hi sir,
I have read your project description,
i need details of your machine where we have to put the sensors and make it stop. it is simple project and some proximity sensors can do good job, we have completed similar projects.
Secondly we offers our rates so low just to grab the market so if you want to save your bucks without compromise on the quality than ping me up here.
We will deliver you the circuit design, source codes and manual how to fit the things and run smoothly.
We will help you even post project completion phase started if required.
Very much looking forward to hear from you on this in coming days!
Cheers !
Ahmed