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# Home page for Bluetooth/WiFi Diesel Heater Controller documentation
+## Version 1 PCB
+## Version 2 PCB, offered with case
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## Compatibility
The design presented here will only work with heaters that use a "blue wire interface".
Of course the colour of the wire is only that of a PVC sheath.
The important aspect is what the electronics hardware exists at either end of the blue wire.
+### Digital protocol controllers
If your heater uses one of the following style controllers, this design **will** be compatible:
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+### Controller loom connection
+The digital protocol controllers use one of 2 styles of loom connection.
+A 3 pin triangular waterproof conenctor, or a smaller round 3 pin waterproof connector:
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+### Heater control PCB (remains in use)
The all important part though is the control PCB within the heater.
This is the PCB within a blue wire enabled heater that will 100% work with this controller design.
The blue wire interface is circled in the following photo:
+
The important selection criteria is whether a dual transistor multiplexer is evident on the input path of the blue wire, this sort of topology **must** exist, if the wire runs direct to the microprocessor, it is most likely incompatible, and probably an analogue voltage from a pot: