Step-by-step guide on designing and programming a custom I2C slave sensor device using Arduino.

And by using a second BBC micro:bit, we can get the readings before heading outside. First, we need a DHT11 sensor, and to check whether it works using one micro:bit.

The code provided by [Shyam] reads the humidity and temperature data from the DHT11 sensor, and “writes” it to the Blynk service.