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Add a Coin Slot + Acceptor

Total build cost:

Optical sensor (OPB3849A):  $5

 Resistors:                           $0.50




See video for circuit and how to install.


The part number of the Optical sensor I used is OPB3849A, this is one type of many that will work. The biggest difference with the sensors is the package size and the gap of the IR slot.


NOTE: If you do this mod, you musy  use my image of retropie. Otherwise you risk damaging your Pi.


Why not 3D print this button insert for a coin slot?

Download .stl and .ipt files.
Button Inserts.zip
Compressed archive in ZIP format [312.6 KB]

You can add some features or extra functionality by sacrificing a button with these custom inserts. I printed these on my PrintrBot Simple Metal (which I would reccomend btw).


The first insert will house a switch. The second is a slot for US quaters. The under side of this insert has a flat area to mount a optical sensor to build a working coin acceptor. I will add more photos of this assembly when I get more optical sensors in the mail :)


I included the STL and AutoCAD Inventor 2014 files.

The switch an opening of 0.505" x 0.805" (+/- 0.01"). The quarter insert has an opening of 0.90" x 0.095". Quarter slot is slightly oversized to accound for tolerance issues due to PLA shrinkage and different printers. I am slightly new to 3D printing; accounting for shrinkage and printer accuracy is all over the place for me.


The STL files are in milimeters (mm).

Inserts fit 1.125" button holes.



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