Hello folks, I saw this L336 universal remote online with a learning feature. Essentially it allows to capture a signal from a remote and reproduce it. The interesting part is that it is able to do it without having a separate emitter and receiver. Here is a blog post of a teardown of this remote: https://goughlui.com/2020/10/11/review- ... ad-remote/
How does it capture the signal and then relay it back? I guess it is possible to read the signal from emitter and transmit it back somehow? Would love to hear everyone's thoughts on it.
How does the L336 universal remote work
Re: How does the L336 universal remote work
Thanks for sharing.
It is most likely some dedicated internal circuitry of the main IC in the remote.
However, check out our blog post to see how it can be done using simple components.
https://www.analysir.com/blog/2014/05/2 ... eceiver-2/
They are probably doing something similar.
It is most likely some dedicated internal circuitry of the main IC in the remote.
However, check out our blog post to see how it can be done using simple components.
https://www.analysir.com/blog/2014/05/2 ... eceiver-2/
They are probably doing something similar.
Re: How does the L336 universal remote work
That explains it! Very nice write up. I shall try this on my own and see how it goes.
Just one doubt, if I replay the captured signal exactly as is, would it be recognized by the receiving device? Or is some filtering in order to decode the data and then play it back cleanly?
I have a hunch that the chinese remote probably just replays it as is, which would simplify things even further.
Just one doubt, if I replay the captured signal exactly as is, would it be recognized by the receiving device? Or is some filtering in order to decode the data and then play it back cleanly?
I have a hunch that the chinese remote probably just replays it as is, which would simplify things even further.
Re: How does the L336 universal remote work
They would need a lot of internal memory to capture the raw modulated signal. So I expect they reduce it to timings & carrier frequency.
From investigations I have done in the past by looking at captured signals in EEPROM on these remotes....they seem to have some clever recognition algorithms which I couldnt figure out. But if you have enough storage you could capture raw signals (demodulated pulses along with carrier frequency)
I spent a lot of time trying to reverse engineer the signal stored in eeprom by these remotes with little success.
In the end we decided to create our own Arduino compatible remotes by replacing the PCB the remotes came with. See our KontrolIR product, which will be available again mid-march'26 when we return from travels.
From investigations I have done in the past by looking at captured signals in EEPROM on these remotes....they seem to have some clever recognition algorithms which I couldnt figure out. But if you have enough storage you could capture raw signals (demodulated pulses along with carrier frequency)
I spent a lot of time trying to reverse engineer the signal stored in eeprom by these remotes with little success.
In the end we decided to create our own Arduino compatible remotes by replacing the PCB the remotes came with. See our KontrolIR product, which will be available again mid-march'26 when we return from travels.
Re: How does the L336 universal remote work
Thats interesting to hear, I guess its just easier to go with a dedicated IR receiver.
Although, after some digging on google, I found this: https://forum.arduino.cc/t/arduino-ir-l ... rol/686492
It seems like he might have done exactly what I was looking for.
KontrolIR looks cool, I will be keeping an eye out for that. In the meantime enjoy your travels!
Although, after some digging on google, I found this: https://forum.arduino.cc/t/arduino-ir-l ... rol/686492
It seems like he might have done exactly what I was looking for.
KontrolIR looks cool, I will be keeping an eye out for that. In the meantime enjoy your travels!