Here are the parts you will need.
- LYSOL® Healthy Touch® No-Touch Hand Soap System
- Aruino Uno
- NPN transistor
- 3x 330 Ohm resistors
- 2x 1k-10k Ohm resistors
- 2 7-segment displays
- 24-gauge solid core wire
Disassemble the soap dispenser. There are three screws on the bottom and four screws in the battery compartment. Once you take them out, you should be able to take off the bottom and access the circuit board
Cut off all the wires from the board. Solder some solid core wires to the IR receiver.
Cut the traces for the IR receiver on the back
Now, lets take a look at the schematics.