Wheel Angle Sensor
is required by AGOpenGPS, you need something like:
or
you can find such sensors in every car for height controll of lights or for suspension. most of them have 3-6 connectors.
or something like a linear potentiometer running at 5 v.
knuckles Installation:
Most of these Sensor have connectors like this:
- 1: +
- 2: -
- 4: Signal
Delphi ER10031 Pinout (Looking from the top of the unit, connector facing the rear)
- Left Pin: +5V supply
- Middle Pin: Signal
- Right Pin: Ground
Princess auto headlight level sensor (2012 Camaro) pin out:
- With tab up
- 1: +5V in
- 2: signal out (low V at rest)
- 3: -GND
connect it like in the jpg to 5V, GND, and AO
Using a 16 bit ADC to read the Wheel Angle Sensor
There are some Advantages to read the Wheel Angle Sensor with a 16-bit Analog-Digital-Converter (ADC) like the ADS1115, instead of the 10bit one, inside most of the Arduinos.
ADS1115 external connected via I2C 
- More Counts per degree allows more precise Steering.
- The Ability of the ADS1115 to read the Signal in a Differential Mode allows you to read Factory Installed Sensors, which are connected to the Tractor, in a Ground floating Way, this prevents setting fault codes in the tractor software. Differential means the ADS just measures the difference between two wires, not between Arduino Ground and a wire.
Schematics and Code at http://github.com/Coffeetrac (the Hires version)
