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Built-in project · Seeed XIAO ESP32-S3

XIAO S3 knob

The XIAO knob circuit on the ESP32-S3: D0 is A0 on GPIO 1, and the count is printed as the converter gives it. The whole build, a Seeed XIAO ESP32-S3 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 $13.15. On Mokxi they're free.

XIAO S3 knob · Seeed XIAO ESP32-S3live0.000 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-S3
// Knob: a potentiometer on A0 sets the brightness of an LED on D10.
//
// A0 is GPIO 1, ADC1 channel 0. The converter is twelve bits, 0 to
// 4095, and at its default 12 dB attenuation a real S3 saturates at about
// 3.1 V, so a pot across the 3.3 V rail reads 4095 a little before the end.
// The sketch prints the count it reads.

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

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

void loop() {
  int raw = analogRead(KNOB);
  analogWrite(LED, raw >> 4);
  Serial.print("A0 ");
  Serial.println(raw);
  delay(200);
}

Parts list

5 parts, plus the jumper wires. They retail for about $13.15; 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-S3 pin D0; Potentiometer pin 2
  • Ground: Seeed XIAO ESP32-S3 pin GND; Potentiometer pin 3; LED, green pin C
  • Seeed XIAO ESP32-S3 pin 3V3; Potentiometer pin 1
  • Seeed XIAO ESP32-S3 pin D10; Resistor, 220 Ω pin 1
  • Resistor, 220 Ω pin 2; LED, green pin A

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