Kenwood protocol

Project completed

 

Part 1

 

Synopsis

Attempting to get SAAB 95 (2003) steering remote to work with a
Kenwood car stereo

 

Links with some info

Pulsed code for IR found here

SAAB steering wheel remote voltages found here
(model year 2003 <-> 2005)

Prototype board IR transmitter

Attiny connected to red LED (IR diode to be used later), ADC input pin connected to potentiometer 0 - 5 V output

 

Code and decode

sample code written, no timing setup just yet.

In order to visualize the pulsed code from the LED Iset shutter speed at 2s, iso 100 and f/22 -then shaked the camera ; )

i.e. persistance of vision.

For example, this is the pulsed code for volume down:
(lead-in - 1 3 1 1 2 2 1 4 - 2 2 2 5 2 2 1 1 1)

Each binary step 0 - 255
gives 19,48mV
because math...

 

My old oscilloscope was not useful for this build, pulsetrain too long

 

Code v1.0

 

 

Pulsetrain and timing on next page