# hw-stroy-master-domofon

HW for intercom from stroy master domofon.

## CMD-7

```mermaid
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 | | |