v1.3
- 4 motors and 7 servos OR 6 motors and 3 servos
- 3 additional input only pins
- runs from 5 NiMH AA batteries OR (need to test) 4.5-22v with the addition of voltage regulators (see list of components)
- Qwiic connectors OR two more GPIO pins
- all components are hand-solderable through-hole parts except for the Qwiic connectors which are surface mount
Compatible with 38 pin devkitC ESP32 boards
program with RCMv2
-
An upgrade from the original 3 versions of RCM boards
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Here are smaller and more powerful RCM boards: BYTE and Nibble
- PCBWay link (PCBWay will give me a commission without increasing the price for you). (approximately $5 for 5 boards and manufacturing takes 1-7 days).
- send the gerbers to a PCB manufacturer of your choice (details you may be asked for: min hole: 0.3mm, min track/spacing 6/6mil, 1 oz Cu outer)
Solder by hand to assemble your boards.
| part | links | quantity | notes |
|---|---|---|---|
| RCM V4 circuit board | see options for purchasing above | 1 | |
| ESP32 devkitC 38 pin | digikey or find on Amazon | 1 | |
| L293D | digikey | 2 or 3 | |
| 16 pin IC socket | 0 to 3 | depending on whether you solder the ICs directly and how many motors you want to use | |
| 30k resistor | 1 | ||
| 10k resistor | 1 | ||
| Qwiic connector (JST SH) | digikey | 0 to 2 | |
| 4 male header pins | 1 | for I2C pins | |
| 5 male header pins | 1 | for extra input pins | |
| 4 female header pins | 3 | for motors (can also use one 12 pin strip instead) | |
| 7 male header pins | 4 | for servos | |
| battery wires | 2 male header pins OR 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) |
| esp32 buck 5v 0.6A | Pololu | 0 or 1 | if you want to supply voltages above 7 volts (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!