To link a standard 16×2 LCD directly with the microcontroller, for instance Arduino, you would need atleast 6 I/O pins to talk to the LCD. However, if you use an LCD module with I2C interface ... This ...

My idea for manually setting a 16bit number using two potentiometers worked technically, but was not the brilliant method I had vaingloriously imagined 🙁 Not in summary, read on…. Note: scroll down ...