arduino: Support multiple power pins
Issue #77
resolved
Power pins are special pins that are driven LOW during an alarm. The Arduino/ESP client currently supports a single such a pin but we need three if we are turn off all three relays.
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Clarification, there are actually four relays, but the relay 0, which powers comms equipment, is controlled by the alarm pin, not a user-defined variable. It is proposed having three new variables, Power1, Power2, and Power3 which would in turn actuate relays 1, 2, and 3 respectively.