Link to page: https://pcbheaven.com/circuitpages/PWM_LCD_Contrast_Control
The HD44780 is a very popular Character LCD Controller very widely used. The backlit of such LCDs is usually implemented with LEDs, so a simple PWM driver can directly adjust the brightness. Unfortunately, the PWM module cannot be directly used to adjust the contrast. So, i made a very simple and small circuit to interface the PWM output of a microcontroller to the contrast adjustment pin of the HD44780 Character LCD.
Send your message to us:
Post time: Jun-25-2017