I am needing some help on a project for my daughter's school. We are building a new chicken coop and wanted to install an automatic door on it. I have some material available that I thought would work in this project.
12v battery
12v timer - I can set to go off upto 4 times a day and can limit the run time from 1 to 60 sec. (deer feeder timer). It has 2 wires going to a battery and 2 going to the motor.
I was thinking I would use a window regulator and frame out of an automobile window.
Im not sure how to wire it to reverse the motor to go up and then down. I want to keep it as simple as possible and reliable is a must.
I believe you just reverse the voltage polarity to the motor to reverse its direction, which can be done with a DPDT relay. The difficult part is generating the logic to control the motor and relay. If someone can program a microprocessor, that would be the simplest way.
You probably also need limit switches to stop the motor at each end of its motion.
the frame out of the auto operates like a sissor lift it can only go so far. the timer i can set to run at second intervals so i can limit the motion as well by the run time i set it to possibly 3-4 seconds. can it be done with just the DPDT relay?
the frame out of the auto operates like a sissor lift it can only go so far. the timer i can set to run at second intervals so i can limit the motion as well by the run time i set it to possibly 3-4 seconds. can it be done with just the DPDT relay?
It may only go so far but I don't think you can leave power applied without burning out the motor.
You can use the DPDT relay to reverse the motor but what would you use to control the relay so that it reverses at the proper time? That requires some logic and memory circuits. You have to write down the sequence of events you need to control, and then generate a method to execute that sequence.
ok the timer goes off at 7am and runs for 3 sec. sending power to the motor for 3 sec and turns off.
then at 6pm it will go off again for 3 sec sending power to the motor.
at the 6pm setting i need it to reverse the polarity
ok the timer goes off at 7am and runs for 3 sec. sending power to the motor for 3 sec and turns off.
then at 6pm it will go off again for 3 sec sending power to the motor.
at the 6pm setting i need it to reverse the polarity