Read the explanation. One resistor. Try 470 Ohms. Try 330 Ohms, See which is better. Or use whatever potentiometer you have to hand, adjust it for best contrast, measure the value and substitute the nearest resistor value.
Read the explanation. One resistor. Try 470 Ohms. Try 330 Ohms, See which is better. Or use whatever potentiometer you have to hand, adjust it for best contrast, measure the value and substitute the nearest resistor value.