Aplogies if I have put this in the wrong forum or board, and wasn’t sure where to put it as it is hardware, and maybe software.
I have a Humidity and Temperature project which worked for a few months using a DHT22 sensor, then the LCD screen stopped displayed the correct text, and only squares.
I have re uploaded the sketch I used, again , but now the LCD screen is showing this: Temp: nan C, and Humi: nan %
I have tried another DHT22 sensor, and it is still the same.
I have uploaded the I2CexpDiag ino sketch and the LCD screen displays what is in the actual code, so it seems to work ok.