Kenwood protocol
Part 3
PCB schematic and unit prep
Schematic
PCB
Just a tiny PCB is needed
including a 7805 with estimated current draw of 20mA
5.1V zener as input protection via 2k resistor (SMD)
IR receiver
IR Lightguide viewed in Infrared lighting. wanted to know if i could
plade the diode to the side of instead of directly in front of it
Unit prep
IR LED is installed behind the display
Car measurement
Connector below dash, near steering wheel (blue -cavity 1):
Result:
Vol- 1.253V
Vol+ 1.668V
Src 2.072V
Seek + 2.485V
Seek - 2.904V
Nxt 3.313V
No button 4.020V
-
Engine running gives same result
Code
Seek repeat play/pause cleaned and if "hysteresis" added
Code v4.0
Installation of unit and car testimg on next page