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.
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.
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