Send the following on WhatsApp
Continue to ChatESP8266: Interfacing with a 4x4 Matrix Keypad https://techtutorialsx.com/2017/03/18/esp8266-interfacing-with-a-4x4-matrix-keypad/
ESP8266: Interfacing with a 4x4 Matrix Keypad https://techtutorialsx.com/2017/03/18/esp8266-interfacing-with-a-4x4-matrix-keypad/