CircuitPython BME280 on a Pico
CircuitPython on a Raspberry Pi Pico: busio.I2C and Adafruit’s adafruit_bme280 read the temperature, humidity and pressure and print them every two seconds. The whole build, a Raspberry Pi Pico and 1 more part, runs here in your browser on the firmware below; open it in the editor to change the wiring or the code and run it again.
Teaching? Assign it to your class in one click.
Beginner Runs in your browser. Free, and no account needed.
The parts retail for about $10. On Mokxi they're free.
The code
The MicroPython code exactly as the editor opens it. Change a line there and press Run: the board runs it on the official MicroPython firmware, with nothing to compile.
# CircuitPython on a Raspberry Pi Pico: a BME280 to the Serial Monitor.
# I2C0 on GP5 (SCL) and GP4 (SDA); Adafruit's adafruit_bme280 library goes
# into lib/ for you.
import board
import busio
import time
from adafruit_bme280 import basic as adafruit_bme280
i2c = busio.I2C(board.GP5, board.GP4)
bme = adafruit_bme280.Adafruit_BME280_I2C(i2c, address=0x76)
while True:
print("%.1f C %.1f %% humidity %.1f hPa" % (bme.temperature, bme.relative_humidity, bme.pressure))
time.sleep(2)
Parts list
2 parts, plus the jumper wires. They retail for about $10; on Mokxi they're free.
How it is wired
4 connections, pin by pin, read from the circuit itself. Each line is one set of pins joined together, by a jumper wire or a breadboard strip.
- Ground: Raspberry Pi Pico pin GND; Pressure, humidity and temperature, BME280 pin GND
- Raspberry Pi Pico pin GP4; Pressure, humidity and temperature, BME280 pin SDA
- Raspberry Pi Pico pin GP5; Pressure, humidity and temperature, BME280 pin SCL
- Raspberry Pi Pico pin 3V3; Pressure, humidity and temperature, BME280 pin VIN
Change it and keep it
Open it in the editor, change the circuit or the code, and keep your version in a free account.