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1  Community / Products and Services / Re: Introducing the Pololu Zumo Robot for Arduino on: February 05, 2014, 05:50:41 pm
Pololu has distributors all over the world, so there's a good chance you can find this robot locally.  Here are just a few examples of European resellers that carry it:

http://www.robotshop.com/en/zumo-tracked-robot-kit-arduino-no-motors.html
http://europemodels.eu/p_5809_ZUMO+Robot+Kit+for+Arduino/
http://nodna.de/Zumo-Robot-for-Arduino-with-75-1-motors

You can find a full list of distributors here:

http://www.pololu.com/distributors

- Ben
2  Using Arduino / General Electronics / Re: Powering arduino Pro Mini with 7,4V Lipo battery on: December 16, 2013, 05:25:16 pm
You can use this step-up/step-down voltage regulator to output fixed 3.3 V  through its whole discharge cycle of your battery.
http://www.pololu.com/product/2122
and it will cut off at 2.7V

Hello.

You should not count on this regulator to prevent your LiPo battery from over-discharging.  You can find out more information about this here:

http://forum.pololu.com/viewtopic.php?f=3&t=7917

- Ben
3  Community / Products and Services / Re: Pololu Robotics "Black Friday" sale - $22 Unos, $44 Megas, $66 Yúns on: November 26, 2013, 09:53:21 pm
Hello again.

The sale starts in a few hours, and the full sale details are now available on our Black Friday sale page.  We have some pretty amazing deals on our Arduino shields and select Arduinos:




Happy Thanksgiving!

- Ben
4  Community / Products and Services / Pololu Robotics "Black Friday" sale - $22 Unos, $44 Megas, $66 Yúns on: November 23, 2013, 02:51:47 am


Hello, everyone!

Pololu Robotics and Electronics is having its biggest Black Friday sale yet, discounting hundreds of sensors, actuators, motor controllers, and other robot parts by 30% to 60% and offering an additional 11% to 15% off orders over $100! Buy one Zumo Robot and get one free, save on a 3pi Robot and get a free programmer, and take advantage of great deals on select Arduinos and Arduino shields, Raspberry Pis, mbeds, and m3pis. The first doorbuster deals go live Wednesday, November 27, and the sale runs through Cyber Monday (December 2).

We will be revealing more details, such as a complete list of sale items and discounts, over the next few days.  Keep an eye on  http://www.pololu.com/blackfriday or this thread for updates!

- Ben
5  Community / Products and Services / Re: Introducing the Pololu Zumo Robot for Arduino on: December 12, 2012, 04:23:10 pm
We'd love to hear how it goes!  There are already a few discussions on our forum about the Zumo; please don't hestitate to post with any questions you have.

- Ben
6  Community / Products and Services / Pololu Robotics 12/12/12 Sale, now through the end of the world! on: December 12, 2012, 03:57:37 pm


Happy Holidays from Pololu!

We are excited to celebrate the end of the year (and possibly the world) with our first, and last, 12/12/12 sale.  We have an assortment of products on sale for $12, $24, and $36, and you can get 12% off everything else we carry for orders over $48.  If you missed out on our Black Friday sale or have come to realize you have not yet fully satiated your robotics appetite, here is a second chance for some substantial savings on Arduinos, shields, sensors, motion controllers, motors, and more!  The sale started today and runs until the impending apocalypse—or through December 21st, whichever comes first.

For all the sale details, please visit: http://www.pololu.com/121212

- Ben
7  Community / Products and Services / Re: Introducing the Pololu Zumo Robot for Arduino on: December 12, 2012, 03:10:37 pm
Hi, Michael.

I wouldn't say that it's simple to put together; soldering is required, and there are a few steps where you might wish you had a third hand.  You can see all of the assembly instructions in the user's guide.  Once it's assembled, it should be pretty easy to make it drive around, since it's just a matter of calling the appropriate functions from the Arduino library we provide.  You can make it as complicated as you want by adding additional sensors and hardware.

It should be able to easily carry a canopy and extra electronics.  Mini-sumo robots have a weight limit of 500g (approximately a pound), and I expect it to be able to tolerate at least a few pounds, but that also depends on the motors you choose to use for it.  You'll need more torque to carry more weight, so you might consider the 75:1 or 100:1 HP micro metal gearmotors.

By the way, you might be interested in our 12/12/12 sale, which started today and goes until the end of the world (or through Dec 21, whichever comes first).  We have select items on sale for $12, $24, and $36 (the Zumo and our micro metal gearmotors are sale items), and you can get 12% off everything else.



- Ben
8  Community / Products and Services / Pololu "Black Friday" Sale Starts Thursday - shields, sensors, robots, and more! on: November 20, 2012, 08:38:33 pm


Happy holidays from Pololu!

We at Pololu Robotics are excited to bring Black-Friday savings to the Arduino community!  This year, we are having our biggest sale yet, with huge discounts on dozens of our most popular products.  In all, you can get up to $30 off your entire order in addition to saving up to 60% on dozens of selected products, including our new Zumo robot kit for Arduino, 3pi and m3pi robots, Wixel wireless modules, Maestro Servo Controllers, Simple Motor Controllers, sensors, chassis, actuators, addressable LED strips (great for custom holiday light displays), and much more!  Our Arduino-controllable Zumo robot and motor driver Arduino shields might be of particular interest, but our other sale items can be used in a wide range of Arduino projects, so there should be a little something for everyone (and the discounts off your entire order mean you can save even when getting items that aren't part of the sale).



Our "door-buster" deals include a Zumo robot kit for Arduino for $19.95 (motors are sold separately, but they are on sale as well, at a 37.5% discount).  The Zumo door-buster is limited to the first 50 customers who use the coupon, but we will be selling Zumo robot kits for $29.95 for the full duration of the sale (get more than one and face them off against each other!).


For all the details, including a full list of the items on sale, please visit www.pololu.com/blackfriday

Once again, happy holidays!

- Ben
9  Community / Products and Services / Introducing the Pololu Zumo Robot for Arduino on: November 10, 2012, 12:50:02 am
Hello.

We at Pololu are excited to announce the release of the Zumo Robot Kit for Arduino, a low-profile, Arduino-controlled tracked robot that is small enough to qualify for Mini-Sumo but flexible enough to make your own.  The kit includes a Zumo chassis, a Zumo blade, and our new Zumo Shield for Arduino, which acts as an interface between the Arduino and the chassis.  The shield includes dual motor drivers, a buzzer for making simple sounds and music, and an LSM303DLHC 3-axis accelerometer and magnetometer.



The Zumo Shield is somewhat different in that it sits on the bottom, mounted directly to the chassis, and the Arduino plugs into it face-down. The shield itself offers convenient access to the Arduino reset button, user LED, and Arduino I/O lines, and it features an expansion area in the front for connecting additional sensors (e.g. QTR sensors for edge detection or line following).  For more information, including links to the shield library and user's guide, please see the Zumo Shield product page.  Please don't hesitate to ask if you have any questions, and we welcome your feedback!

 

- Ben
10  Community / Products and Services / Introducing the Pololu Dual MC33926 Motor Driver Shield on: June 08, 2012, 06:32:32 pm
Hello.

We at Pololu are excited to announce the release of the Dual MC33926 Motor Driver Shield for Arduino, an easy way to control two brushed DC motors with an Arduino or Arduino clone.  The shield operates from 5 to 28 V and can deliver a continuous 3 A per motor.  Our Arduino library simplifies interfacing with the shield by providing methods for setting the motor speed and direction, reading the motor current, and checking for motor faults.



This shield is a lower-power, lower-cost alternative to our original Dual VNH5019 Motor Driver Shield, and it offers most of the same features along with a very similar interface.  For more information, including links to the shield library and user's guide, please see the dual MC33926 motor driver shield product page.  Please don't hesitate to ask if you have any questions, and we welcome your feedback!



- Ben
11  Community / Products and Services / Re: Introducing the Pololu Dual VNH5019 Motor Driver Shield on: April 30, 2012, 12:54:16 pm
Hello, FipsJr.

The VNH5019 motor shield connects to digital pins 9 and 10 on the Arduino.  On the Uno, these pins correspond to the hardware PWM outputs of Timer 1, the ATmega328's only 16-bit timer.  This allows for an ultrasonic PWM frequency.  Unfortunately, for some reason, these same pins on the Arduino Mega 2560 correspond to the hardware PWM outputs of Timer 2, which is an 8-bit timer.  This seems like a poor pin-assignment choice given that the Arduino Mega 2560 has four 16-bit timers that could have been assigned to those pins instead, including Timer 1, but maybe there are some other constraints I'm not aware of that led to that decision.

You will not be able to get a 20 kHz PWM from an 8-bit timer, so you will either need to live with hearing the PWM-induced whine from your motors, or you can reassign the motor driver shield's PWM pins to the PWM outputs of a 16-bit timer.  The shield was designed to somewhat easily allow for customized pin assignments, and the shield user's guide explains how to do this.  I suggest you reassign MIPWM to Arduino digital pin 11 and M2PWM to Arduino digital pin 12.  You should also reassign M2EN/DIAG to some unused digital pin because that is assigned to digital pin 12 by default.

If you reassign the driver connections this way, the VNH5019 shield library code should just work after a few small modifications:

1) In DualVNH5019MotorShield::init(), delete or comment out the lines:
#if defined(__AVR_ATmega168__)|| defined(__AVR_ATmega328P__)
#endif

2) In void DualVNH5019MotorShield::setM1Speed(int speed), delete or comment out the lines:
#if defined(__AVR_ATmega168__)|| defined(__AVR_ATmega328P__)
#else
analogWrite(_PWM1,speed * 51 / 80); // default to using analogWrite, mapping 400 to 255
#endif

The only line from that block remaining should be:
OCR1A = speed;

3) Do the same thing for DualVNH5019MotorShield::setM2Speed(int speed), except in this case, the only line remaining should be:
OCR1B = speed;

4) Do the same thing for the setM1Brake() and setM2Brake methods.

Remember to use the constructor that provides the shield pin mappings so that the library knows about the new location for M1EN/DIAG.  Please let me know if you have any questions or run into any trouble getting it to work.

- Ben
12  Community / Products and Services / Pololu Robotics Black Friday Sale Starts Thursday! on: November 18, 2011, 06:59:12 pm


Happy holidays from Pololu!

We at Pololu Robotics are excited to bring Black-Friday savings to the Arduino community!  This year, we are having our biggest sale yet, with huge discounts on dozens of our most popular products.  In all, you can get up to $25 off your entire order in addition to saving up to 60% on dozens of selected products, including the 3pi and m3pi robots, Wixel wireless modules, Maestro Servo Controllers, Simple Motor Controllers, sensors, chassis, actuators, and much more!  Our Wixel and dual motor driver Arduino shields might be of particular interest (both will be available at 50% off), but our other sale items can be used in a wide range of Arduino projects, so hopefully there's a little something for everyone (and the discounts off your entire order mean you can save even when getting items that aren't part of the sale, such as the Arduino Uno or Arduino Mega 2560).

Our "door-buster" deal, limited to the first 50 customers, is once again our 3pi robot for $49.95, but this time a USB AVR programmer is included (a savings of $62 off the retail price).  The 3pi is based on the same microcontroller as the Arduino Uno (the ATmega328P), so it can be programmed from the Arduino IDE using Arduino libraries.

For details, visit www.pololu.com/blackfriday

Once again, happy holidays!

- Ben
13  Community / Products and Services / Introducing the Pololu Dual VNH5019 Motor Driver Shield on: October 29, 2011, 02:41:37 am
Hello.

We at Pololu are happy to present the Dual VNH5019 Motor Driver Shield for Arduino, an easy way to control two high-power, brushed DC motors with an Arduino or Arduino clone.  The shield operates from 5.5 to 24 V and can deliver a continuous 12 A (30 A peak) per motor.  Our Arduino library simplifies interfacing with the shield by providing methods for setting the motor speed and direction, reading the motor current, and checking for motor faults.



The VNH5019, just released by ST, is essentially a more versatile version of the VNH2SP30, so the dual VNH5019 motor shield's performance is similar to Sparkfun's Monster Moto shield, except with several key improvements:

  • Operation up to 24 V (overvoltage protection on the VNH2SP30 can kick in at 16 V).
  • Works with 3 V systems and 5 V systems (logic high threshold is 2.1 V on the VNH5019 compared to 3.25 V on the VNH2SP30).
  • Ability to power the Arduino from the motor shield through a removable jumper.
  • Ability to reconfigure the Arduino pin mappings if the defaults aren't convenient or to disconnect pins you don't want to use (e.g. diagnostic pins).
  • Motor driver pins are also broken out along the left side of the shield for general-purpose use.
  • The power inputs and motor outputs are on the opposite side of the board from the Arduino's USB connector and power jack, and they don't short to the grounded USB connector like on the Monster Moto.
  • Driver PWM pins are connected by default to Timer 1 PWM outputs rather than Timer 0 like on the Monster Moto, so ultrasonic (20 kHz) PMW frequencies can be used for quieter operation (the shield library configures the timer this way)
  • Arduino analog inputs aren't wasted on the driver's digital fault outputs.
  • Terminal blocks, 0.1" male headers, and stackable Arduino headers are included.
  • High-side reverse-voltage protection.

For more information, please see the dual VNH5019 motor driver shield product page.  The motor shield library is available now on github, and a detailed user's guide will be available in the next few days.  Please don't hesitate to ask if you have any questions, and we welcome your feedback!



- Ben
14  Community / Products and Services / Re: Wixel Shield: Make your Arduino Wireless! on: July 19, 2011, 03:31:35 am
I just wish the range was a bit more then 50ft, however maybe they are rating that conservatively?
It's hard to give an exact range because it is affected by a number of variables, including intermediate objects, Wixel orientation (a Wixel sitting flush against a surface might have a slightly different range than if it is a few inches above that surface), and even unit-to-unit variation.  The 50-foot range is meant to be a rough estimate of the range at which a reasonable data rate is still achievable in a typical (somewhat RF-noisy) indoor environment, where the Wixels several rooms apart with a few walls between them.  We tried a pair outside with direct line of sight and were able to achieve good wireless serial communication out to approximately 200 feet, but I don't have any sense for how much this line-of-sight range might vary from unit to unit, so please don't treat this as an official spec.

- Ben
15  Community / Products and Services / Re: Wixel Shield: Make your Arduino Wireless! on: July 18, 2011, 02:16:20 pm
I have heard of people running their AVRs above 8 MHz while supplying under 4.5 V without noticing any problems, though they are technically out of spec and who knows what sorts of weird bugs could appear at inopportune moments!

- Ben
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