BMW E39 Navigation Retrofit Project
Table of Contents
- Main
- Software Design
- Arduino Power Board
- Video Switch + Backup Camera Install
- Rpi Construction
- Bill of Materials
- References
Video Switch + Backup Camera Install
Design
I built my own video switch box to route two video input sources into the TV module: the backup camera, and the Raspberry Pi.
Inputs:
- Video Source 1 (Camera)
- Video Source 2 (Pi)
- Pi Video Enable (active-high 12v)
- Camera Video Enable (active-high 12v)
- Switched Accessory Power (+12V)
- Ground
Outputs
- Composite Video Signal
- Composite Video Shield
Construction
The box is made of an e34 fan relay fuse box, e34 microrelays and sockets, and two e36 ABS relays. (all sourced from Buck’s Auto)
The RCA plugs are from digikey.
Test Setup
To test the box on all input and output combinations before I fried anything expensive, I rigged up a janky test environment in the parkade.
Luckily, I discovered the Red and Purple relays have different pinouts – which initially fed +12v into the OutputShield signal.
Final Result
With an additional relay wired into the backup light signal, and the camera composite video plugged in, the system works like a top.
Schematic
Demo Video
Full video at Youtube
Additional Installation Pictures
