arduino: Voltage checking simulation

It would be useful to simulate voltage checking for testing purposes. It is proposed to make the X10 pin a bidirectional pin. As an input pin, which is its current mode, X10 reports the raw measured analog value. As an output pin, a non-zero value of X10 would supply a temporary analog value to be used in the following cycle, then get reset to zero.

Here is how a low-voltage would be simulated:

Add X10 to device output pins.
Add a variable TestVoltage and set its value to be less than AlarmVoltage.
Add an actuator to send the TestVoltage value to X10.
Wait for the device to enter the alarmed state.
Either remove X10 from the outputs, increase the TestVoltage value, or delete the actuator.
The device should exit the alarmed state.

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