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EDIT :

See logs for what reacts FIS with sent caracters ... 6112

LineK schematics , but we need a program to send values to see how reacts car radio LineK wire ...
6113
code :

data(data...

I think it is more reliable to use Kline to access to all functions (i am going to try to use these adresses Kline functions)
i have a code but i have to work on it (Kline access based) .i will give...

Hello Karl ,
glad to see you in this forum .
I hope that you will find for this new type of Car radio steering wheel command's .
I had news and very usefull help from mister_e , i hope you will...

I've just seen that TRISB miss for input PORTB

Is this mistake provide bad functionnal reactions ?

OPTION_REG7=0
TRISB = %11100111 (RB5 to RB7-->steering wheel button detection , RB0 to...

Hello,

i have already put OPTION_REG for pull-up resistors on port B but it is strange :

on RB5 , RB7 i have 6.7 Volts and on RB6 i have 4.98V
My voltage regulator provide 5V and 12V on...

If i put transistor directly to FIS without the +12V and 10Kohms resistors , i can have 12V from FIS (low level on PIC pin) and ground when transistor is "excited" .

How find it ?

it is a 1J5 920 846 C from golf4 .

the 3 pins 23 / 24 / 25 on the FIS tacho.. are "on the fly" with 12V voltage .
Perhaps , with my 12V transformer (12V/300mA) , the inputs required more than 300mA that caused a power failure....

i put today +12V directly on FIS Tacho input , with harware power failure ...
What is the difference with +12V (10Kohms resistor) ??

Thanks for your answer ...

My program works like this :

a detection for RBx cause a different display to FIS Tachometer and for input isolator (output RC5,6,7) cause a +5V and +12V on output isolator .
BUT it is dangerous...

I have
Input pulsup (B5,B6,B7)
Input pulsdw
Input pulsres
and
Output mup (C3,C4,C5)
Output mdw
Output mres
High mup
High mdw

I will have +5v on isolator inputs and +12v on output ?

Hello,

i have a system with a PIC16F877A that is in serial with steering wheel command (RESET / UP / DOWN on B5,B6 et B7)
I am programing to put ground on outputs (RC3 ,RC4 ,RC5 ) but for valid...

Do the diode zener serve to fix no Function if i have no +12V on input regulator ?
Because when i put off +12V , i have a loop function (again and again.....)

Steeve ,

do you know where is the values for other functions like up/down/valid (press 2 or 3 seconds on function button) / EQ/Display ?
I have all general functions under 100kohms .
it is for...

Hello,

i tried with my car radio , it works well but a little slow for buttons reaction .
Perhaps the pause ...
I will try to integrate interrupts with it.
many thanks Steeve.

regards
Hervé

STUPID I AM , no pull-up resistors for RA2 and RA3....

i 've just try compiler 2.60 plus patch 2.60c under microcode studio 3.0.0.5
and verify fuse under willem (hs) , always the same .
arg , no understand why if the code is good...

Dunno buddy , your program Code works very well with some resistors and one led on my PIC Hardware platform test .
With it , the intensity varies according to different buttons .
Perhaps microcode...

i am so disapointed because it doesn't work on test real card and works on simu.
strange...
i have microcode studio with 15 days trial .(compiler 3.0.0.1)

TRISA = %00001111 ' RA0 et RA1...

Hello,

it works all !
great and many thanks.

I made another "formule" in addition to yours (to work with 12 buttons and 4 channels__3 buttons on a wire)
It is perhaps not proper .
I add to...

Can i use btn as word variable for a select case like 1110111111111111 ?
(with your formule dcd(i).... )
i can't for the moment ...
i use adcchannel 0 to 3 .

Regards.
Hervé

in fact , the simulator isn't reactif with adc , i must go slowly with an0/an1 choice .
But step by step around button(i) , it works.

I must add six other buttons in programm and .

i repeat my question :
how tie the resistors on the side of PIC together to have a resultant resistor in parallele ?
i agree that the other side is tie together to the radio , but on the ground...

Hi Steeve,

i test intensity value with some résistors tie together to one led.

But with your program , trisb stay at 255 , i put some select case for test but no trisbx.0 work (255 always)
I...