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Smart Power Plug

Main parts of the code;

  • Wifi management Initially the code will search for previously stored Wifi credentials in EEPROM and tries to connect with it. If it cannot, it will go into Wifi-Server mode running on 192.168.4.1. Go there and provide new Wifi SSID and password. Opeon restart, it will connect to new Wifi network.
  • Calculates Power using EmonLib Library. Get it from https://www.arduinolibraries.info/libraries/emon-lib and sends to PubNub channel channel_chart. Current transformer used is zmct103c. available from; https://artofcircuits.com/product/zmct103c-5a-current-transformer
  • Listens for input switch button and sends ON/OFF trigger to PubNub on channel channel_SPP
  • Listens for uncoming data from PubNub on channel channel_SPP and controls the device accordingly.

Note that the PUBNUB Rest API also sends Authorization key as SPP. Which means PubNub Access manager should be enabled on you PubNub account. Provide your publish and subscribe keys too.

See it in action https://www.youtube.com/watch?v=9gTDlD1whdw

Circuit diagram: