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Cup anemometer (reed switch) with ESP32

Supply 3.3 V Bus GPIO Measures wind speed
12

Pins and ESP32 wiring

PinRoleESP32 pinNotes
1Output (the part drives it)D25To a GPIO with INPUT_PULLUP. 1 closure per second = 2.4 km/h
2GroundGND

Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.

Starter code (Arduino)

void setup() {
  Serial.begin(115200);
  pinMode(25, INPUT);  // 1
}

void loop() {
  Serial.println(digitalRead(25));
  delay(100);
}

Sources

Try it in 3D in BoardPilot

BoardPilot Part data (JSON)

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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.