BMP280 with ESP32-S3-DevKitC-1

Wiring for the GY-BMP280 pressure + temperature 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

BMP280 pin	Role	ESP32-S3-DevKitC-1 pin	Notes
VCC	Power	3V3
GND	Ground	G
SCL	I2C clock (SCL)	9
SDA	I2C data (SDA)	8
CSB	Not wired to the board	not connected	Chip select. Leave unconnected (pulled HIGH on the board) to use I2C
SDO	Not wired to the board	not connected	Address select: LOW = 0x76, HIGH = 0x77. Most boards default to 0x76

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.
To make sure it is the real chip, read register 0xD0: a genuine part answers 0x58.

Test code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin(8, 9);  // SDA = 8, SCL = 9
  Wire.beginTransmission(0x76);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "GY-BMP280 pressure + temperature found at 0x76" : "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 BMP280?

VCC → 3V3, GND → G, SCL → 9, SDA → 8.

Does the BMP280 work with the ESP32-S3-DevKitC-1 at 3.3 V?

Yes: the BMP280 runs at 3.3 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 BMP280?

0x76 or 0x77. 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 · GY-BMP280 pressure + temperature: all pins and data

The BMP280 on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Nano Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico Teensy 4.1

Other parts on the ESP32-S3-DevKitC-1

BME280 DHT22 DHT11 HC-SR04 SSD1306 OLED MPU6050 DS18B20 WS2812B LED strip SG90 servo Relay module HC-SR501 PIR LCD 1602 I2C INA219 VL53L0X BH1750 MAX30102 RC522 RFID NEO-6M GPS Capacitive soil moisture sensor ADS1115 TM1637 28BYJ-48 stepper L298N Potentiometer Push button LED Joystick module SD card module AHT20