Pico W with BME280 sensor

Project for the microprocessor course. This project consists of using the Raspberry Pi Pico W as an MQTT client, which sends the temperature data to an MQTT broker hosted at Thingspeak.

Requirements

Hardware

• sensor BME280.
• OLED 128x64 0.96".
• Raspberry Pi pico W with micropython.
• Protoboard.
• wiring 26 AGW.
• push button.

Software

• python3.
• pipx (recommended) or uv -- needed to install mpremote.
• mpremote.

Connection with protoboard

Fritzing connection scheme

I2C pins:
SDA -> GP4 (pin 6)
SCL -> GP5 (pin 7)

Push button pins:
GP11 (pin 15) and GND (pin 13)

Power out pins:
3.3V -> pin 36
GND -> pin 38

Setup

create a file called config.py at the root of the project with the following values (MQTT related variables are obtained from Thingspeak).

# config.py

wifi_ssid = "Your wifi SSID"
wifi_password = "Your wifi password"
mqtt_username = "Your MQTT username"
mqtt_password = "Your MQTT password"
mqtt_clientId = "Your MQTT client ID"
mqtt_channel_id = 0000000 # Your channel ID
mqtt_write_api_key = ""
mqtt_server = "mqtt3.thingspeak.com"
mqtt_port = 1883

Once you have all the files ready you must connect the Pico W to the computer via USB, so you need to upload the python files and the lib/ folder one by one

An example using the lib/ folder:

mpremote cp -r lib/ :

At the end in Pico W there should be only these files:

And with that, you're ready. Now to test the code, you just have to write mpremote run main.py

NOTE: This image was shot before interruptions implementation. The correct wiring is at top of this document. Is the fritzing one.