the Raspberry Pi 4 has six SPI controllers, six I2C controllers, and six UARTs – all on its 40-pin header. You can’t make use of all of these at once, but with up to four different connections ...

The rig pictured above works as an Internet connected temperature sensor ... Raspberry Pi I/O pins operate at 3.3V this could connect to the B side, give you the ability to interface with i2c ...

Raspberry Pis and Home Assistant are a match made in heaven. The former is great at sensing the world around it and collecting data, and the latter is amazing at taking in data, making decisions ...