Description Files (11)

Summary

This is a simple body for a DIY sensor to detect the presence/absence of AC 220V.

Be careful while working with high voltage!

Whenever AC 220V is present between L and N on the OP22B01 board, the resistance between GND and OUT will change from infinity to ~120Ω.
The ZigBee door sensor (iH-F001) has a magnetic reed switch inside, which can be bypassed by connecting any other switch to its contacts.
By connecting GND and OUT from the OP22B01 board to the contacts of the magnetic reed switch inside the door sensor, we can detect the presence/absence of AC 220V.

Print all parts.
Glue the back part (AC_sensor_back) to the main part (AC_sensor).
Open the door sensor, solder wires to the magnetic reed switch, drill a hole for the wires, assemble it, and check if it works correctly.
Guide the wires through the hole from the compartment for the door sensor to the compartment for the OP22B01.
Put the door sensor inside and close the compartment.
Connect the wires to GND and OUT on the OP22B01 board and place the board inside the compartment. Close the compartment.
Done.

It was created to be used with Home Assistant to detect the presence/absence of AC 220V on the main power line, allowing smart sockets to be turned ON/OFF when the home is using a backup power source.
Why? To have two or more devices that can detect a power blackout event and help me save my batteries and inverter.
There is also a ZigBee smart circuit breaker (TO-Q-SY2-163JZT) configured to update voltage information as soon as possible. It updates this information even after it loses power because ZigBee is a low-power device, and there is enough charge on the capacitors to send the info.
The 120Ω resistance creates no issues for the door sensor, and it works fine with it.