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RCM-hardware-D1

v1.0

  • 1.75 by 1.575 inches, 44.45 by 40.0 millimeters
  • 2 motors (one L293D)
  • 2 servos OR qwiic connector
  • Qwiic-Compatible
  • runs on 4 NiMH AAs
  • battery monitoring
  • uses a Wemos D1 mini with esp8266 CPU

The goal of this project is to make the cheapest RCM board.

Program with RCMv2

The RCM D1 uses a Wemos D1 mini v4.0.0 esp8266 board.

Use the AVR versions of JMotor functions not the ESP32 versions.

Options for purchasing

  • PCBWay link
  • send the gerbers to a PCB manufacturer of your choice

Components

Solder by hand to assemble your boards.

part links quantity notes
RCM D1 circuit board see options for purchasing above 1
Wemos D1 mini with esp8266 link 1
L293D digikey 1
16 pin IC socket 1 optional
18k resistor digikey 1 R1
10k resistor digikey 1 R2
47uF capacitor digikey 1
Qwiic connector (JST SH) digikey 1 optional, for qwiic connector
2x3 male header pins 1 for servos
2 female header pins 2 for motors
8 female header pins 2 often included with the wemos D1
8 male header pins 2 often included with the wemos D1
battery wires JST RCY or battery plug of your choice 1

photo of assembled board

Acknowledgements

The RCM D1 was originally created for PNW Assistive Technology's RC car project

Thanks for the WemosD1 Kicad footprints! https://github.com/rubienr/wemos-d1-mini-kicad

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cost optimized Robot Control Module for small wifi controlled robots

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