Products > Test Equipment

Brymen IR connection protocol - Anyone sniffed it yet?

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microbug:
Has anyone else noticed this?

jadew:
@microbug,

Yes, but it's the protocol for the cable, not the meter. It's also what confused me, because I was living under the impression that there's a more complicated handshake.

rastro:

--- Quote from: jadew on October 02, 2013, 11:52:50 pm ---
The cheapest MCU with USB that I know of is the PIC18F14K50.

--- End quote ---

Great detective work.  I'm looking to purchase a Brymen.  I'd rather build my own cable and also make it OSX compatible.
   
You may also consider the New Pro Micro ATmega32U4 5V 16MHz.  Selling on eBay for around $8.00US delivered.
http://www.ebay.com/itm/New-Pro-Micro-ATmega32U4-5V-16MHz-Replace-ATmega328-Arduino-Pro-Mini-/181177986498?pt=LH_DefaultDomain_0&hash=item2a2f0cadc2

Simon Loell:
Not because I wan't to make this a religions war on PIC vs. AVR, but I too would prefer an AVR. Mostly because of my experience.
And the Pro Micro Arduino board you link to Rastro, looks very promising. It only needs a power stage (SOT23 N-FET) for driving the TX IR LED.

I won't be making a lot of measurements before monday, but this project has triggered somthing in me.

jadew:
Yeah, I'd prefer an AVR as well. I guess we'll see, I'll do some tests tonight, after work, with V-USB and if the USB stuff takes less than 1ms to complete, it shouldn't interfere with our clock too much and we could do this with a tiny25, tiny2313.

As for the TX transistor, looks like it could do with out, but I guess it's better to have it in. It needs about 30mA (in my case), which is doable from one pin on the tiny2313.

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