PCF8591 ADC/DAC module (YL-40) with ESP32

Supply 3.3-5 V Bus I2C I2C address 0x48 / 0x49 / 0x4A / 0x4B / 0x4C / 0x4D / 0x4E / 0x4F Measures voltage

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
AOUT	Not wired to the ESP32	—	DAC output (8-bit), optional
AIN0	Not wired to the ESP32	—	Analog input 0. On-board jumpers join a light sensor, thermistor and pot to some inputs
AIN1	Not wired to the ESP32	—
AIN2	Not wired to the ESP32	—
AIN3	Not wired to the ESP32	—
SCL	I2C clock (SCL)	D22
SDA	I2C data (SDA)	D21
GND	Ground	GND
VCC	Power	3V3

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(0x48);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "PCF8591 ADC/DAC module (YL-40) found at 0x48" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Sources

NXP PCF8591 datasheet, Address 1001 A2 A1 A0 (0x48 to 0x4F, module uses 0x48); supply 2.5 to 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.

PCF8591 ADC/DAC module (YL-40) with ESP32

Pins and ESP32 wiring

Starter code (Arduino)

Sources

Try it in 3D in BoardPilot

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