aweijnitz / ESP32-C3-SuperMini-MCP4822

SPI DAC Blueprint for ESP32-C3 SuperMini using MCP4822

ESP32-C3-SuperMini with 12-bit MCP4822 DAC

This sketch is a basic blueprint demonstrating how to connect the MCP4822 DAC to an ESP32-C3 Super Mini.

The code is not optimized for speed, but for portability. It should work on any Arduino or ESP32 with SPI pins. For increased speed replace digitalWrite(...) with direct port manipulation to toggle the chip select low/high.

Getting started

• Target device: ESP32-C3 Super Mini
• Board to set in Arduino IDE: ESP32 Dev Board
• MCP4822 Datasheet TIP: See application notes and sample schematics at the end of the sheet. Very useful!

Example output

Scope measuring VoutA and VoutB that are outputting the inverse of each other (this is what the code does).

There is quite a lot of interference because of breadboard and lack of decoupling capacitors.

Troubleshooting

Serial.println not working?

See this thread: https://www.reddit.com/r/esp32/comments/16qaf8u/trouble_reading_serial_output_on_my_esp32c3/