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Built-in project · Seeed XIAO ESP32-C6

XIAO C6 knob

The XIAO ESP32-C3’s knob circuit, pad for pad, on the ESP32-C6: D0 is still A0, though the GPIO under it has changed. The whole build, a Seeed XIAO ESP32-C6 and 3 more parts, runs here in your browser on the firmware below; open it in the editor to change the wiring or the code and run it again.

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The parts retail for about $10.85. On Mokxi they're free.

XIAO C6 knob · Seeed XIAO ESP32-C6live0.000 s 0.00x
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The circuit itself, running here on the simulator. Press what can be pressed; click anything else to open it in the editor.

The code

The firmware exactly as the editor opens it. Change a line there and press Run: it compiles in the browser.

sketch.ino · Seeed XIAO ESP32-C6
// Knob: a potentiometer on D0 sets the brightness of an LED on D10.
//
// D0 is A0, which is GPIO 0 and ADC1 channel 0. The converter is twelve bits,
// 0 to 4095, and at its default 11 dB attenuation full scale is about 3.3 V,
// so the sketch turns the count into millivolts with the supply it knows.

const int KNOB = A0;
const int LED = D10;

unsigned long lastReport = 0;

void setup() {
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
}

void loop() {
  int raw = analogRead(KNOB);
  analogWrite(LED, raw >> 4);

  unsigned long now = millis();
  if (now - lastReport >= 200) {
    lastReport = now;
    long mv = (long)raw * 3300 / 4095;
    Serial.print("D0 ");
    Serial.print(mv);
    Serial.println(" mV");
  }
  delay(10);
}

Parts list

5 parts, plus the jumper wires. They retail for about $10.85; on Mokxi they're free.

How it is wired

5 connections, pin by pin, read from the circuit itself. Each line is one set of pins joined together, by a jumper wire or a breadboard strip.

  • Seeed XIAO ESP32-C6 pin D0; Potentiometer pin 2
  • Ground: Seeed XIAO ESP32-C6 pin GND; Potentiometer pin 3; LED, green pin C
  • Seeed XIAO ESP32-C6 pin 3V3; Potentiometer pin 1
  • Seeed XIAO ESP32-C6 pin D10; Resistor, 220 Ω pin 1
  • Resistor, 220 Ω pin 2; LED, green pin A

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