I have a Arduino Nano and 5 external I2C devices connected with I2C on pin 4 & 5.
When my sketch is starting up, it not detect if a external I2C device is connected. (i have to do this check only once at startup).
i want to create something like
and when a external device is not connected, it return with a message
lcd.print("I2C Error Device 2");
I dont know if i am on the right way. some help are appriciate.