I have an ongoing project vehicle(1981 Volvo 240) that is no longer able to use the stock speedometer. I have had some experience with using GPS for my Autonomous vehicle project so I knew it would be really simple to implement a GPS speedometer gauge into my car for very little money.
Parts:
- Arduino Nano
- Sparkfun 7-Segment Serial Display – Red
- 50 Channel GP-635T GPS Receiver
I mounted the screen into one of my panels off of my car.
Screen Layout
Screen and Testing
Tested out some GPS code prior to having the screen and smaller GPS module. Its a little inaccurate when sitting still, but once the vehicle is moving its pretty dead on.
Testing GPS
And then I fit the screen and mounted everything inside my vehicle. In order to get 5V from my cars 12V system I broke open a cheap USB converter and soldered leads directly to it. This way I could still reprogram the Arduino if I needed to.
USB 12V Converter
And here it is mounted in the vehicle.
Mounted In Vehicle
