HyperPixel 4 brightness (pin 19?) not working

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#1

So I’m trying to change the brightness on the HyperPixel 4 (touch and non-touch). I could only find this solution online, and it does not work:

wiringpi is installed. “gpio” is an accepted command, these don’t return an error, but they do nothing to the brightness

# Set the pin to PWM mode
gpio -g mode 19 pwm 
# Set the value/brightness to 60
gpio -g pwm 19 60

I even tried 0, 20, 90, 1023 as brightness values.

As well I did reboot to see if that was necessary. Still nothing

I’m on a Raspberry Pi 4B

#2

Is the 19 supposed to be the BCM number, physical pin number, or the Wiring Pi number? It makes a difference.

#3

Hey there. So I’m using “19” in the gpio command because that’s what the GitHub example said.

I did look up the wiring and it seems correct?

#4

Although that site does say “Wiring Pi pin 24” ??

GPIO 19 (PCM Frame Sync)
Alt0	Alt1	Alt2	Alt3	Alt4	Alt5
PCM FS	SMI SD11	DPI D15	I2CSL SCL / SCLK	SPI1 MISO	PWM1
Physical/Board pin 35
GPIO/BCM pin 19
Wiring Pi pin 24
GPIO 19 is used by PCM to provide a frame-sync signal to an external audio device such as a DAC chip.
#5

Wiring Pi has a weird pin layout, which is why I asked. Plus there can be confusion between the BCM number and physical pin number.

700×700 79.7 KB

I use Rpi.GPIO and specify BCM
It goes something like this

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)  
GPIO.setwarnings(False)
GPIO.setup(24, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.add_event_detect(24, GPIO.FALLING, callback = Shutdown, bouncetime = 2000)

I haven’t tried to do PWM with it though, not yet anyway.

#6

Ok, I’m curious if you have a starter script specifically for setting the brightness of the HyperPixel?

#7

Ok, I’m curious if you have a starter script specifically for setting the brightness of the HyperPixel?

#8

No, I don’t sorry. I don’t own a Hyperpixel. And I haven’t done much if any PWM stuff.
Have a look see at this though if you want to try RPi.GPIO. I use it because its there by default, and I didn’t find it difficult to setup for what I wanted to do with it.

raspberry-gpio-python / Wiki / PWM (sourceforge.net)