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install process for rpi-ws2811

this is the simplified install process needed to run the xmas lights ws2811 on a raspberry pi refernce to full instuctions: https://learn.adafruit.com/neopixels-on-raspberry-pi/overview

Hardware Install Process

Choose an open pin connected to the Data In of the NeoPixel strip, i.e. board.D18 NeoPixels must be connected to D10, D12, D18 or D21 to work. I prefer D12 (pin12) https://pinout.xyz/pinout/pin12_gpio18

  • connect neopixels to pins
    • 5V (Pin2)
    • Ground (Pin 6)
    • Data (Pin 12)

Software Install Process

install OS

  • install raspbain os
  • run in terminal:
    • sudo apt-get update
    • sudo apt-get upgrade

install I2C

https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c

  • tool install need, run in terminal:
    • sudo apt-get install -y python-smbus
    • sudo apt-get install -y i2c-tools
  • configure options
    • sudo raspi-config
    • select Interfacing Options --> I2C--> yes --> ok
    • sudo reboot
    • after reboot
    • sudo i2cdetect -y 1
      • This shows that two I2C addresses are in use – 0x40 and 0x70.
      • i see the graph, but no in use`
    • ls /dev/i2c*
      • see the responce "/dev/i2c-1"

install SPI

https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-spi

  • configure options
    • sudo raspi-config
    • select Interfacing Options --> SPI --> yes --> ok
    • sudo reboot
    • after reboot
    • ls -l /dev/spidev*
      • you should see two 'devices' one for each SPI bus
       /dev/spidev0.0
 /dev/spidev0.1

Enabling Second SPI

add code to file /boot/config.txt

  • sudo nano /boot/config.txt
  • "add to bottom of file"
 # Enabling Second SPI
 dtoverlay=spi1-3cs
  • cntl + x
  • y
  • enter
  • sudo reboot
  • after reboot
  • ls -l /dev/spidev*
    • you should see 5 devices one for each SPI bus
    /dev/spidev0.0
/dev/spidev0.1
/dev/spidev1.0
/dev/spidev1.1
/dev/spidev1.2

install python and pip

  • sudo python3 -V
  • verify verion 3 (Python 3.5.3)
  • sudo apt-get install -y python3-pip
  • sudo apt-get install build-essential libssl-dev libffi-dev python-dev

Install Python libraries

  • sudo pip3 install RPI.GPIO

  • sudo pip3 install adafruit-blinka

  • sudo pip3 install --upgrade adafruit_blinka

  • "test python and libaries are working

  • sudo nano blinkatest.py

  • add code to file

    import board
import digitalio
import busio

print("Hello blinka!")

# Try to great a Digital input
pin = digitalio.DigitalInOut(board.D4)
print("Digital IO ok!")
# Try to create an I2C device
i2c = busio.I2C(board.SCL, board.SDA)
print("I2C ok!")
# Try to create an SPI device
spi = busio.SPI(board.SCLK, board.MOSI, board.MISO)
print("SPI ok!")
print("done!")

  • cntl + x

  • y

  • enter

  • sudo python3 blinkatest.py

  • you should see the following

Hello blinka!
Digital IO ok!
I2C ok!
SPI ok!
done!

install python

  • sudo pip3 install rpi_ws281x adafruit-circuitpython-neopixel
  • sudo pip3 install pyserial

install previous work in the repo

  • sudo apt install git
  • sudo git clone https://github.com/DanStach/rpi-ws2811.git