i need to create a circuit to allow for a robot to climb a pipe. when a switch is hit the motor kick on and it begins to climb the pipe. when it hits the top switch it waits 10 seconds then reverses the polarity and the robot goes down. i already have a design for the motor system shown below however trying to get a delay seems impossible. we are not allowed to use programmable stuff so i made the choice to use a 555 timer however i cant seem to get it to work with my breadboard circuit,
any suggestions

 

Welcome to AAC!

Is this homework or a school project?
If so, what level or year in school is this class? What is the name or subject matter of this course?

 

That circuit can be rearranged with instead of one relay for start/stop and one relay for direction, to to have two relays, one for up and one for down. Each would be SPDT (form C ). That will make the control simpler.

 

Welcome to AAC!

Is this homework or a school project?
If so, what level or year in school is this class? What is the name or subject matter of this course?

this is for my uni mechanical engineering project. we are still only in the development phase and i do not know much about the electronic side as we have yet to have the unit for it. so im atm trying to self teach

 

That circuit can be rearranged with instead of one relay for start/stop and one relay for direction, to to have two relays, one for up and one for down. Each would be SPDT (form C ). That will make the control simpler.

Okay thanks for the suggestion. would this also allow for easier use of a 555 timer

 

That was certainly part of the reason for my suggestion. A timer triggered by the top limit switch will require much less logic.

The SPDT relay scheme has the motors connected between the two relay common contacts, with the NC contacts from bot relays tie to power negative, and the two N.O. contacts from the relays tie to the supply positive. Then the timer is simply for the down relay.

This is a "Classic: circuit often used for motor control in many different threads. I did not invent it, but it is one of my favorites.

 

That was certainly part of the reason for my suggestion. A timer triggered by the top limit switch will require much less logic.

The SPDT relay scheme has the motors connected between the two relay common contacts, with the NC contacts from bot relays tie to power negative, and the two N.O. contacts from the relays tie to the supply positive. Then the timer is simply for the down relay.

This is a "Classic: circuit often used for motor control in many different threads. I did not invent it, but it is one of my favorites.

do perchance have a link or example guide that i can learn from cause im still very new to this and i do not completely understand

 

do perchance have a link or example guide that i can learn from

Look up circuits for "relay motor reverse".

 

I provided a detailed description of the circuit arrangement in the second paragraph of post #5!! You already have the relay symbol in the drawing in post #1 If you were able to produce that drawing then certainly you can produce the circuit I described .

 

I provided a detailed description of the circuit arrangement in the second paragraph of post #5!! You already have the relay symbol in the drawing in post #1 If you were able to produce that drawing then certainly you can produce the circuit I described .

yes i manged to figure it out and now have it completely working with a timer and just 2 relays. really appreciate the help

 

For working on an engineering degree you do need a bit of all the different fields, electrical, mechanical, materials, and kinematics.