Posts tagged “new products” (Page 7)

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New product: Dual G2 High-Power Motor Drivers

Posted by Jan on 15 November 2017

We sell a lot of motor drivers, which makes sense since you usually need motors to build robots, and motor drivers tend to be the kind of product you cannot really build yourself on a breadboard. One of our more popular products is the dual VNH5019 shield for the Arduino:

Pololu dual VNH5019 motor driver shield, assembled and connected to an Arduino Uno R3.

That product is based on ST’s massive VNH5019 motor driver chip, which is a successor to the VNH3SP30 driver we initially started selling back in 2005:

Older version of the High-Current Motor Driver Carrier.

When I first heard of the chip (at one of the first LVBots meetings), it seemed like someone must have misremembered the spec since it was inconceivable for a single integrated chip to deliver 30 amps. And to some extent, that was valid—you would have to do a lot of extra thermal management work to get 30 A out of that chip without it overheating. But the chip really could do in excess of 10 A, which was still amazing; the real limitation was in voltage, especially if you tried to use PWM at any moderate frequency. The VNH2SP30 was better about PWM frequency, letting us get to 20 kHz, but it had an upper operating limit of 16 V. The VNH5019 raised this to 24 V, getting us tantalizingly close to the 24V rail many would like to use. The problem is that 24 V is the limit, and we really need to be able to operate higher than that to account for the usual variations in nominally 24V power setups.

As far as I know, there is no integrated circuit that can deliver over ten amps at 24 V nominal (i.e. at least 30 V max); for that kind of power, you need to go to H-bridges with discrete MOSFETs. We have had those as stand-alone products for a while, too. But those still leave you with a lot of wiring to do if you want to drive two motors, which is typically the minimum for a mobile robot. The new product family we just released makes that easy by providing two high-power motor drivers in one Arduino shield-type package:

Pololu Dual G2 High-Power Motor Driver 24v18 Shield for Arduino.

Pololu Dual G2 High-Power Motor Driver 24v14 Shield for Arduino.

As you can see from the pictures, the main difference in these Dual G2 High-Power Motor Driver Shields is in the MOSFETs: the white boards have larger, 5×6mm MOSFETs, and the blue boards have smaller, 3×3mm MOSFETs. These correspond to the two versions of the individual drivers:

Pololu G2 High-Power Motor Driver 24v21 and 24v13.

(The higher-power version on the left has the MOSFETs on the back side of the board.) We also offer each board with 30V and 40V MOSFETs, for four total options. The new dual motor drivers perform similarly to our single-channel G2 units, and like the single channel carriers, all of these dual drivers feature current sensing and an adjustable current limit that could be used to detect and protect against stall conditions. These are the individual performance points:


Dual G2 High-
Power Motor Driver
18v22 Shield

Dual G2 High-
Power Motor Driver
18v18 Shield

Dual G2 High-
Power Motor Driver
24v18 Shield

Dual G2 High-
Power Motor Driver
24v14 Shield
Absolute max
input voltage:
30 V 40 V
Max nominal
battery voltage:
18 V 28 V
Max continuous
current per channel:
22 A 18 A 18 A 14 A
Default active current-
limiting threshold:
60 A 50 A 40 A
Current sense
output:
10 mV/A 20 mV/A

For drivers like these, power (heat) dissipation is generally the limiting factor. The copper area around the MOSFETs on both the white and blue versions of the drivers are about the same, so the lower-current blue units perform better then their smaller single channel G2 counter-parts, while the higher current white drivers do worse than the smaller single channel G2 carriers (which also use four layer PCBs for better performance). The power ratings we provide are the maximums without additional heat sinking or air flow and at room temperature. Please note that the boards will be extremely hot at those maximum currents, and the available current will be lower if the ambient temperature is higher.

Since many Arduino boards do not support higher input voltages, the new dual drivers also incorporate a 1A switching regulator so that a single higher-voltage supply can power the motors and Arduino. We have an Arduino library to help you get up and running quickly. And for those who want to use the board without an Arduino, all of the motor control connections are also brought out to a row of 0.1″ headers on one side of the board.

(And for those of you wanting to use this kind of driver with a Raspberry Pi, we have a Raspberry Pi HAT form-factor version coming soon!)

New product: P-Star 45K50 Mini SV

Posted by David on 9 November 2017
Tags: new products

I am excited to announce our new product, the Pololu P-Star 45K50 Mini SV, which is the second member of our P-Star family of programmable controllers based on the PIC18 microcontrollers from Microchip. The P-Star 45K50 Mini SV features a user-programmable PIC18F45K50 microcontroller (32 KB of flash, 2 KB of RAM, full-speed USB), a USB bootloader, and a switching step-down regulator that allows it to be powered from 5 V to 36 V.

The P-Star 45K50 Mini SV is very similar to the smaller P-Star 25K50 Micro, but is bigger and better, with 11 more I/O pins (for a total of 30), a more capable 5 V regulator, and several other additional features. The table below lists the main differences between the two P-Stars:

P-Star 25K50 Micro (top) and P-Star 45K50 Mini SV (bottom).

P-Star 25K50 Micro P-Star 45K50 Mini SV
Microcontroller: PIC18F25K50 PIC18F45K50
User I/O lines: 19 30
Analog inputs: 14 25
Reset button:   yes
Operating voltage: 5.5 V to 15 V 5 V to 36 V
Regulator type: linear switching step-down
Regulated current:(1) 100 mA 500 mA
Auxiliary 3.3 V regulator:   yes
Dimensions: 1″ × 0.6″ 2.0″ × 0.7″

1 These values are rough approximations for comparison purposes. Available current depends on input voltage, current consumed by the board, ambient conditions, and regulator topology.

Although we have been using PIC microcontrollers since our very first product, these two P-Stars are our first products where the PIC microcontroller can be programmed by the user. You can program the P-Star in C or assembly with the MPLAB X IDE, or you can use Microchip’s new online IDE, MPLAB Xpress. The P-Star User’s Guide has instructions for getting started with those environments.

You can load programs onto the P-Star via its proprietary USB bootloader using our open source software that is available for Windows, Linux, and Mac. The bootloader uses 8 KB of flash memory, leaving 24 KB for the user. Alternatively, an ICSP programmer can erase the bootloader and access the full 32 KB of program memory. (Since the bootloader is not recoverable, we recommend this option only for those who are comfortable programming exclusively with an external programmer.)

Both P-Star boards feature a precision 16 MHz crystal, a USB Micro-B connector, and three user-controllable LEDs. A voltage regulator and power selection circuit allow the board to be powered from either USB or an external voltage source.

P-Star 45K50 Mini SV pinout diagram.

Compared to the popular ATmega32U4 microcontroller, the PIC18F25K50 and PIC18F45K50 have nearly the same performance and memory capacity, but these PICs also have some compelling features that are missing on the AVR. For example, they use the PIC18 architecture, which has two interrupt priority levels: interrupts can be assigned to either level, and a high-priority interrupt routine can run during a low-priority one. This powerful feature is what enables our Maestro servo controllers to generate precise servo signals while still using low-priority interrupts to assist with serial communication and other tasks. Unlike the ATmega32U4, these PICs can operate at full speed down to 2.7 V (though the brown-out reset on the P-Star is activated at 2.85 V by default).

P-Star 45K50 Mini SV, bottom view.

P-Star 45K50 Mini SV on a breadboard, shown with a vertical 5-pin ICSP programming header installed.

The PIC18F25K50 and PIC18F45K50 also feature a 5-bit digital-to-analog converter (DAC), which is a handy feature not available on many 8-bit microcontrollers. We use that DAC to set the stepper motor current limit on our Tic stepper controllers, where the PIC18F25K50 serves as the main processor.

A 3 kHz triangle wave generated by the 5-bit digital-to-analog converter (DAC) on the P-Star 25K50 Micro.

For more information, check out the P-Star 45K50 Mini SV page.

New product: Tic T834 USB Multi-Interface Stepper Motor Controller

Posted by David on 2 November 2017
Tags: new products tic

I am excited to announce our new product, the Tic T834 USB Multi-Interface Stepper Motor Controller. The Tic T834 is the second member of the Tic family of USB stepper motor controllers. It incorporates a TI DRV8834 driver, can operate from 2.5 V to 10.8 V, and can deliver up to approximately 1.5 A per phase without a heat sink or forced air flow.

Like the Tic T825, the Tic T834 makes basic speed or position control of a stepper motor easy, with support for six high-level control interfaces:

  • USB for direct connection to a computer
  • TTL serial operating at 5 V for use with a microcontroller
  • I²C for use with a microcontroller
  • RC hobby servo pulses for use in an RC system
  • Analog voltage for use with a potentiometer or analog joystick
  • Quadrature encoder input for use with a rotary encoder dial, allowing full rotation without limits (not for position feedback)

Tic T825 and T834 USB Multi-Interface Stepper Motor Controllers.

The Tic T834 is available with connectors soldered in or without connectors soldered in.

New 20D gearmotors available with 12 V windings and with long-life carbon brushes

Posted by Ben on 30 October 2017
Tags: new products

We love motors here at Pololu, and we are committed to offering you the best selection so that you can find just the right drive solution for your project. Our latest efforts have gone into expanding our selection of 20D gearmotors to include 12 V versions, which have approximately the same performance at 12 V as our 6 V versions do at 6 V, just with half the current draw. This in turn enables the use of lower-current (and typically lower-cost) motor drivers in applications with access to higher voltages.

Additionally, we noticed that our original 6 V versions do not last as long as we would like in some applications, so we made these new 12 V versions with long-life carbon brushes instead of precious metal brushes, and we released new versions of our 6 V motors with long-life carbon brushes as well. These versions have “CB” in their names, and they can be differentiated from versions with precious metal brushes by their copper-colored terminals.

20D mm metal gearmotor precious metal brushes (left) next to 20D 6V CB and 12V CB long-life carbon brushes.

Please note that making the brushes more robust can just move the failure point to the windings or gears if you try to push the motors too hard, but if you use them around their nominal voltages and keep the continuous load low (under around 20% of the stall torque or 1 kg-cm, whichever is lower), the carbon brushes allow the motors to last several times longer than versions with precious metal brushes.

Changing the brushes does affect the performance in ways beyond lifetime (e.g. the starting voltage is generally a little higher with the carbon brushes), so we are continuing to offer precious metal versions of our 6 V motors for now, but we might phase those out in the future. Please contact us or post a comment below if continued availability of the precious metal versions is important to you.

Currently, only the 6V versions with precious metal brushes are available with a rear motor shaft that can be used to add an encoder, like our magnetic encoder for 20D mm metal gearmotors, but the 6V CB and 12V CB motors should be available with this rear shaft option by the end of November.

With the addition of these new units, our selection of 20D gearmotors now spans nearly fifty options:

Rated
Voltage
Brush Type Stall
Current
@ Rated Voltage
No-Load
Speed
@ Rated Voltage
Approximate
Stall Torque
@ Rated Voltage


Single-Shaft
(Gearbox Only)


Dual-Shaft
(Gearbox & Motor)
12 V long-life
carbon
(CB)
1.6 A 570 RPM 26 oz-in 25:1 12V CB
450 RPM 33 oz-in 31:1 12V CB
225 RPM 58 oz-in 63:1 12V CB
180 RPM 75 oz-in 78:1 12V CB
140 RPM 85 oz-in 100:1 12V CB
110 RPM 110 oz-in 125:1 12V CB
90 RPM 130 oz-in 156:1 12V CB
72 RPM 160 oz-in 195:1 12V CB
57 RPM 200 oz-in 250:1 12V CB
45 RPM 250 oz-in 313:1 12V CB
36 RPM 290 oz-in 391:1 12V CB
29 RPM 350 oz-in 488:1 12V CB
6 V long-life
carbon
(CB)
2.9 A 590 RPM 22 oz-in 25:1 6V CB
470 RPM 28 oz-in 31:1 6V CB
230 RPM 54 oz-in 63:1 6V CB
190 RPM 62 oz-in 78:1 6V CB
150 RPM 72 oz-in 100:1 6V CB
120 RPM 87 oz-in 125:1 6V CB
93 RPM 110 oz-in 156:1 6V CB
75 RPM 130 oz-in 195:1 6V CB
60 RPM 170 oz-in 250:1 6V CB
46 RPM 220 oz-in 313:1 6V CB
37 RPM 260 oz-in 391:1 6V CB
30 RPM 310 oz-in 488:1 6V CB
6 V precious
metal
2.9 A 590 RPM 22 oz-in 25:1 6V 25:1 6V dual-shaft
470 RPM 28 oz-in 31:1 6V 31:1 6V dual-shaft
230 RPM 54 oz-in 63:1 6V 63:1 6V dual-shaft
190 RPM 62 oz-in 78:1 6V 78:1 6V dual-shaft
150 RPM 72 oz-in 100:1 6V 100:1 6V dual-shaft
120 RPM 87 oz-in 125:1 6V 125:1 6V dual-shaft
93 RPM 110 oz-in 156:1 6V 156:1 6V dual-shaft
75 RPM 130 oz-in 195:1 6V 195:1 6V dual-shaft
60 RPM 170 oz-in 250:1 6V 250:1 6V dual-shaft
46 RPM 220 oz-in 313:1 6V 313:1 6V dual-shaft
37 RPM 260 oz-in 391:1 6V 391:1 6V dual-shaft
30 RPM 310 oz-in 488:1 6V 488:1 6V dual-shaft

Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. In order to avoid damaging the gearbox, we recommend keeping continuously applied loads under 50 oz-in (3.5 kg*cm) for the versions with precious metal brushes and under 70 oz-in (5 kg-cm) for the versions with carbon brushes (the ones with “CB” in the name). Stalls can also result in rapid (potentially on the order of a second) thermal damage to the motor windings and brushes, especially for motors like this that can deliver a lot of power for their size; a general recommendation for brushed DC motors is to limit continuous current to approximately 25% of the stall current.

Parallax Boe-Bot Robot Kit - USB

Posted by Ryan on 12 October 2017
Tags: new products

We are now carrying the Parallax Boe-Bot Robot Kit - USB, which incorporates a USB-to-serial adapter into the board, so it does not require a separate serial adapter.

The Boe-Bot Robot Kit is an educational kit complete with parts and a textbook for building and programming your own robot. No previous robotics, electronics, or programming experience is required; the kit does not require soldering.

Free Circuit Cellar magazine October 2017

Posted by Ben on 2 October 2017
Tags: new products

Get a FREE copy of Circuit Cellar magazine’s October 2017 issue issue with your order, while supplies last. To get your free issue, enter the coupon code CIRCUIT1017 to your shopping cart, or click the link. The magazine will add 6 ounces to your order weight when calculating your shipping options.

For back issues and more information, see our free Circuit Cellar magazine offers.

1″ (2.5 cm) and 2″ (5 cm) premium jumper wires and wires with pre-crimped terminals

Posted by Ben on 27 September 2017
Tags: new products

Premium Jumper Wire 60-Piece 6-Color Assortment M-F 2".

Wires with Pre-crimped Terminals 60-Piece 6-Color Assortment M-F 2".

Our popular premium jumper wires and wires with pre-crimped terminals are a convenient way to make quick, neat connections to 0.1″ (2.54 mm) connectors and solderless breadboards, and they are now available in shorter 1″ and 2″ lengths. Each new length is available in three gender combinations (female-female, male-female, and male-male) and seven color combinations:

  • black 10-pack
  • red 10-pack
  • yellow 10-pack
  • green 10-pack
  • blue 10-pack
  • white 10-pack
  • multi-color 60-pack (10 each of all six colors)

Our wires with pre-crimped terminals work with our 0.1″ crimp connector housings to make custom cables with the pin arrangement of your choosing. You can easily make cable harnesses or assemblies that branch from one connector on one side to multiple connectors on the other, and you can also cut off one pre-crimped end and solder the wires directly to components to make swapping connections easy:

The premium jumper wires are just wires with pre-crimped terminals that have 1×1 crimp connector housings already installed over the crimp pins.

You can use the following selection boxes to get to a specific pack of premium jumper wires:

Alternatives available with variations in these parameter(s): gender length color Select variant…

and you can use the following selection boxes to get to a specific pack of wires with pre-crimped terminals:

Alternatives available with variations in these parameter(s): gender length color Select variant…

New track sets and colorful Zumo sprockets

Posted by Ben on 22 September 2017
Tags: new products

Pololu 22T Track Set – Red.

We have replaced our original Pololu track sets with new versions featuring our newer style of spoked Zumo sprockets. The sprockets are available in three colors, and like our original sets, we have two different track lengths to choose from:

Each track is made of a single piece of flexible silicone, and the drive sprockets are designed to work with 3mm D-shafts, such as those on our micro metal gearmotors and most of our mini plastic gearmotors.

Dimensions of the Pololu 22T track set.

Dimensions of the Pololu 30T track set.

Additionally, we are offering sprockets by themselves (without tracks or fasteners) for use as replacements for the black sprockets included with our Zumo robots: you can use the red sprockets to add a splash of color, and you can use the white sprockets for painting (or just leave them white!).

Zumo 32U4 robot with red sprockets.

Zumo 32U4 robot with white sprockets.

Introducing the Tic T825 USB Multi-Interface Stepper Motor Controller

Posted by David on 20 July 2017
Tags: new products tic

I am excited to announce our new product, the Tic T825 USB Multi-Interface Stepper Motor Controller. The Tic makes basic speed or position control of a stepper motor easy, with support for six high-level control interfaces:

  • USB for direct connection to a computer
  • TTL serial operating at 5 V for use with a microcontroller
  • I²C for use with a microcontroller
  • RC hobby servo pulses for use in an RC system
  • Analog voltage for use with a potentiometer or analog joystick
  • Quadrature encoder input for use with a rotary encoder dial, allowing full rotation without limits (not for position feedback)

You can select which of these interfaces you want to use and configure the other settings of the Tic over USB using our free software.

The Status tab of the Pololu Tic Control Center.

The Input and Motor Settings tab of the Pololu Tic Control Center.

The Tic T825 can operate from 8.5 V to 45 V and deliver up to approximately 1.5 A per phase continuously without a heat sink or forced air flow. With a digitally adjustable current limit that can be set over USB, serial, or I²C, you can save power while holding position or increase the motor’s torque while it is moving. The Tic offers six different step resolutions, from full step through 1/32-step (32 microsteps per full step). We designed the Tic’s firmware to be capable of taking up to 50,000 microsteps per second, which lets you use those finer microstepping modes while still keeping a high motor speed. The Tic also supports acceleration and deceleration limiting for smooth movements, and very slow speeds down to 1 step every 200 seconds (or 1 step every 1428 seconds with reduced resolution). The Tic T825 is based on the DRV8825 stepper motor driver IC from Texas Instruments (for which we also have a basic carrier board), and we plan to make other versions of the Tic that are based on different drivers with different performance characteristics.

Tic T825 USB Multi-Interface Stepper Motor Controller, bottom view with dimensions.

The Tic T825 is available with connectors soldered in or without connectors soldered in.

For RC/hobby servos, we have a similar family of products called the Maestro servo controllers. For brushed DC motors, we offer the Simple Motor Controllers and the Jrk Motor Controllers.

New SK9822 LED strips and panels

Posted by David on 16 May 2017
Tags: new products

We’re excited to offer a series of addressable LED strips and addressable LED panels based on the new SK9822 integrated circuit. Like the APA102C, the SK9822 combines an RGB LED and driver into a single 5050-size package, allowing each pixel to be individually controlled using a simple two-wire SPI protocol.

The SK9822 is almost (see the notes below) a drop-in replacement for the APA102C and is better than it in a few ways, most importantly its built-in constant current control. If you’ve ever tried to power a long chain of LED strips and only connected power at one end, you might have noticed that the far end of the LED strip has a lower voltage across its power rails because of resistance in the long power connections. For LED strips based on the APA102C and WS2812B, the lower voltage makes the light dimmer and redder. With the SK9822, voltage drops like that are less likely to have a visible effect as long as the voltage stays above 3.5 V.

The SK9822’s protocol is very similar to that of the APA102C, but it updates the color that is being shown at a different time. If you replace APA102C LEDs with SK9822 LEDs in a low frame-rate application, you might have to update the code you are using to control the LEDs. The latest version of our APA102 Arduino library works with the SK9822 so you can either use it directly or use it as a reference when writing your own code. The colors generated by the SK9822 look different from the colors generated by the APA102C, so we would not recommend mixing the APA102C and the SK9822 in a single project.

We offer six different kinds of SK9822 LED strip with different LED densities and lengths:

We offer SK9822 LED panels in three different sizes:

These new SK9822-based products will replace our older APA102C-based products.

We continue to offer SK6812-based LED strips which also have constant current control but are controlled with a one-wire protocol.

Close up of an SK9822, with the red, green, and blue LEDs on at a low brightness.

An addressable RGB LED strip (APA102C or SK9822) displaying a rainbow animation.

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Silicone Tire Pair for 40×7mm Pololu Wheels
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