Weather Sensor

The BME 280 weather sensor can read temperature, pressure and humidity.

Wiring

Use the I2C cable to connect the sensor. This has 4 wires in 2 pairs: orange-yellow and red-black:

Wire up as follows, using the Edge Connector or Motor Controller board:

Weather Sensor	Wire colour	Edge Connector	Motor Controller
VIN	Red	3V3	V
GND	Black	GND	G
SCL	Yellow	SCL	C
SDA	Orange	SDA	D

On the edge connector it should look like this:

On the motor controller it should look like this:

If you are using the Adafruit weather sensor, the wiring is a little different:

Adafruit Weather Sensor	Wire colour	Edge Connector	Motor Controller
VIN	Red	3V3	V
GND	Black	GND	G
SCK	Yellow	SCL	C
SDI	Orange	SDA	D

Coding

You will need to add an extension to get additional blocks for the sensor. Click on the extensions block:

Then search for "bme280":

Then click on the BME280 extension:

You should see a new block appear:

Enter this code:

If you are using the Adafruit sensor, set the address to 0x77.

Download the code to the microbit.

To see the data, click on Show data Device:

You should see some numbers and a graph. These show the temperature, humidity and pressure. Warm the sensor in your hands to see the temperature change. Breathing on it should increase the humidity.