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to GND will register in software with a value of 1. The inputs have software switchable pull up
resistors to 3V3.
When configured as outputs, 20mA per pin is available.
5V supply terminals
PiFace™ Relay+ has a pair of screw terminals for power, which can be used to power the board
and the Raspberry Pi®. Alternatively these terminals can be used to supply 5V to your circuit
(subject to limits of the power supply), taken from the Raspberry Pi®'s 5V power rail. Check the
power jumper section for more information.
Jumper settings
Address jumpers
PiFace™ Relay+ has three address jumpers (JP1-3) to individually identify each board when
stacked. With three jumpers you can address up to eight boards.
By default, a single board should have the address 000. This address is set by connecting pins 1
and 2 each of JP1, JP2 and JP3 as indicated by the white line printed next to each jumper. Other
addresses are shown in the table below.
Address
0
1
Binary Address
JP3 position
000
1-2
001
1-2
JP2
JP1
1-2
1-2
1-2
2-3
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