Wired remote for Pioneer HU

[fratello]

Hi ! I try to build one wired remote for HU Pioneer , using remote control stalk near the steering wheel, from Renault. I wrote the code ; in simulation work fine. But...I don't know how setting ports "b" and what to do when push_button it's press.
In "original" remote, the command are given by putting resistors "to ground". How can I do this with my PIC ? Thanks in advance !

@ DEVICE pic16F628A, INTRC_OSC, WDT_OFF, PWRT_OFF, BOD_OFF, MCLR_ON, LVP_OFF, CPD_OFF, PROTECT_OFF 

   
   Include "modedefs.bas"   ' Serial Protocol
   Define   OSC 4           ' 4MHz 
   CMCON = 7                ' Disable on-chip comparator, PORTA in digital mode
              
   '// Define port pins as inputs and outputs ...
   TRISA  = %00000111
   TRISB  = %11111100

portb = 1
include "c:\pbp\keypad2.pbp" ' see http://www.picbasic.co.uk/forum/showthread.php?t=3250

main:
gosub keypadscan
gosub check
goto main

check:
select case key 
case 1     ; volume down
   trisb.2=0    ; ?????
   pause 200    ; 
   trisb.2=1    ' ?????

[mister_e]

one thing I would make sure before connecting this to the car... measure the .spurious/floating) voltage on the tip pin when nothing it pluged.. if it's 12 volt you want to change some part of your hardware. Case it's 5 volts (or so), well there's no problem with your current solution

What you need to do is to clear the PORTB bits (to 0) and set your TRISB bits to 0 when you want to set a resistor to ground, and to 1 when you want to disconnect the resistor from the circuit. The more you clear TRSIB bits, the more resistor you add in parrallel. You should know how to calculate/evaluate resistors in parrallel, so, just etablish some value and work around this. Maybe you don't need more than 3-4 resistor to reproduce the whole value in the table above. If you feel lazy, then use 8 resistor and assign them to a whole 8 bits port. easier, need a bit more I/O... but easier. BTW you already get the idea as per your code.

8 resistors, 6 button = 14 I/O, a PIC 16F628 will do the trick without any need for a matrix keypad.

Button1 VAR PORTA.0
Button2 VAR PORTA.1

IF Button1=0 then set your resistor on portb
If Button2=0 then set your resistor on portb
.....

or

Button var PORTA
Select Case Button
     Case xyz
          Set yourresistor
     Case abc
           Set another resistor
....

How about that?

[fratello]

Thank You verry much for support !
I use matrix keypad because the Renault remote act like one (see picture) !

What you need to do is to clear the PORTB bits (to 0) and set your TRISB bits to 0 when you want to set a resistor to ground, and to 1 when you want to disconnect the resistor from the circuit.

So, it's enough (?) something like this :

case 1
portb.2=0
trisb.2=0
pause 500 ; i put the resistor on portb.2 to ground for 0.5 sec
portb.2=1
trisb.2=1

The "portb" it's OK to set in header "PORTB=%11111100" ?

[pedja089]

Set all pin to low, and then just change tris registers, instead of changing port and tris.
Also add 5.1V zener between resistor common wire and ground.

[fratello]

Now it's ok ?

   '// Define port pins as inputs and outputs ...
   TRISA  = %00000111
   TRISB  = %00000000


include "c:\pbp\keypad2.pbp" ' see http://www.picbasic.co.uk/forum/showthread.php?t=3250

main:
gosub keypadscan
gosub check
goto main

check:
select case key 
case 1     ; volume down
portb.2=0
pause 500 ; i put the resistor on portb.2 to ground for 0.5 sec
portb.2=1

[mister_e]

PORTB=0
TRISB = 255 ' Disconnect all resistors from the circuit
' Some code here
DoItAgain:
          SELECT CASE XYZ
                    CASE ABC
                              TRISB.0 = 0 ' Connect PORTB.0 resistor to the circuit
                    CASE DEF
                              TRISB.0 = 0 ' Connect PORTB.0 resistor to the circuit
                              TRISB.1 = 0 ' Connect PORTB.1 resistor to the circuit
                    CASE GHI
                              TRISB.0 = 0 ' Connect PORTB.0 resistor to the circuit
                              TRISB.2 = 0 ' Connect PORTB.2 resistor to the circuit
                              TRISB.3 = 0 ' Connect PORTB.3 resistor to the circuit
                    END SELECT
                    PAUSE 500
                    TRISB = 255 ' Disconnect all resistors 
                    GOTO DoItAgain

[ScaleRobotics]

I'm confused. So, your big thank you a year ago, (and the happy dance by Steve) was for code you couldn't get working? Or you didn't try the code until now? Perhaps more explanation is required, at least for me.

[fratello]

Yes, I have not tested this scheme until yesterday ... and how I say, I found that does not work ! Even if my ohm-meter show "right" value of resistances ( at every press of buttons) the HU not react ; with optocouplers all are ok. Strange for me...The hardware it's finished, but remains my astonishment about this. Thanks for reply !

[Archangel]

Welllll Fratello, it seems you've been bitten by a simulator ?
One hint from Steve's code's comments . . . " MUST USE MPASM " . . . Your configs indicate PB assembler.

[fratello]

Thanks for reply !
I do not think I understood very well ...What that means "MUST USE MPASM" ?!
Trisx.y in PBP it's not like trisx.y in assembler ?

[mackrackit]

Read
http://www.picbasic.co.uk/forum/showthread.php?t=543

And stop using the simulator, or at least let everyone kow that you are when you post a problem.

[Archangel]

Thanks for reply !
I do not think I understood very well ...What that means "MUST USE MPASM" ?!
Trisx.y in PBP it's not like trisx.y in assembler ?

Must use the MPASM assembler from Microchip, and not the PB assembler supplied with PBP. I am betting the simulator defaults to using MPASM and simply ignores the PB configs altogether. So when you run it, it knows what to do with Steve's keypad code whereas PB does not.Most of Steve and Darrel's code samples require MPASM, and when you upgrade to PBP3 it ONLY uses MPASM, so it is a worthwhile change.

[Sandiki]

Hi,

did any of you build adapter for stalk steering wheel controls on renault (tuner list stereo instalation, mine laguna year 2002) for pioneer? I saw scheme above but i dont know how to wire it in little yellow miniISO 6-pin jack that is connected on steering wheel controls? Any help?

Thank You in advance.

[jamie_s]

the reason the original design doesnt work is due to parallel resistors not giving the required voltage at the stereo plug (due to voltage divider effects), by using opto's you are supplying discreet resistances which results in the correct voltages