Error when displaying samples on LED Matrix

[kjb05]

Hi, I've tried a couple different samples but every time I run them i get this output on my board:

Any ideas?

Thanks in advance for any help!

[angelogoncalve]

Try do this:

from rgbmatrix import RGBMatrix, RGBMatrixOptions import time

number_of_rows = 32 number_of_panels = 2 parallel = 1 number_of_columns = 32

def rgbmatrix_options(): options = RGBMatrixOptions() options.multiplexing = 1 options.row_address_type = 0 options.brightness = 100 options.rows = number_of_rows / 1 options.cols = number_of_columns options.chain_length = 1 * number_of_panels options.parallel = parallel options.hardware_mapping = 'regular' options.inverse_colors = False options.led_rgb_sequence = "RGB" options.gpio_slowdown = 4 options.pwm_lsb_nanoseconds = 130 options.show_refresh_rate = 0 options.disable_hardware_pulsing = True options.scan_mode = 1 options.pwm_bits = 1 options.daemon = 0 options.drop_privileges = 0 options.pixel_mapper_config = "Rotate:0"

return RGBMatrix(options=options)

class Point: def init(self, x, y): self.x = x self.y = y

def __repr__(self):
    return '({}, {})'.format(self.x, self.y)

display = rgbmatrix_options()

height = display.height width = display.width

for x in range(0, width): for y in range(0, height):

    display.SetPixel(x, y, 0, 255, 0)

    point = Point(x, y)
    print point

    time.sleep(1)

[hzeller]

Check that address-line C is properly connected. It seems to be clamped to ground.

[kjb05]

Sorry I am totally new to this, what do you mean by address line c?

[hzeller]

The line C as described in the wiring diagram: https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/wiring.md#wiring-diagram If you are using an adapter, check if everything from GPIO pin 18 to the chip and from there to the display (PCB and wiring) is working.

[kjb05]

I dont have any tools to actually test this the correct way but I checked to make sure everything was soldered correctly and it is. I fixed a pin that might have had a poor connection and when i tried to run another sample i got this

The same thing just with different colors. Can you think of anything else that may be causing this besides a bad GPIO connection?

[hzeller]

What are the current commandline flags you give to the programs ? Can you take a picture of the output of

 ./demo --led-cols=64 --led-rows=32 -D3

?

[kjb05]

Yes I'd be happy to, what directory do I put that commandline in? (Sorry for the hand holding but this is my first time using anything like this)

[hzeller]

No, in the examples-api-use/ https://github.com/hzeller/rpi-rgb-led-matrix/tree/master/examples-api-use

[kjb05]

Ok, here is what i receive when running that commmandline:

[hzeller]

It's uppercase -D

[kjb05]

Ah, well here is the output for that

Nothing was displayed on the LED Board

[hzeller]

you have compiled the library with adafruit hat. Is this the adapter you are using?

[kjb05]

Yes - this product https://www.adafruit.com/product/2345

[hzeller]

ok, so starting from here, you need to make it work, e.g. check power, make sure to have the right address mode and multiplexing etc. The readmed help with all the details. Make sure to use --Led-rows this library and read this readme.