codesqueak / pi_pico_bme280

A demonstration project on how to talk to a device on the I2C bus. This uses microPython on the Pi Pico with a BME280 Temperature Humidity Pressure Sensor

Raspberry Pi Pico with BME280 Sensor

A small project to demonstrate how to talk to a device on the I2C bus without third party libraries. This uses microPython on the Pi Pico with a BME280 Sensor.

The BME280 is an environmental sensor capable of measuring temperature, pressure and humidity

Setup

Attach the sensor to the Pi Pico as shown below

Pi Pico	Pin	BME280
GP0	1	SDA
GP1	2	SCL
GND	3	GND
3V3(OUT)	4	2-6V

Code

The code is in a style to aid understanding rather than being production ready. For example:

• The calculations are presented as close to the examples in the datasheet as possible
• Constant values are re-read on each run instead of being stored
• No checks for sensor existence or readiness are included
• Lots of output !

Example Output

i2c devices found at
0x76

Sensor data

0x88: 66 6F B8 69 32 00 B0 92 
0x90: BA D6 D0 0B F1 19 DC FF 
0x98: F9 FF AC 26 0A D8 BD 10 
0xa0: 00 4B 79 00 00 00 00 00 
0xa8: 00 00 00 00 33 00 00 C0 
0xb0: 00 54 00 00 00 00 60 02 
0xb8: 00 01 FF FF 1F 4E 08 00 
0xc0: 00 40 6F FF 00 00 00 00 
0xc8: 03 00 00 00 00 00 00 00 
0xd0: 60 00 00 00 00 00 00 00 
0xd8: 00 00 00 00 00 00 00 00 
0xe0: 00 74 01 00 12 28 03 1E 
0xe8: 00 41 FF FF FF FF FF FF 
0xf0: FF 00 03 0C 6F 00 00 55 
0xf8: EE 40 82 2F 80 6A E1 80 

Temperature is 24.43 degrees
Pressure is 980.704 mbar
Humidity is 47.62598 %

Useful Links

The BME280 sensor used

Bosch datasheet for the sensor

Coffee

If you find this project useful, you may want to Buy me a Coffee! ☕ Thanks 👍