I was just joking but yes need that sensor, thus there is not need for the trigger when opening door then. It becomes redundant.

Opening door trigger, the system need to know you are entering or leaving the house

Cannot remember if I have posted this before but for those who are interested in 20A WiFi switch, here is the link

https://www.alibaba.com/product-detail/Tops...irstScreen=true

Both can support according to the manufacturer.

It is a simple question but difficult to answer because many factor involved other than square feet. You can just buy and evaluate. If coverage not good, just add more

It is most likely like what Fubar20 stated.

When switching on the fan at 1~4 setting, there is certain resistance in the circuitry that prevent current surge from being too high. With setting to full speed, the starting current surge brought the sonoff unit down to reset.

I think there is sonoff WiFi for fan which may prevent this from happening. The switch may have soft start circuitry.

https://www.itead.cc/sonoff-ifan02-wifi-sma...with-light.html

Anyway, does fan regulator have N in Malaysia? I think not.

Any router is designed to be left on all years long until kaput

For WiFi, still limited number but growing. Usually just Zigbee and normal touch switch

Touch switch with no control through smartphone or internet. Need to manually touch to operate

Mine paid on 23/1 only shipped out on 15/2. Not sure if ship or plane are not allowed to land

Hack your light switch for what?

Need to get up and walk also. If everything remote and through phone suddenly phone not working dunno what to do

I'd say using the zigbee mesh controller is the best but depends how big is your network and how zigbee devices are located. Maybe this will help to get idea.

https://www.control4.com/docs/product/zigbe...tices-rev-d.pdf

Try to look at the value on crystal (circled item in Fubar20 picture). Probably on the the side of the PCB? Anyway, it looks like corrosion on the battery terminal there. Maybe battery already leak. Need to clean and change battery, else permanent damage

I thought might be on the back of the PCB but very unlikely. It is strange indeed. Looks like the frequency is tuned using that blue VC1. Maybe just assume like Fubar said

They use the term driver and many think this is something new technology and term. Well it is just a power supply for the LED. It can be build into the light unit itself or separately. If separately, then need to use. The LED light use DC supply and the so called driver convert the AC to DC. The voltage can be 5V, 12V, 24V, 48V, whatever, but the LED light use constant current source which means that even if the DC input voltage varies, the current flow into the LED is constantly the same thus keeping same brightness.

Redundancy?

Maybe need smart owner

Some just like to have fun with all devices in house

First you have to know if your IP camera support PoE. If it does then which class of PoE (like PoE+ etc.). Ayway, the normal PoE I think can go up to 100m for power requirement of 15W. If you IP camera does not require power more than that then 20m is not problem. You can still put your power injector far away in house

The hole has conceal plastic base which make it difficult to hack and deepened the hole. Probably can hack the wall to the side and wire to it. Still this require hacking job