#135 Arduino for Model Railways - Turnout control using solenoids and relays.

This lesson shows some of the issues when using Arduino controlled relays to control solenoid turnout motors. The code uses a stud and probe method to send the commands to the Arduino using CD4021 shift registers to allow almost unlimited buttons. The lesson on using CD4021 shift registers is at:    • #131 Arduino C++ Lesson 21 CD4021BE Shift ...   The stuid and probe video is at:    • #134 Arduino for Model Railways - Wire in ...   For the circuit diagram and code examples go to: https://www.digitaltown.co.uk/project...