Wired remote for Pioneer HU

[fratello]

Thanks You so much for support ! Are some thinks I dont understand (too ...) ...
1. I dont use MPASM in code.
2. My astonishment it's about non-function of this hardware ! If I connect JUST the resistor on jack, the HU react ! If I use same resistor -via optocoupler - the HU react ! But with PIC, dont !
I increased the time for each tris command, but without results !

case 1     ; volume down    
 trisb.2=0
Pause 5000 ; I try even with this huge pause !
trisb.2=1
...
endcase

[mackrackit]

I am not familiar with the HU, but if you post the current hardware schematic (PIC, opto, HU) someone may be able to spot the problem.

[fratello]

So...with schematic from post #1 - no results !
With a simple resistor - good results ; with optocouplers - good results too.

[fratello]

...and how an "original" remote work :

[HenrikOlsson]

Hi,
I haven't studied this thread in detail but if the idea is to "place a resistance" across the plug then I don't think you can run the same code (if that's what you're doing) with the two different hardware designs. When using the circuit with the opto-isolators you drive the PIC-pin high in order to turn on the opto-isolator and connect the associated resistor across the plug - and if I read your posts correct this works fine.

It's not exactly clear to me how the plug is connected to the circuit in post#1 but it looks to me as if this circuit doesn't work the same way as the one with the opto-isolators. So, if you're trying to run the same code with the two circuits my guess is that's where your problem is.

/Henrik.

[fratello]

Thanks for support, Mr.Henrik !
When I switch to optocouplers, I changed code :

case 1     ; volume down      
Portb.2=1 
Pause 100   
Portb.2=0

My "sources of inspiration" was here : http://www.panuworld.net/minidisc/fordsony/index.htm & http://www.fiatforum.com/marea/29682...-finished.html