3.5mm Jack Ir Remote - Page 1
Forum section: electronics / beginners

author: D_K99
author_rank: Newbie
timestamp: February 18, 2016, 09:46:00 pm
content: Hello Guys,I want to build an IR Remote, that connects to your Smartphone via the headphone jack. I thought it would be a simple project by connecting an IR Led to the wires of a Jack, but it wasn't working. I turned the volume up and downloaded a siganlgenerator app, so I can change the signal and the frequency. But nothing worked. So can someone please say what the best waveform and what the best frequency is? Or do I need special low current Led's. (I know you can't see IR so I looked at them through a camera, and I tested the led's with a battery and they worked)

author: Skimask
author_rank: Super Contributor
timestamp: February 18, 2016, 09:52:58 pm
content: How about a schematic?How about a bit of a reference as to what 'signal generator' and what sort of 'waveform' and 'frequency' you used?How about a bit more information?

author: Maxlor
author_rank: Frequent Contributor
timestamp: February 18, 2016, 10:02:45 pm
content: Quote from: D_K99 on February 18, 2016, 09:46:00 pmWhat you did won't work for two reasons. First, if you want to interface with existing equipment, you'll need to generate an 38kHz carrier onto which you modulate your signal. 38kHz is not something you can generate with your phone's audio output, unfortunately.Second, the voltage on your audio out will be a few hundred mV at best, so you won't be able to even light up the LED. The available power is rather low as well, so even if you upconvert the voltage, your range will be in the cm rather than meters.What you need to do is add a microcontroller (or at least a timer) that generates the carrier frequency and modulates it, and an additional power source, and then you can use the audio output as a mere communication interface. You could forgo the power source if you used energy harvesting techniques to store and save up the bit of energy you get from the audio port, but I'm thinking that might be something you should investigate at some later time.

author: Pavle
author_rank: Contributor
timestamp: February 18, 2016, 10:08:12 pm
content: You can make IR remote for android with 2 IR Leds and stereo audio jack:http://www.instructables.com/id/DIY-Infrared-transmitter-for-iPhone-iPod/And you must set volume to the max on android and inside Zaza remote app: uncheck auto recognoze device,select SMART ZAZA and in advanced settings set Zaza max volume to 100%If that does not work you can make other ir remote from here:http://everycircuit.com/list/keywords/ir%20remote

author: mstoer
author_rank: Contributor
timestamp: February 18, 2016, 10:14:05 pm
content: I am am guessing you might want a TV remote? I 'built' a IR remote for my smartphone to trigger my Canon camera. I say 'built', but really it was just soldering two IR LEDs together on a jack. It worked fine (using the DSLR Remote app) on a Samsung S2, but it will not work on a Nexus 5. The LEDs light up, so I could say they "work", but not enough I guess. You may have a similar problem. What works with one phone may not work wither another.

author: Pavle
author_rank: Contributor
timestamp: February 18, 2016, 10:17:28 pm
content: With Zaza remote you can control all ir devices.I made ir remote and I have tried and it's working with all devices.

author: Pavle
author_rank: Contributor
timestamp: February 18, 2016, 10:23:23 pm
content: Solder two IR leds in opposite way to left and right channel not ground.You must turn volume to max.You can use Zaza Remote or you can record ir signal in audacity:http://forum.samygo.tv/viewtopic.php?t=76892 IR LEDS are used to double frequecny.Ir carrier frequency can be between 30-60 kHz and most common ir carrier frequecny is 38 kHz.

author: macboy
author_rank: Super Contributor
timestamp: February 19, 2016, 04:09:45 pm
content: The way that the simple two-LED headphone jack IR transmitter works is by creating two 19 kHz signals on the left and right outputs, but 90 degress out of phase. Each LED will only light when forward biased, and only when > 1.5 V or so, so only for a small part of each cycle, so it turns out that they will alternately blink at 19 kHz, creating an effective 38 kHz IR signal. This is simply on/off modulated to create the modulated IR signal. Amazingly, apatent was grantedfor this obvious nonsense.