I’m using the 4 channel relay module from SainSmart ... As you all know, however, I have committed to a building a Raspberry Pi into every room in my house, and I’m using all that extra ...

First, they modified an off-the-shelf bubble machine with a Raspberry Pi and relay module. The Pi can easily trigger the bubbling mechanism by controlling power to the machine using the relay.

With this setup, the Raspberry Pi is used to control and monitor the connected components, which include a capacitive soil moisture sensor, a relay module, a micro submersible mini water pump ...

Today is Pi Day. 3rd month, 14th day. It's not the 314th day of the year; that’s November 10th.