Products > Test Equipment
Brymen IR connection protocol - Anyone sniffed it yet?
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Simon Loell:
You're observations regarding the init pulse was correct.

It seems the 10 ms pulse comes first, then some data from the multimeter, and then the clock.

I will try to see if I can manage to get some communication answers on a Tiny2313. I even found my vintage STK500 board. It's a bit dusty but I think it will work:-)

Regarding RX and TX sides: When looking on the multimeter from the back side, the multimeter RX is on the left hand side.

On the picture I have my thumb closest to mutimeter RX and the propes in the background closest to multimeter TX.
jadew:
Hmm, interesting, so I'm either not transmitting the pulse correctly (maybe not the right power or it's not the right angle) or I'm not receiving the data.

I'll try it with a hand held TX LED and will try to check the TX of the multimeter with my phone's camera, maybe it'll pick something up.
jadew:
alright... I'm getting a response, it seems the issue is that my TX diode is not strong enough, the RX side seems to work fine from pretty much any angle, but for proper TX I need to hold the LED against the small window, right in the middle and at a perfect 90 degrees angle.

Would be really nice if that's all it took, a 10ms signal.

Edit: going to look for a remote to tare down ;)
Simon Loell:
I'm glad it worked out for you.

I managed to burn the IR TX LED on my original communication cable!
But I was lucky, it only took the LED. I'm back on track again.

Did you make a loop including the clock cycles?, or did you only register the RX pin going high (active)?
jadew:
Sorry about your LED and I'm glad too it was only the LED.

I managed to get a response using the old TX led, simply by increasing the power (I lowered the resistance to 150 Ohm).

I'm about to make the clock tick. I'll let you know how it goes in about 10-20 minutes.
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