Two custom sensors to use 3x4 matrix kexpads with ESPhome. Uses the Arduino Keypad Library.
This sensor instantly publishes the numerical value of the pressed key. * becomes -6, # becomes -13, because of the ASCII value. After 500ms the value is reset to "Unknown".
This sensor gathers all pressed numbers in a string and publishes the hole string when # is pressed. The string is reset, when * is pressed. The string is automatically reset after some time.