INA219 with ESP32-S3-DevKitC-1

Wiring for the INA219 current + voltage monitor on the ESP32-S3-DevKitC-1 (ESP32-S3, 3.3 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

INA219 pin	Role	ESP32-S3-DevKitC-1 pin	Notes
VCC	Power	3V3
GND	Ground	G
SCL	I2C clock (SCL)	9
SDA	I2C data (SDA)	8
VIN-	Not wired to the board	not connected	To the load. Measured circuit only, up to 26 V
VIN+	Not wired to the board	not connected	From the supply. Measured circuit only, up to 26 V

Check before you power it on

Supply: 3.3 V from the 3V3 pin.
I2C can use almost any pins on the ESP32-S3-DevKitC-1; 8 (SDA) and 9 (SCL) are the defaults. If the part is not found, the wires may be crossed: try Wire.begin with the two exchanged.

Test code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin(8, 9);  // SDA = 8, SCL = 9
  Wire.beginTransmission(0x40);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "INA219 current + voltage monitor found at 0x40" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Arduino board: esp32:esp32:esp32s3. Use the port labelled UART. If uploading does not start, hold BOOT, press and release RESET, then release BOOT.

Questions

Which ESP32-S3-DevKitC-1 pins do I use for the INA219?

VCC → 3V3, GND → G, SCL → 9, SDA → 8.

Does the INA219 work with the ESP32-S3-DevKitC-1 at 3.3 V?

Yes: the INA219 runs at 3.3-5 V and the ESP32-S3-DevKitC-1 uses 3.3 V signals, so no level shifting is needed.

What is the I2C address of the INA219?

0x40 or 0x41 or 0x44 or 0x45. An I2C scan (BoardPilot does it for you) shows which one your module uses.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full ESP32-S3-DevKitC-1 pinout · INA219 current + voltage monitor: all pins and data

The INA219 on other boards

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