Sony IR Remote

[flotulopex]

Hi fratello,

Using PIC 16F628A I build this remote-by-wire for my Blaupunkt...

Did you change your mind? No IR anymore?

If I'm wrong and you still want to go for wireless, then you can improve a few points.

You should modulate your signal on a carrier of about 38 kHz...

Ignoring the use of a carrier frequency will make you very frustrated because of the very poor efficiency of your remote.

You can simply use the PWM module and PORTB.3 to do this; nothing else is necessary (not even assembly). The trick using PWM is to switch ON (set a value) and OFF (set to zero) the duty-cycle for the time of the HIGH and LOW pulses

OR have a look here if you want to make it another way (adding external components): http://www.rentron.com/Infrared_Communication.htm

According to you schema, you need to "switch ON" permanently your circuit to be able to use it. What if you forget to switch it OFF during a few days? You may need to add a "soft-switch". A soft-switch will combine your buttons as command and power-switch; a simple search will help you.

[fratello]

Thank You for support !
I say in post #23 : with PWM work great ! I try with 16F628A and it's ok ( this PIC work in both variants -by wire and by infrared) ! I drive IR-LED through NPN transistor and the range is fine (It's necessarily only 30-40 cm !)
I say in post #37 : without PWM ( using assembly), I have good results with 12F675. Only problem is "detecting" the correct timming, because of inaccurate intr_osc. Maybe with external cristall the things are changed, but losing 2 pins...
Finally I decided to use by-wire remote (for 5 commands ), with 2 wires (to ADC-in of PIC and Ground) between steering wheel and RC Blaupunkt (see picture)...like in original schematic "interfacting a Lacetti to a Blaupunkt".
Anyway nice project !