More About My IR Emitter Circuit

Pictured here is the general schematic of what the circuit should look like. The two comparator circuits are used to power the red and yellow LEDs, which are used to indicate the presence or absence of IR light. Click below to see it enlarged.

Pictured above is a screen capture of the oscilloscope from the WaveForms software. I was instructed to produce a square wave at 1 kilohertz (kHz), 2.5V amplitude, 2.5V offset, and a 50% duty cycle. This waveform would be used to power the IR emitter circuit. Click below to see the image enlarged.

Now, here is a screen capture of the function generator when observing an infrared signal. When the circuit detects an IR light pulse from a TV remote for example, the oscilloscope identifies these pulses as disturbances in the waveforms. Pressing different buttons on the TV remote would result in different patterns of disturbances. Click below to see the image enlarged.

This is the detailed schematic that I drew and submitted as completion of the IR Emitter circuit. This project was certainly a challenge, and took almost a week to finish. I would not have been able to complete it without the help of my tutor Ryan. Click below to see the image enlarged, along with the schematics for the individual comparator circuits.

The final part of this project consisted of actually building the IR Emitter circuit by combining the two comparator circuits with the yellow and red LED circuits, along with the phototransistor IR detector (the tall black stud towards the top of the circuit). The tall clear stud functions as the infrared light emitter. Click below to see more images of the IR circuit, or to see some of the other circuits I build during the course of this class.