Introduction: DIY Infrared Transmitter for IPhone, IPod
Create a Infrared transmitter for any portable mp3 device, ie phones, music players etc.
This tutorial is for creating the Infrared transmitter only.
Can be used with iPhone App DSLR.BOT. http://dslrbot.com
Used for controlling Canon EOS, Nikon, Penta and Sony Cameras.
The way this transmitter works is it sends infrared on and off signals from the audio playback coming from your headphone jack. Having saved an audio file with the correct on and off timings, you can play back this audio track through your portable music player and trigger infrared devices.
This transmitter works better with a WAV audio playback, however this has been successfully tested as an MP3 audio track. The WAV track generally produces a clearer signal as they can playback a 38 KHz modulation (Infrared frequency rate), by dividing the frequency between the two stereo channels. 19 KHz for the left channel and an inverse 19KHz signal for the right.
To better illustrate this the left channel will play an on and off signal ..
The right channel will produce the in-between signals for the off time ..
Therefor each channel will take turns producing a infrared signal creating a higher frequency rate, equal to that of an infrared remote control.
The Items needed for this DIY project are ..
1) Infrared LEDs 940 nm 2x
2) 3.5 mm stereo headphone minijack
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Step 1: Prepare the Headphone Jack
The first thing to do is strip the wire ends then twist the ground wires together. The ground wire is usually the wire unprotected by a coloured casing.
Step 2: Attach Infrared LEDs
Connect the two infrared LEDs to the left and right channel.
Make sure the two LEDs are in reverse from one another.
LED 1, + goes to white wire and - goes to red wire.
LED 2, - goes to white wire and + goes to red wire.
You can generally tell the direction of + and - from the direction of the diode inside the clear plastic. As long as the LEDs are opposite from one another the signal should work.
Once this is done bend the LED wires up to prevent the headphone jack wires from slipping loose.
Step 3: Tape the Wires
To clean up, we need to place electrical tape around each of the exposed wires.
What I've done is tape up the Left channel and RIght channel separately and place another tape around the ground wires to prevent any unwanted wires being crossed.
Once this is done you are ready plug it in any portable music player to playback an audio track with infrared timings.