Powering up 3 digit object counter with USB cable

Step 1: In any USB cable(for example, the one you use for charging your phone), there are 4 wires.

Step 2: Use your multimeter to find out which two wires give +5V. One wire should be +5V and the other should be -VE (GND).

Step 3: Connect the +5V wire to +ve point of screw terminal and -ve to – (minus) point of screw terminal.

The object counter can now be used. Likewise, you can power up the infrared transmitter also.

If you are using more than one transmitter and receiver, you can use this type of USB splitter. You can USB splitters with many ports also. 

Check out all the counters