I have prototyped a tyre temperature device working with the mlx90614 remote IR temperature sensor. It all works now. I need to lead the sensor from my wheels to the cockpit.
I am planning to use din connectors, but I find it very difficult to decide on the wiring. It needs to be flexible and durable. I was considering PUR or Neoprene cables. I was thinkng of 4 x 0,75 mm2. I guess it does not need be schielded. But honestly I have no idea. Any suggestions?
This device uses the I2C bus to send it's data (I assume you don't use the PWM interface), so it must be less than 50cm from it's controlling MCU to work more or less reliably. As a car is a rather hostile electrical environment (ignition) the should be even shorter, best is the whole circuitry inside a metal case to shield it. If you must transport that information to your cockpit you should use a communication standard designed for such cases (RS-485, CAN, etc.).
I2C communications are intended to be used between chips on a single PCB, and won't work with long wires and in an electrically noisy environment.
The best approach would be to mount the sensor as close as possible to an Arduino Pro Mini or other extremely small Arduino board (Adafruit Lillypad, Trinket, etc.) and send the temperature data using TTL level RS232 (or similar serial) elsewhere.
An idea that can be rejected and i won't get butt hurt: put a sensor with MCU in the where ever and have it transmit WiFi or BLE to the cockpit.
Another idea that can be rejected and I won't get butt hurt: A MCU back with the sensor, sending its thingies over a CAN Buss to the cockpit MCU.
Another idea that can be rejected and I wont get butt hurt: Yell out, "honey what's the reading?", and hopefully...
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