Setup:
i have Raspberry pi 4 and put the unicorn hat (8x8) on it.
It is a freshly installed raspberry os
i installed the libraries linked in the shop site at GitHub - pimoroni/unicorn-hat: Python library for Unicorn pHAT and HAT. 32 or 64 blinding ws2812 pixels for your Raspberry Pi
If i try to run any of the examples from the github, only 2 of the LEDs, and always the same, light up one stronger the other lighter. They change color. (see image below)
What i tried:
- Changing Power supply (official raspberry supply and a 3mA variant)
- different raspberry pi
I have also tried different products like a 8x8 CJMCU matrix or a LED stripe with ws281x LEDs.
Different libraries like adafruits neopixel or GitHub - jgarff/rpi_ws281x: Userspace Raspberry Pi PWM library for WS281X LEDs.
Its always that some LEDs light up but dont do what they are supposed to do.
I also checked the signal on those other products they do recieve the correct 5V signal from the raspberry. I also checked the recived power.
Now i tried the Unicorn hat because you just plug it in cant do that much wrong i thought. But it still doesnt work and im out of options.
Pictures:
Unicorn hat:
Image is taken while running rainbow.py.
No Errors or warnings in console while starting or running a script (i.e. rainbow.py) from the unicorn hat repo.
Edit:
This is my boot config.txt:
# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details
# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1
# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16
# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720
# uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1
# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1
# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2
# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4
# uncomment for composite PAL
#sdtv_mode=2
#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800
# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on
# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18
# Additional overlays and parameters are documented /boot/overlays/README
# Enable audio (loads snd_bcm2835)
dtparam=audio=on
# Automatically load overlays for detected cameras
camera_auto_detect=1
# Automatically load overlays for detected DSI displays
display_auto_detect=1
# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2
# Disable compensation for displays with overscan
disable_overscan=1
[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1
[all]
[pi4]
# Run as fast as firmware / board allows
arm_boost=1
[all]
enable_uart=1