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Noob needs help
This thread has 4 replies. Displaying all posts.
Post 1 made on Saturday December 15, 2012 at 01:11
Lurking Member
December 2012

i am a engineering student trying to built a universal remote for android smartphone with the help of a dongle which converts audio into infrared signals.

i have been reading around alot but i cant seem to understand what kind of encoding method that remotes uses and how i am suppose to create algorithm for it.

i have sample a play/pause code through audio waveform and i get the bits of square wave.

i am now wondering are those code pulsing based on manchester coding and how to i decode it.i have also little knowledge as what are RC5 codes and etc.

it'll be great help if any1 could point me to the right direction in understanding all this

Post 2 made on Saturday December 15, 2012 at 08:29
Super Member
December 2007
First off, is English a second language for you? If not, please take an English class that focuses on proper grammar.

Second, why are you trying to convert audio into IR? Are you trying to have something that is controlled by voice commands?

As to where to look for help, try talking to your professor for better guidance.
"You can't fix stupid."
OP | Post 3 made on Thursday December 20, 2012 at 03:28
Lurking Member
December 2012
lol well i'm sorry if my english grammar is bad

as for the converting part i am trying to make a universal remote for all android phone so my possible options was using the headphone jack to generate tone pulses to send it to a IR transmitter led.the transmitter leds will then light up base on the remote commands which so far i read are manchester encoding.

my concern is whether my concept on how a remote works is correct.

so far i now if u press a button it'll then send the command with (header bit + command bits + address bit)

so now i am asking are the address bit and command bits are there in hex?dec?
how do you determine the period of each pulse?
Post 4 made on Monday December 24, 2012 at 00:53
Long Time Member
February 2011
Your concept will probably not work because the audio output on a phone only goes up to 10 or 12 KHz, maybe 20 KHz at the most. Frequencies for remote signals are typically around 430 MHz.

You may find some interesting information about the Redeye Mini on What is actually in their little dongle is surprising.

There is a lot of information on this site about remote codes and how they are structured. They are not all done the same way. There are some utility programs available for creating/decoding the ir commands.

Good Luck!
OP | Post 5 made on Thursday January 3, 2013 at 09:31
Lurking Member
December 2012
ok now u raised a point which confuses me. the transmission frequency of a normal tv remote is at 430MHz? and nt 38KHz?

you could say i am trying to build a dongle similar to the redeye mini

so far i managed to build the dongle and tested it sending a recorded command pulse to the receiver and so far all works. my only problem now is knowing the detailed encoding method to process those command and address bits.

until now i cant understand them lol

thanks in advance

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