it with an appropriate 16-pin socket or solderless breadboard. The TB67S279FTG has a wide operating voltage range of 10 V to 47 V, and our carrier board can deliver approximately 1.1 A per phase continuously without a heat sink or forced air flow (up to 2 A peak). Please see the TB67S279FTG Stepper Motor Driver Compact Carrier product page for more information about the driver.

This miniature single-pole, double-throw (SPDT) momentary switch can be used as a general-purpose micro switch or as a small tactile bump sensor for your robot. The switch body dimension is 12.8 × 6.0 × 6.5 mm, and the lever arm is 13.5 mm long.

This breakout board for STMicro’s STSPIN820 microstepping bipolar stepper motor driver offers microstepping down to 1/256-step and a wide operating range of 7 V to 45 V. It can deliver up to approximately 0.9 A per phase continuously without a heat sink or forced air flow (up to 1.5 A peak). The module has a pinout and interface that are very similar to that of our popular A4988 carriers, so it can be used as a drop-in replacement for those boards in many applications.

The MCP motor controllers from Basicmicro (formerly Ion Motion Control) can control a pair of brushed DC motors using USB serial, TTL serial, RS-232 serial, CAN bus, RC, or analog inputs. Integrated dual quadrature decoders make it easy to create a closed-loop speed control system, and advanced features including internal scripting support and user-configurable I/O make it suitable for standalone applications. This version can supply a continuous 120 A per channel (160 A peak) at voltages from 10 V to 60 V.

The MCP motor controllers from Basicmicro (formerly Ion Motion Control) can control a pair of brushed DC motors using USB serial, TTL serial, RS-232 serial, CAN bus, RC, or analog inputs. Integrated dual quadrature decoders make it easy to create a closed-loop speed control system, and advanced features including internal scripting support and user-configurable I/O make it suitable for standalone applications. This version can supply a continuous 120 A per channel (160 A peak) at voltages from 10 V to 34 V.

The MCP motor controllers from Basicmicro (formerly Ion Motion Control) can control a pair of brushed DC motors using USB serial, TTL serial, RS-232 serial, CAN bus, RC, or analog inputs. Integrated dual quadrature decoders make it easy to create a closed-loop speed control system, and advanced features including internal scripting support and user-configurable I/O make it suitable for standalone applications. This version can supply a continuous 60 A per channel at voltages from 10 V to 60 V.

The MCP motor controllers from Basicmicro (formerly Ion Motion Control) can control a pair of brushed DC motors using USB serial, TTL serial, RS-232 serial, CAN bus, RC, or analog inputs. Integrated dual quadrature decoders make it easy to create a closed-loop speed control system, and advanced features including internal scripting support and user-configurable I/O make it suitable for standalone applications. This version can supply a continuous 60 A per channel at voltages from 10 V to 34 V.

The MCP motor controllers from Basicmicro (formerly Ion Motion Control) can control a pair of brushed DC motors using USB serial, TTL serial, RS-232 serial, CAN bus, RC, or analog inputs. Integrated dual quadrature decoders make it easy to create a closed-loop speed control system, and advanced features including internal scripting support and user-configurable I/O make it suitable for standalone applications. This version can supply a continuous 30 A per channel at voltages from 10 V to 60 V.

The MCP motor controllers from Basicmicro (formerly Ion Motion Control) can control a pair of brushed DC motors using USB serial, TTL serial, RS-232 serial, CAN bus, RC, or analog inputs. Integrated dual quadrature decoders make it easy to create a closed-loop speed control system, and advanced features including internal scripting support and user-configurable I/O make it suitable for standalone applications. This version can supply a continuous 30 A per channel at voltages from 10 V to 34 V.

The RoboClaw motor controllers from Basicmicro (formerly Ion Motion Control) can control a pair of brushed DC motors using USB serial, TTL serial, RC, or analog inputs. Integrated dual quadrature decoders make it easy to create a closed-loop speed control system. This version can supply a continuous 120 A per channel (160 A peak) and operates up to 60 V.

The RoboClaw motor controllers from Basicmicro (formerly Ion Motion Control) can control a pair of brushed DC motors using USB serial, TTL serial, RC, or analog inputs. Integrated dual quadrature decoders make it easy to create a closed-loop speed control system. This version can supply a continuous 60 A per channel (120 A peak) and operates up to 60 V.