3D Printed Servo Motor Clock

8mb.video-h61-4O6oovC5.mp4

Print

Prusa i3 MK3S+ 3D Printer

Prusament PETG Urban Grey for the frame

Prusament PETG Prusa Orange for segment covers

https://www.thingiverse.com/thing:3266949 - clock models

https://www.thingiverse.com/thing:4633685 - 10mm spacers for mounting the pi and PCA9685 boards

Hardware

1x Raspberry Pi 3b+

2x Adafruit PCA9685 boards https://www.adafruit.com/product/815

1x https://www.amazon.com/Belker-Universal-Adapter-Supply-Speaker/dp/B07N18XN84

28x servo motors https://www.amazon.com/gp/product/B072V529YD/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Originally tried these boards but they did not work on arrival https://www.amazon.com/Onyehn-Channel-PCA9685-Arduino-Raspberry/dp/B07GJCPWW2

Setting up the Pi from factory reset

1. Basic pi config

   
   sudo apt-get install i2c-tools
   
   sudo apt install git
   
   sudo apt-get git
   
   sudo raspi-config #enable i2c and spa / configure timezone
   

   To verify boards hardware is connected to pi correctly

   i2cdetect -y 1
   

2. Circuit python lib installation

   https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi

   
   sudo apt-get upgrade
   
   sudo apt-get install python3-pip
   
   sudo pip3 install --upgrade setuptools
   
   cd ~
   
   sudo pip3 install --upgrade adafruit-python-shell
   
   wget https://raw.githubusercontent.com/adafruit/Raspberry-Pi-Installer-Scripts/master/raspi-blinka.py
   
   sudo python3 raspi-blinka.py
   

3. Validate setup was done correctly

   create and run the python script below to validate

   import board
   import digitalio
   import busio
   
   print("Hello blinka!")
   
   pin = digitalio.DigitalInOut(board.D4)
   print("Digital IO ok!")
   
   i2c = busio.I2C(board.SCL, board.SDA)
   print("I2C ok!")
   
   spi = busio.SPI(board.SCLK, board.MOSI, board.MISO)
   print("SPI ok!")
   
   print("done!")
   

4. Install and set to run on boot

   git clone https://github.com/chrisreams91/servo-clock.git
   
   sudo nano /etc/rc.local
   

   and add

   python /yourPathToDir/servo-clock/main.py