needing help with a circuit

[hthuecks]

I'm trying to make a circuit that runs a dc motor (6volt) for about 3-5 seconds in a forward position stop and then 3-5 seconds in a reverse position. Then start back up in 60seconds to start the cycle all over again, until I turn the circuit of with a switch. Looking for it to run for about 3-5 hours. Thanks hope to hear from someone soon.

[pebe]

Do the forwards and reverse times have to be accurately matched?

[hthuecks]

No they don't but it just has to move forward for a few seconds and then reverse for a few seconds

[pebe]

A suitable circuit would use, mainly, 2 x ICs, 2 x relays, and 2 x transistors.
Could you make it up OK?

[hthuecks]

I have never done anything like this and have no idea what anything is. If you could draw me up a circuit I could have someone make me one I guess.
Thanks and hope to hear from you soon.

[pebe]

Do you know someone who could program a PIC microcontroller for you if I gave you the program? That would do a much better job.

If not I'll draw up a circuit for you.

[hthuecks]

how small of a circuit can you make me?

[hthuecks]

No I don't no anyone that can program that pic microcontroller.

[pebe]

OK. Here is a suitable circuit. You should be able to make it up on about 40mm x 40mm of stripboard.

The CD4017 is a CMOS device so don't solder on to it directly - use an 16pin IC holder and leave all unused pins unconnected.

Ideally, use a tantalum bead type for the 10µF capacitor.

Best of luck

[hthuecks]

Hey pebe can this circuit run a 3volt watch battery, also could I put a diode or a dial in to slow the motor down due to the rpms. Also thinking if the times can be changed from 4sec forward and reverse to maybe 1sec forward and reverse.

[pebe]

The circuit will not run on a 3V watch battery because the 555 requires at least a 4.5V supply. Also there is not enough energy in a watch battery to run a motor.

Putting a resistor in series with a motor will reduce its speed but will not control it. You would need pulse width modulation for it to be effective.

The 470K resistor connected to pins2, 6, and 7 of the 555 controls the motor run time. A value of 100K would be about right for a 1sec run.

[hthuecks]

Where can I purchase this stuff, and who do you recommend to make this for me?

[pebe]

I live in the UK and get stuff from here. 1st class service.
http://www.bitsbox.co.uk/
I don't know where you live so cannot suggest anyone local to you.

I thought you were going to get someone to make it up.
I don't know of anyone who can, but maybe a member here may be able to help you