Grab an esp8266 (or esp8266_nodemcu 1.0) and 3v controlled relay (or a 5v relay and use a voltage step down IC)

Download esptool.py using pip install esptool

Open terminal and run the command: esptool.py erase_flash

Download the latest precompiled binary from releases section.

Flash the binary using esptool. Please refer here: https://github.com/espressif/esptool

Please reset the device after flashing is complete.

Post flashing a wifi AP will show up with SSID: oneinoXXXXX. The password is same as SSID.

Navigate to the link http://192.168.4.1/root to configure your device.

Click on "Change Password" and enter a mininimum of 8character password/ Connect to WiFi manually.

Depending on the above choice the new password may be required for the login to the device.

Navigate to http://192.168.4.1/ to control your devices (or alternatively, oneino.local).

Enter hour and minutes and click on set timer for that device to make it wake up or sleep depending on it's present state.