Linking Multiple PCA9685 Servo Driver Boards

This follows on from the three part guide on how to connect servo motors to an Arduino using a PCA9685 servo driver and control them using JMRI. You can see the first video in the series here -    • Servo Motor Control for Model Railways Par...  

To use more than 16 servos you'll need to link multiple PCA servo driver boards together. A few people asked me how to do this so I've put this guide together which shows how to set up the hardware and modify the sketches from the previous tutorials

Links to servo tutorial series:
Part 1 -    • Servo Motor Control for Model Railways Par...  
Part 2 -    • Servo Motor Control for Model Railways Par...  
Part 3 -    • Servo Motor Control for Model Railways Par...  

Calibration and Servo Sketch Files to be modified: https://github.com/LittleWicketRailwa...

Links to resources:
AdaFruit Website - https://learn.adafruit.com/16-channel...
Arduino software - https://www.arduino.cc/
Auto485 library - https://github.com/madleech/Auto485/
CMRI Library - https://github.com/madleech/ArduinoCMRI

Ebay and Amazon Affiliate Links
(Full disclosure, as an Amazon Associate and Ebay partner I earn from qualifying purchases through these links and this helps to support the channel)

Arduino Uno:
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Servo Driver Board (PCA9685):
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SG90 Servos:
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Variable Voltage Power Supply:
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26AWG Servo Cable:
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Crimping Tool:
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Jumper Wires:
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Chapters:
00:00 - Introduction
01:36 - Step 1 - Solder connection to board
02:56 - Step 2 - Address PCA9685 board
04:36 - Step 3 - Setup test system
05:04 - Step 4 - Update calibration sketch
06:01 - Step 5 - Update sketch and connect to JMRI
09:35 - Summary