Infrared Investigator

By Ken Kaarvik

Introduction

Investigate what's coming out of your collection of infrared remote controls. With this program running on your GameBoy Color you should get a good idea of what the modulated signals look like as well as the carrier and it's frequency.

Features

Operation

"A" and "B" buttons - Channel A and Channel B. Turn portion of screen blue and wait for an infrared signal. A different portion of the infrared signal can be captured depending on what settings sample rate and trigger delay are set to.

"Start" button - Fast Channel. Turn portion of screen blue and wait for an infrared signal. A different portion of the infrared signal can be captured depending on what the setting trigger delay is set to. The sample rate is fixed at 1.907 ms and is useful for capturing the carrier. The trigger delay works as above - it waits for a selected number of modulated pulses to pass before recording a waveform (it doesn't wait for this number of carrier cycles to pass).

"Left" and "Right" buttons - Move displayed portion of waveform. Each waveform consists of 2048 samples of which 160 can be viewed on screen. The viewing offset indicates what portion of waveform is being displayed. The displayed portion is moved 8 pixels at a time .

"Select" button - Cycles though parameters (Trigger Delay, Memory Slot, and Sample rate) that can be adjusted using "Up" and "Down" buttons. Hold down "Select" button to position display window to start of waveform.

Notes

Download rom irinvest.zip

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