Indoor-outdoor thermometer

Step 1: Make it

What is it?

Use two micro:bits so you can monitor outdoor temperatures remotely.

How it works

• This project uses two different programs, one for the outdoor micro:bit which senses the temperature and transmits it on radio group 23.
• The outdoor micro:bit uses its temperature sensor to measure how hot or cold it is.
• It uses radio to send this temperature reading to the indoor micro:bit.
• When the indoor micro:bit receives a temperature reading from outside, it stores it in a variable called outdoorTemp.
• When you press input button A on the indoor micro:bit, it shows its own current temperature reading on its LED display output.
• When you press button B, it shows the temperature reading from outside that it has stored in the outdoorTemp variable.

What you need

• Two micro:bits
• MakeCode or Python editor
• battery pack
• A waterproof container, such a plastic box

Step 2: Code it

Outdoor sensor and transmitter:

Indoor sensor and receiver:

Step 3: Improve it

• Make the batteries last longer by having the outdoor micro:bit turn its radio off when it’s not in use and sending temperature readings less often.
• Use variables to track the highest and lowest temperatures recorded.
• Calibrate the readings against another thermometer to see if you need to adjust the micro:bit’s temperature.