hi have a project from school for a waiter robot that also pushes a solenoid when he gets to his destination basically like a line following robot that knows when he reached his destination and maybe has a preference for his destination skip one for another
Put a button in the front of the bot and an obstacle at the end of the rout.
Very interesting project. Can you explain this a bit more. Usually a solenoid pushes or pulls something else. IS the solenoid on your robot or is the solenoid attached to something else?
no I'm sorry the solenoid isn't being pushed or pulled
but is pushing what is supposed to be a box it was my mistake
if you want to know about the idea of the project
we are building a bot that would deliver medicine boxes to patient's beds and we are looking for a way for the bot to recognize each bed
I thought about connecting it to a greyscale sensor but I am looking for different/better ideas
Let's hope your instructor does not grade you on political correctness!
You could try adding another line following sensor, and then adding more to the trail.
What are your restraints?
What are you allowed to do?
What can you change?
he surely does not grade me based on my English 
I thought about adding one more line following sensor but then the bot doesn't know the path it should go through I want the bot to go from station 3 to 1 or 2
You will need to do what everyone else in the hospital does. Check the wrist band. Beds get moved. Beds get replaced when disinfected. Rooms get rearranged when patient counts change.
You cannot count on a patient being in the same room as they were an hour ago.
And I might add, medication of any type is ALWAYS delivered to the nursing station on that floor or area. A machine would never be allowed to do such a thing. Too many ways it could go wrong.
Make your stop at the nursing station. It is ALWAYS at the same location.
Put three polarized retroreflective photoelectrics on the robot. At each station designate three places which will come under the PEs as the robot passes. By putting strips of reflective tape in those places you could get seven different codes to make decisions on.
Lets suppose your line following robot is using optical guidance to follow a track.
Put a bar code on each station, and a single sensor on the robot.
As the robot passes it will see and read the bar code as a series of "dots & dashes"
this isn't a real scenario I'm building it for a school project
I'm going to try and do this
Look into using BLE, Bluetooth Low Energy. Check out indoor navigation using BLE.
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