TSL2561 light sensor with ESP32

Supply 3.3 V Bus I2C I2C address 0x29 / 0x39 / 0x49 Measures light

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
VCC	Power	3V3
GND	Ground	GND
SCL	I2C clock (SCL)	D22
SDA	I2C data (SDA)	D21
INT	Interrupt	D35	Interrupt output, optional
ADDR	Not wired to the ESP32	—	Address select: GND = 0x29, open = 0x39, VCC = 0x49

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)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);  // SDA = GPIO 21, SCL = GPIO 22
  Wire.beginTransmission(0x29);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "TSL2561 light sensor found at 0x29" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Sources

TAOS/ams TSL2560/TSL2561 datasheet, Slave address select: ADDR SEL at GND 0x29, float 0x39, VDD 0x49
TAOS/ams TSL2561 datasheet, Supply 2.7 to 3.6 V

Try it in 3D in BoardPilot

BoardPilot Part data (JSON)

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

TSL2561 light sensor with ESP32

Pins and ESP32 wiring

Starter code (Arduino)

Sources

Try it in 3D in BoardPilot

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