hw-stroy-master-domofon

HW for intercom from stroy master domofon.

CMD-7

stateDiagram-v2
    [*] --> Idle: High Impedance (>10kΩ)
    Idle --> Ringing: Panel applies AC/Pulsed DC
    Ringing --> OffHook: Line load drops to ~300Ω–600Ω (Answer Call)
    OffHook --> DoorRelease: Line shorted to <50Ω (Press Button)
    DoorRelease --> Idle: Panel unlocks door & resets

state	Resistance	Voltage
idle	56 kOhm	0V
ring
peak
open