I am working on a wiring scheme for doing a little perf board with several sensors. The perf board will connect to an Arduino by using RJ-45 jacks and an ethernet cable.
The first use is for a refrigerator door open logging project. I am studying the impact of opening the refrigerator door on energy use. The Arduino will be 20 feet away and plugged into a computer.
Here is the pinout so far
- Pin 1 +5 volts through 110 ohm current limiter
Pin 2 Thermistor 1. Between 5K resistor tied high and 3k thermistor.
Pin 3 Thermistor 2
Pin 4 High side of normally open Switch1 in series with current limiter.
Pin 5 High side of LED1 with current limiter to ground
Pin 6 High side of LED2 with current limiter to ground
Pin 7 High side of Switch 2
Pin 8 Ground Common for 6 devices above.