Sixteen LV Digital Inputs 8-Layer Stackable HAT for Raspberry Pi (v3.1) [Discontinued] Brand_Hitaltech Also available in a 10-button

Also available in a 10-button (complete) set

It is completely stand-alone and just needs a 3 to 5

Please note you cannot use an Arduino UNO to drive this size

Works with any servo code

Ok - to be honest we don't do much cake baking

Sixteen LV Digital Inputs 8-Layer Stackable HAT for Raspberry Pi (v3.1) [Discontinued] Brand_Hitaltech Also available in a 10-buttonRaspberry Pi can read 26 Input signals through the GPIO header, but sometimes you might need to read more. Since all GPIO pins are wired directly to the local processor, some hardware is required to connect them to the real world. This card has sixteen optically isolated Digital Inputs. Input ranges can be jumper selected for each channel, from 3 volts to 48 volts. Digital Inputs can read both DC and AC signals. The card communicates with Raspberry Pi