Mini IR Theremin Circuit

Posted on Feb 6, 2014

The IR Theremin hardware schematic is deliciously simple in that the main input and output devices do not require many connections. This is usually a mixed blessing because less hardware, often means more software. The main devices used in the circuit are the 18F452, 2Y0A21/GP2D120 IR Sensor and the headphone speaker. The power circuit here is

Mini IR Theremin Circuit
Click here to download the full size of the above Circuit.

just batteries. No voltage regulator was used because the batteries I have are all +1. 2v, so 4 AA Batteries x +1. 2v = +4. 8v which is within specification with the PIC and IR sensor. The IR Sensor only has three connections: Power, Ground and Output to the PIC`s pin 2 (RA0). This is set as an analog input for the A-to-D converter in the PIC. The connection to the speaker is one side going directly to ground and the other side of the speaker connecting to the PIC`s pin 19 (RD0). The firmware will tell this pin to alternate between on and off at certain frequencies to create the proper pitch output to the speaker.

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