PIFace Control & Display Tear Down

30 12 2013

Currently involved  with the rather fun PiNoir & Santa Catcher Challenge one

of the main Components for the Challenge Kit is the PIFace Control & Display


We wanted to know what’s inside and what’s connected to what but unfortunately

the 16×2 LCD is soldered to the main PCB. Fortunately I have a good de-solder tool to hand

and a few minutes latter we had this.



First thing you see is the 16 bit SPI port expander from Microchip MCP23S17




From a set of very close photos I’m taking an educated guess the IR Receiver (SV2)  is a Vishay TSOP 34438.

Take a look at the data sheet and the drawing below to get an idea of how it’s connected..


I’ve done a check over with the multimeter and checked the continuity and values where appropriate and I feel they are

more or less right .. please contact us with any comments or corrections ..cheers


Here’s the Johnny CAD drawing and yes I know I can’t draw !!

PiFace Control and Display.png



5 responses

1 01 2014

Try TinyCAD

1 01 2014

Brian, I used the ink on purpose as it was a quick entry.
Secondly if I was going to use a cad program I would use Eagle as I do have it the purpose here was to inform not to produce a pretty diagram to frame and ignore.
TinyCad is a windows program I’m a Linux shop thanks.

Finally Brian lets see some of your stuff up here even has hand drawings rather than terse 2 word comments…Cheers

31 01 2014
Mike Spivey

Thanks! Really useful information: I can’t understand why the makers don’t publish schematics.

8 04 2014
PiFace Control & Display Tear Down

[…] to use a Raspberry Pi without a keyboard or mouse. Curious to see how this module worked, [John] decided to do a tear down and find […]

8 04 2014

yeah works fine … you need to write specific code for the device to work so it’s not a direct video/keyboard mouse replacement!

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