Nodemcu ESP8266:- https://www.flyrobo.in/nodemcu_esp8266_wifi_development_board?tracking=5c723900abvrl
Relay Module:- https://www.flyrobo.in/5v_four_channel_relay_module?tracking=5c723900abvrl
BreadBoard:- https://www.flyrobo.in/high_quality_solderless_breadboard_with_430_tie_point_for_arduino?tracking=5c723900abvrl
Jumpers:- https://www.flyrobo.in/combo-of-3-type-jumper-cables-f-f-f-m-m-m?tracking=5c723900abvrl
MIT App Inventor:- https://appinventor.mit.edu/