v1.8
Half a BYTE
- 1.08 by 1.12 inches, 27.432 by 28.448 millimeters
- 4 motors
- 4 servos
- 2 additional GPIO pins
- built-in IMU
- battery monitoring
- I2C connector on QT PY
- runs on 3-11 volts
program with RCMv2
| Type of QT Py | PlatformIO name | link to Adafruit |
|---|---|---|
| S3 with 2MB PSRAM | adafruit_qtpy_esp32s3_n4r2 | https://www.adafruit.com/product/5700 |
| S3 with 8Mb Flash | adafruit_qtpy_esp32s3_nopsram | https://www.adafruit.com/product/5426 |
| S2 | adafruit_qtpy_esp32s2 | https://www.adafruit.com/product/5325 |
Look here for how to program it: https://github.com/RCMgames/RCMv2
Look here for more information and examples of robots: https://github.com/rcmgames
Want slightly larger and 8 motors and 8 servos? Look at the BYTE
- PCBWay link (PCBWay will give me a commission without increasing the price for you). (approximately $110 for 2 boards and manufacturing took a month).
- send the gerbers, bill of materials, and ComponentPlacement files (in /PCBproduction-RCM-Nibble) to a PCB manufacturer of your choice (details you may be asked for: min hole 0.25mm, min track/spacing 5/5mil, thickness 1.0mm, 1 oz Cu outer 1.5 oz Cu inner, tell them to not solder the icm20948's exposed pad)
Solder by hand to complete the assembly of your boards.
| part | links | quantity | notes |
|---|---|---|---|
| RCM Nibble circuit board | options for purchasing | 1 | |
| ESP32 QT Py | compatible QT Py | 1 | |
| 2x4 female header pins | this or 2 strips of 4 | 1 | for motors |
| 7 female header pins | 2 | for QT Py | |
| 3 male header pins | 4 | for servos | |
| 2 male header pins | 2 | for extra GPIO pins | |
| battery wires | JST RCY OR 9V battery snap | 1 | Amazon JST RCY |
| servo buck boost 5v 2A | Pololu | 0 or 1 | if you want to supply voltages above or below what servos can accept (supplies other than 5AAs) |
- I would like to thank PCBWay for sponsoring prototyping runs of this project. PCBWay produces very nice boards, supports open source hardware, and gave me great support as I worked on this project. Special thanks to Liam!