Search found 2 matches

by BobsID
Thu Mar 22, 2018 5:20 pm
Forum: UWVD (Ultra Wide Viewing Display)
Topic: Can the LED backlight on a LCD be dimmable?
Replies: 4
Views: 672

Re: Can the LED backlight on a LCD be dimmable?

Yes. A resistor inline with BL+ or BL- will give a fixed intensity; a trim pot will provide manual control; a computer with a PWM port to a transistor switch will provide program control (use a large capacitor and a resistor as a low-pass filter to avoid rapid switching of the LED.) The transistor w...
by BobsID
Thu Mar 22, 2018 4:45 pm
Forum: Character LCD
Topic: Which pin on a character LCD is for contrast?
Replies: 2
Views: 235

Re: Which pin on a character LCD is for contrast?

Typically, pin 3 for 20x4 or smaller, or pin 12 for 40x4 displays, but, as always, READ THE MANUAL for your device!