4-mic Array LED Control Lessons

Products & Technology ReSpeaker
#1

Hello,



I have the 4-Mic Array with 12 circular LED’s on top. It is on a Raspberry Pi 3B+ and working fine. In fact it is a great little device.



My problem is that I am really struggling with fully understanding how to control the LED patterns. I have been through the demo files (which all work fine) very slowly several times and I am still having a hard time with it. I would like to generate my own patterns and colors, but I just can’t seem to get a grip here. I have taken several online Python courses and have a strong basic understanding of the code, I just can’t seem to figure out the correct way to do this.



If there is anyone out there willing to give me a lesson or point me to a “for dummies” resource I would really appreciate the help.



Thanks,

Stephan

#2

Hi Stephen



Please take look at https://github.com/respeaker/pixel_ring, the pixel library. thanks.

#3

OK, went through that and it is the same issue. A .py file that calls another one that calls another one until I am confused as hell.



Let’s make it simple. Can anyone tell me how to change the blue to any other color in the Alexa or Echo pattern?



Thanks,

Stephan

#4

Hi Stephen,


  1. Install the git client: sudo apt install -y git
  2. Prepare GIT: git config --global user.name “John Doe” && git config --global user.email [email protected]
  3. Create a development directory and change into it: mkdir ~/Development && cd ~/Development
  4. Get the APA102 Library and sample light programs: git clone https://github.com/tinue/apa102-pi.git && cd apa102-pi
  5. cd apa102-pi && nano sample.py; Update as below, Ctrl-X and “Yes” to save. you can change any led and any color at strip.set_pixel_rgb(5, 0xFF0000).



    #!/usr/bin/env python3

    “”“Ultra simple sample on how to use the library”""

    from driver import apa102

    import time

    from gpiozero import LED

    power = LED(5)

    power.on()

Initialize the library and the strip

strip = apa102.APA102(num_led=12, global_brightness=100, mosi = 10, sclk = 11,

order=‘rbg’)


Turn off all pixels (sometimes a few light up when the strip gets power)

strip.clear_strip()


Prepare a few individual pixels

strip.set_pixel_rgb(5, 0xFF0000) # Red

strip.set_pixel_rgb(6, 0xFFFFFF) # White

strip.set_pixel_rgb(8, 0x00FF00) # Green

print(“cc”)

Copy the buffer to the Strip (i.e. show the prepared pixels)

strip.show()


Wait a few Seconds, to check the result

time.sleep(1)



6.Run the sample lightshow: ./sample.py.

#5

Hi,
Nice tips, the LEDs started to do nice dances. But the problem I have is that there are only 6 LEDs doing that out of the 12, only in a half ring.
Is it a HW issue?
Thanks.