I modified the OLED screen with a touch switch sensor that is hooked to the digital input. The idea allow some interaction with the sensor. We can flip through the sensor information with short touch. We can turn on and off a switch on a long touch.
The touch controller is based on ttp23. This basically cost pennies in Ebay. All I have to figure out is to extend the touch area to behind the OLED screen. With a bit of luck, I managed to have it work just fine.
Here is a picture of the ttp23 originally look like.
