Hyperpixel4 backlight flickering

[gordon77]

I am trying to control the backlight on a hyperpixel4 display.

I found code using pigpio which seems to work fine for a while but then after I return the lcd to full brightness it flickers badly.

The code I use...(based on what I found on the internet)

Code: Select all

os.system("sudo pigpiod")
import pigpio
self.gpio = pigpio.pi()
self.gpio.set_PWM_frequency(19,100)
self.gpio.set_PWM_dutycycle(19,self.bright)

I then alternate between values of 0 and 255 for self.bright to switch the backlight off or on as required.

Code: Select all

self.gpio.set_PWM_dutycycle(19,self.bright)

The best I can mange is using self.gpio.set_PWM_frequency(19,601), where 601 is approx 10x the display freq reported of 60.06Hz.

Anyone else got it working ?