DC motor continuously running forward and reverse with control of magnetic reed switch

Hi I am Arun,
I'm doing this project for demo purpose only. here the motor doesn't run reversely without changing the polarity. I'm doing this circuit with the help of 12v relay, reed switch, magnet, transistor, resistor, capacitor. the reed switch placed in two fixed places for attracting the by magnet .the magnet placed at motor gear teeth. upper and lower reed switch attracted by the magnet accordingly motor will run at forward and reverse the condition.

Operating conditions :
 1, motor move forward at a certain distance until the upper side reed switch attracted by the magnet. when the power supply switch on.
2, when reed switch attracted by the magnet remains the stop and start to reverse direction.
3, the motor move reverse at a certain distance until the lower side reed switch attracted by the magnet.
4.when reed switch attracted by the magnet remains the stop and start to forward direction.
5. It should be delay off for forward and reverse
I want this cycles continuously running. I hope better reply here from you

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Arun,Yes, since you have a DC motor, in order to reverse the motor your circuit needs to change the polarity applied to the motor. What you need is an H-bridge circuit.This Wikipedia article has a good explanation of how they work and ideas on how to construct one.
https://en.wikipedia.org/wiki/H_bridge

hi,first of all thanks for your feedback. actually I want to make the circuit with the help of relay (SPDT), res, caps, transistors. but I want to run the motors forward and reverse automatically without changing the polarity. I hope I will receive positive feedback form you.

Did you look at the Wikipedia article? It shows a circuit for making a motor go forward and reverse using switches but you can replace the switches with relays.There is a table showing which tells which switch (or relay) combinations are required to be on for different states. You can use this to build the rest of your circuit.

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