BoardPilotKY-039 finger heartbeat sensor with ESP32
Supply 3.3-5 V
Bus ANALOG
Measures heart rate
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| S | Analog output | D34 | Very small signal that changes with each heartbeat. To an ADC1 pin (GPIO 32 to 39) |
| VCC | Power | 3V3 | Middle pin. Use 3V3 |
| GND | Ground | GND | Marked - on the board |
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); }
void loop() {
int mv = analogReadMilliVolts(34); // S on GPIO 34
Serial.println(mv);
delay(200);
}Sources
- Joy-IT KY-039 datasheet, IR LED and phototransistor through the finger; pins S, +, -. Signal is weak and noisy
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.