RCM-Hardware-Nibble

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

Tested with the following types of ESP32 QT Py:

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

Options for purchasing

• 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)

Components

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)

Acknowledgements

• 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!