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additional intercom connection info and diagrams

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xyzroe
2021-06-24 14:43:37 +03:00
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README.md
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@@ -24,12 +24,22 @@ One flash - OFF, two flashes - ON.
## Important info
#### 1
In Gerber PCB v1.0 committed on Apr 14, there are some errors in the silkscreen layers:
1. 'Line-' and 'Phone-' are reversed.
2. '+' and '-' are also reversed.
Just plug by swapping.
#### 2
The problem of cross-calls to other apartments:
it was revealed that the intercom circuit is closed through the reverse diode of the u2 transitor (thanks to @Alex_AW)
to prevent it, you need to add a diode according to the diagram:
![](/images/fix_error_rings.png)
#### 3
If you want to use the battery version without a handset, do not turn off the sound in z2m, but use an external resistor to emulate the intercom handset, according to the diagram:
![](/images/battery_no_handset.png)
### How to join