This model houses a power supply and an esp-01 with two tactile buttons to work as a device to switch a light via MQTT or do any other fancy stuffy you can do over Wi-Fi. (E.g. place it in the bathroom and write code to order toilet paper ;-))

The socket fits german power outlets (Type F).

The components I've used inside:

• ESP-01 (https://www.aliexpress.com/item/1Pcs-ESP8266-ESP-01-ESP01-Serial-Wireless-WIFI-Module-Transceiver-Receiver-Internet-Of-Things-Wifi-Model/32845249185.html)
• 220V to 3.3V DC power supply module (https://www.aliexpress.com/item/1PCS-AC-220V-to-3-3V-DC-power-supply-module-transformer-isolated-Switch-module-220v-to/32853987067.html)
• 2x4 female pin header
• 2 tactile switches 6x6x6mm (https://www.aliexpress.com/item/6x6mm-Panel-PCB-Momentary-Tactile-Tact-Mini-Push-Button-Switch-DIP-4pin-6x6x4-3-5-6/32912263133.html)
• 2 metal caps for electrical contact (https://www.ebay.de/itm/10-STÜCK-ENDKAPPE-INNEN-4MM-BREMSHÜLLE-BREMSAUßENHÜLLE-BOWDENZUG-FAHRRAD-MOPED/122884525820)
• 4 2x5mm countersink screws

Anet A8 mod

Yes

Yes

0.15

30%

• glue the body and the contacts part together using superglue
• put the ac wires through the holes and solder them to the power supply
• solder wires to the 3.3V output
• place the power supply inside the housing
• solder buttons, dc wires and 2x4 female header together
• glue the header inplace
• insert the programmed Esp-01
• screw the caps to the body and make sure the have good contact with the buttons