misschien interessant voor sommige lezers...
https://www.hackster.io/Steve_Massikker/railway-interlocking-system-582cda?utm_campaign=new_projects&utm_content=1&utm_medium=email&utm_source=hackster&utm_term=project_name (https://www.hackster.io/Steve_Massikker/railway-interlocking-system-582cda?utm_campaign=new_projects&utm_content=1&utm_medium=email&utm_source=hackster&utm_term=project_name)
(https://hackster.imgix.net/uploads/attachments/1026574/plan_cG7LYL279H.png)
leuk stukje electronica :)