ADS1115 16-bit ADC with ESP32

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

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
VDD	Power	3V3
GND	Ground	GND
SCL	I2C clock (SCL)	D22
SDA	I2C data (SDA)	D21
ADDR	Not wired to the ESP32	—	Address select: GND 0x48, VDD 0x49, SDA 0x4A, SCL 0x4B
ALRT	Interrupt	D35	Alert / ready output, optional
A0	Not wired to the ESP32	—	Analog input. Never above VDD
A1	Not wired to the ESP32	—	Analog input
A2	Not wired to the ESP32	—	Analog input
A3	Not wired to the ESP32	—	Analog input

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 ? "ADS1115 16-bit ADC found at 0x48" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Sources

Texas Instruments ADS111x datasheet, ADDR pin connection and corresponding slave address (0x48 to 0x4B)

Try it in 3D in BoardPilot

BoardPilot Part data (JSON)

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

ADS1115 16-bit ADC with ESP32

Pins and ESP32 wiring

Starter code (Arduino)

Sources

Try it in 3D in BoardPilot

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