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).
However, the maximum voltage is up to VDD.
If you control a voltage up to 5V, you can use this.
And ESP32Sx/ESP32Cx core does not have a DAC function.
- X9C102 = 1kOhms
- X9C103 = 10kOhms
- X9C503 = 50kOhms
- X9C104 = 100kOhms
I ported from here.
git clone https://github.com/nopnop2002/esp-idf-x9c103
cd esp-idf-x9c103
idf.py set-target {esp32/esp32s2/esp32s3/esp32c3}
idf.py menuconfig
idf.py flash
| Circuit | X9C | ESP32 | ESP32-S2/S3 | ESP32-C3 | |
|---|---|---|---|---|---|
| INC | -- | GPIO33 | GPIO38 | GPIO3 | |
| U/D | -- | GPIO32 | GPIO33 | GPIO4 | |
| High terminals | Vh/Rh | -- | |||
| Vss | -- | GND | GND | GND | |
| Wiper terminals | Vw/Rw | -- | |||
| Low terminals | Vl/Rl | -- | |||
| CS | -- | GPIO5 | GPIO34 | GPIO5 | |
| Vcc | -- | 5V | 5V | 5V |
You can change it to any pin using menuconfig.
If you connect to Low terminals = Gnd and High terminals = 5V, 0 to 5V is output to Wiper terminals in 99 steps.
See here.