INA3221 3-channel current + voltage monitor with ESP32

Supply 3.3-5 V Bus I2C I2C address 0x40 / 0x41 / 0x42 / 0x43 Measures current, voltage, power

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
VS	Power	3V3	Pin order differs between boards: check the silkscreen
GND	Ground	GND
SCL	I2C clock (SCL)	D22
SDA	I2C data (SDA)	D21
WAR	Interrupt	D35	Warning alert, open drain. Optional
CRI	Interrupt	VP	Critical alert, open drain. Optional
TC	Not wired to the ESP32	—	Timing control alert. Leave unconnected
PV	Not wired to the ESP32	—	Power valid alert. Leave unconnected
IN1+	Not wired to the ESP32	—	Channel 1 from the supply. Measured circuit only, up to 26 V
IN1-	Not wired to the ESP32	—	Channel 1 to the load
IN2+	Not wired to the ESP32	—	Channel 2 from the supply
IN2-	Not wired to the ESP32	—	Channel 2 to the load
IN3+	Not wired to the ESP32	—	Channel 3 from the supply
IN3-	Not wired to the ESP32	—	Channel 3 to the load

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 ? "INA3221 3-channel current + voltage monitor found at 0x40" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Sources

Texas Instruments INA3221 datasheet, Address pin A0 to GND/VS/SDA/SCL = 0x40/0x41/0x42/0x43
Texas Instruments INA3221 datasheet, Bus voltage 0 to 26 V; shunt range ±163.84 mV

Try it in 3D in BoardPilot

BoardPilot Part data (JSON)

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

INA3221 3-channel current + voltage monitor with ESP32

Pins and ESP32 wiring

Starter code (Arduino)

Sources

Try it in 3D in BoardPilot

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