BMP280 with Teensy 4.1

Wiring for the GY-BMP280 pressure + temperature on the Teensy 4.1 (MIMXRT1062DVJ6B, 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	Teensy 4.1 pin	Notes
VCC	Power	3V
GND	Ground	G
SCL	I2C clock (SCL)	19 (GPIO_AD_B1_00)
SDA	I2C data (SDA)	18 (GPIO_AD_B1_01)
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 3V pin.
I2C uses the board’s default pins 18 (SDA) and 19 (SCL). Most modules include pull-up resistors; if the part is not found, check them and swap-test SDA/SCL.
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();  // SDA = 18, SCL = 19 (the board's default I2C pins)
  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: teensy:avr:teensy41. Press the white program button once if the upload waits for the board.

Questions

Which Teensy 4.1 pins do I use for the BMP280?

VCC → 3V, GND → G, SCL → 19 (GPIO_AD_B1_00), SDA → 18 (GPIO_AD_B1_01).

Does the BMP280 work with the Teensy 4.1 at 3.3 V?

Yes: the BMP280 runs at 3.3 V and the Teensy 4.1 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 Teensy 4.1 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 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico

Other parts on the Teensy 4.1

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