Three-Wire Digitally Controlled Potentiometer driver for ESP-IDF.
ESP32 has two 8-bit DAC (digital to analog converter) channels, connected to GPIO25 (Channel 1) and GPIO26 (Channel 2).
ESP32S2 has two 8-bit DAC (digital to analog converter) channels, connected to GPIO17 (Channel 1) and GPIO18 (Channel 2).
However, the maximum voltage is up to VDD.
If you control a voltage up to 5V, you can use this.
And ESP32S3/ESP32Cx core does not have a DAC function.
- MCP41010 = Single Digital Potentiometer (10 kOhms)
- MCP41050 = Single Digital Potentiometer (50 kOhms)
- MCP41100 = Single Digital Potentiometer (100 kOhms)
- MCP42010 = Dual Digital Potentiometer (10 kOhms)
- MCP42050 = Dual Digital Potentiometer (50 kOhms)
- MCP42100 = Dual Digital Potentiometer (100 kOhms)
I ported from here.
ESP-IDF V4.4/V5.x.
ESP-IDF V5.0 is required when using ESP32-C2.
ESP-IDF V5.1 is required when using ESP32-C6.
git clone https://github.com/nopnop2002/esp-idf-mcp41010
cd esp-idf-mcp41010
idf.py set-target {esp32/esp32s2/esp32s3/esp32c2/esp32c3/esp32c6}
idf.py menuconfig
idf.py flash
The ESP32 series has three SPI BUSs.
SPI1_HOST is used for communication with Flash memory.
You can use SPI2_HOST and SPI3_HOST freely.
When you use SDSPI(SD Card via SPI), SDSPI uses SPI2_HOST BUS.
When using this module at the same time as SDSPI or other SPI device using SPI2_HOST, it needs to be changed to SPI3_HOST.
When you don't use SDSPI, both SPI2_HOST and SPI3_HOST will work.
Previously it was called HSPI_HOST / VSPI_HOST, but now it is called SPI2_HOST / SPI3_HOST.
| Circuit | MCP | ESP32 | ESP32-S2/S3 | ESP32-C2/C3/C6 | |
|---|---|---|---|---|---|
| CS | -- | GPIO5 | GPIO34 | GPIO1 | |
| SCK | -- | GPIO18 | GPIO36 | GPIO3 | |
| SI | -- | GPIO23 | GPIO35 | GPIO2 | |
| Vss | -- | GND | GND | GND | |
| High terminals | PA0/PA1 | -- | |||
| Wiper terminals | PW0/PW1 | -- | |||
| Low terminals | PB0/PB1 | -- | |||
| Vdd | -- | 3.3V | 3.3V | 3.3V |
You can change it to any pin using menuconfig.
If you connect to Low terminals = Gnd and High terminals = 3.3V, 0 to 3.3V is output to Wiper terminals in 255 steps.
See here.