[Python] Change Panel Brightness while running

[Fipschen]

Hey together,

I'm using my panels with a Raspberry Pi 4 and Joy-IT Matrix Controll Board. The panels I'm controlling with Python. The comands, what the panels have to show, I send via TCP Sockets from another Raspberry Pi. One of the comands are changing the brightness of the panels.

I've tried two ways to change the brightness:

First way was to load new options into the display-class: `def changeBrightness(self, brightness): options = RGBMatrixOptions()

    options.hardware_mapping = 'regular'
    options.rows = 32
    options.cols = 32
    options.chain_length = 6
    options.parallel = 2
    options.row_address_type = 0
    options.multiplexing = 2
    options.pwm_bits = 11
    options.brightness = brightness
    options.pwm_lsb_nanoseconds = 130
    options.led_rgb_sequence = "RGB"
    options.pixel_mapper_config = ""
    options.panel_type = ""
    options.gpio_slowdown = 4

    #if self.args.led_show_refresh:
      #options.show_refresh_rate = 1

    #if self.args.led_no_hardware_pulse:
    #  options.disable_hardware_pulsing = True
    #if not self.args.drop_privileges:
    options.drop_privileges=False

    self.matrix = RGBMatrix(options = options)

    self.newImage(1)
    self.newImage(2)`

The second way was to load the display-class new with other brightness-option: `def init(self, brightness = 80, *args, **kwargs): super(Display, self).init(*args, **kwargs) #self.matrix = SampleBase.matrix options = RGBMatrixOptions()

    options.hardware_mapping = 'regular'
    options.rows = 32
    options.cols = 32
    options.chain_length = 6
    options.parallel = 2
    options.row_address_type = 0
    options.multiplexing = 2
    options.pwm_bits = 11
    options.brightness = brightness
    options.pwm_lsb_nanoseconds = 130
    options.led_rgb_sequence = "RGB"
    options.pixel_mapper_config = ""
    options.panel_type = ""
    options.gpio_slowdown = 4

    #if self.args.led_show_refresh:
      #options.show_refresh_rate = 1

    #if self.args.led_no_hardware_pulse:
    #  options.disable_hardware_pulsing = True
    #if not self.args.drop_privileges:
    options.drop_privileges=False

    self.matrix = RGBMatrix(options = options)

    self.mode = "startScreen"`

elif state["comand"] == "change_brightness": display = Display(state["brightness"]) display.setMode("operation") display.newImage(1) display.newImage(2)

Both ways are successfull, if i'm changing the brightness one or two times. But if I wanna do it more often, the panels are shut off and the Python-Script process is hanging off and I've to stop it with closing the terminal.

What I'm doing wrong, btw. what other way are possible to change the brightness while running?

Thank you very much

Fipschen