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 ...

Sequent Microsystems’ "Eight 24-bit ADC 8-layer Stackable HAT" is a Raspberry Pi expansion board designed for home automation ...

The Raspberry Pi ... I2C, CSI/DSI, and SPI connections. As such, you’ve got a lot more choices in building your home monitoring setup. For a low-end, inexpensive setup, you can interface a ...