Author Archives: Ryan

Parallax Boe-Bot Robot Kit – USB

via Pololu Blog

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.

Aerial photography kite rig

via Pololu Blog

Pololu customer Yvon Hache made this 3D-printed aerial photography rig that he shared in a forum post. The rig, trailing 100 feet below the kite, automatically triggers a camera to take pictures at three tilt angles and sixteen pan angles. It incorporates an ARM Cortex-M4 microcontroller from Texas Instruments (32-bit, 80 MHz, TM4C123GH6PZ), an AltIMU-10 v5, Pololu voltage regulators, and a Zigbee module for wireless remote control. Yvon uses a pair of Pololu micro metal gearmotor extended brackets per motor—one mounts the motor to the frame and the other protects the encoder assembly.

More kite rig information and pictures can be found on Yvon’s website.

Zumo 32U4 Robot for RoboFest’s RoboHit competition

via Pololu Blog

We were excited to hear from the NCA Lights high school student robotics team about their recent entry in the RoboFest Michigan Championship 2017 RoboHit competition. RoboFest is a series of robotics events and competitions organized by Lawrenece Technological University. This year’s baseball-themed competition, “RoboHit”, involved hitting a ping pong ball off of a water bottle with a pencil and circling the outer edge of the arena (base running).

The NCA Lights used a Zumo 32U4 Robot Kit and two 50:1 Micro Metal Gearmotors HPCB 6V with Extended Motor Shaft as the base of their robot.

Open-source myoelectric hand prosthesis

via Pololu Blog

Pololu customer Alvaro Villoslada made this impressive open-source 3D-printable hand prothesis. Each finger uses a 1000:1 Micro Metal Gearmotor HP 6V with Extended Motor Shaft to wind a fishing line—acting as a tendon—onto a spool. A magnetic encoder attached to each motor enables closed-loop control, and the motors are driven by DRV8838 DC motor driver carriers. An RC hobby servo controls the thumb position. Alvaro uses a Teensy 3.1 microcontroller to monitor the encoders and control the actuators, and he built a user interface in Python for controlling the hand from a computer.

For CAD files, detailed instructions and more pictures and videos, see the Hackaday project page.

Guide utilisateur du Robot Zumo Pololu

via Pololu Blog

MCHobby, a Pololu distributor, translated the Pololu Zumo Shield for Arduino User’s Guide to French as the Guide utilisateur du Robot Zumo Pololu (2MB pdf)! They describe it in French as “Un guide complet pour assembler, utiliser et exploiter rapidement votre Robot Zumo (version 0.1)”. If you’d like to see more translations like this, please let them you know that you enjoyed it and support them by buying from their shop.

Sanyo pancake stepper motors with encoders

via Pololu Blog

We are now offering two new NEMA 17-size pancake bipolar stepper motors from Sanyo, each featuring an integrated high-resolution quadrature encoder and home channel for absolute positioning.

Stepper motor Steps per revolution Current rating (per coil) Voltage rating Resistance (per coil) Holding torque
#2279 42×31.5mm 200 1 A 5.4 V 5.4 Ω 1.9 kg-cm (26 oz-in)
#2278 42×24.5mm 200 1 A 3.5 V 3.5 Ω 800 g-cm (12 oz-in)

Side view of the SS2422-50XE100 42×31.5mm Sanyo pancake stepper motor.

Side view of the SS2421-50XE100 42×24.5mm Sanyo pancake stepper motor.

The integrated quadrature encoder operates from 5 V and has a resolution of 1000 P/R, which allows for 4000 counts per revolution (CPR) of the output shaft when counting both edges (i.e. rising and falling) of both channels (i.e. A and B). In addition to the A and B channel outputs, the encoder has a home channel, Z, that pulses once per revolution and can be used for absolute positioning. The encoder also has outputs for the inverse of A, B, and Z. A 15 cm (6″) encoder cable is included.