INA226 current + voltage monitor with ESP32

Supply 3.3-5 V Bus I2C I2C address 0x40 / 0x41 / 0x42 / 0x43 / 0x44 / 0x45 / 0x46 / 0x47 / 0x48 / 0x49 / 0x4A / 0x4B / 0x4C / 0x4D / 0x4E / 0x4F Measures current, voltage, power

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
ALE	Interrupt	D35	Alert output, optional
VBS	Not wired to the ESP32	—	Bus voltage sense. Usually linked to IN- on the board
IN-	Not wired to the ESP32	—	To the load. Measured circuit only, up to 36 V
IN+	Not wired to the ESP32	—	From the supply. Measured circuit only, up to 36 V

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(0x40);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "INA226 current + voltage monitor found at 0x40" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Sources

Texas Instruments INA226 datasheet, Serial bus address: A0/A1 select 0x40 to 0x4F
Texas Instruments INA226 datasheet, Bus voltage 0 to 36 V

Try it in 3D in BoardPilot

BoardPilot Part data (JSON)

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

INA226 current + voltage monitor with ESP32

Pins and ESP32 wiring

Starter code (Arduino)

Sources

Try it in 3D in BoardPilot

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