Hello,
I have a vent air pump with a motor for two speeds, MAX\MIN.
Probably two coils.
Unfortunately, I did not plan to have such a vent in the first place, so my bathroom grid has only a single load wire for the vent.
I plan to use any supported smart 2-channel switch to pass the load to L1 or L2 (alternatively) to switch the vent between MAX and MIN rpm.
But I’m not sure I can clearly understand the setup, and I suppose there is a good chance to have both relays open at once, which will definitely fry my vent.
Let’s check such type of devices I’m trying to use in my model:
-
https://www.aliexpress.com/item/1005004779647202.html
(Tuya Smart Zigbee 2 Channel 85-250V 3 Mode Zigbee Switch) -
https://www.aliexpress.com/item/1005003332873086.html
(ESPHome 2CH WiFi Relay Module Inching Switch Self-locking)
Both have three connections:
- Normally Open
- Normally Closed
- Communication
As I understand, such kinds of relays\switches should be able to “route” the load between L1 and L2 without any problem.
I can’t understand only one thing: how could I “lock” the relay to only close L1 or L2 in “opposite” mode?
So it will never end up having both closed simultaneously, even If I push both “relay” buttons to “On” at Home Assistant (“I’m a stupid” scenario).
I want to have such options at the end:
- Turn On the vent
- Turn On the MAX speed of the vent
- Turn off the Vent
Later, I’ll connect this relay to HA with temp and humidity sensors, for example, and it will turn it on and off automatically. Still, I want to be sure that when I make a mistake - the relay will not be able to turn both “gates” at once on a physical level, no matter what automation I make.
