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how can i get a 12v motor to automatically reverse polarity or direction either by a certain time or by ???

I have a machine that is for hunting that swims duck decoys back and forth.  See youtube video " home made wake maker " but right now i  have to swith the direction automatically and i need something that i can just turn on and let the decoys swim back and forth without me touching anything.  Anyone have any suggestions?  The motor is a 12v trolling  motor with simple pulley on the top and wires are ran all the way to a box where i have a on and off swith and a switch that reverses the polarity!

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iceng5 years ago
Sorry you need this 555 circuit instead of the single resistor version .
555sqwave.gif
garyg3 iceng2 years ago

Hi i'm completely new to circuit diagrams but this circuit in theory is perfect for what I need. Could someone please draw this circuit how it would actually look wired up. I would really appreciate it and im in a hurry to get it put together and the schematic is confusing me especially using the second 555 circuit with the relay. :(

iceng5 years ago
What is your ability in electronics ?
How much do you want to build ?
How much will you buy ?

A
stumpman42 (author)  iceng5 years ago
I can usually figure it out and really whatever it costs I'm fine with I just want it working like I want!
O.K. Here is an automatic reversing LM555 and motor relay.
Go to any 555 site to pick the values of R1 and C for your timing.

A
RevRly.GIF
BillyC333 iceng4 years ago
What type of relay is used in this diagram? Thanks
iceng BillyC3334 years ago
What voltage are you using, 12VDC ?

So the relay is a 12VDC 400ma or less coil and DPDT
( Double-Pole-Double-Throw ) contacts.

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BillyC333 iceng4 years ago
yes... I am working on a project that will run a 12v motor and switch directions. This post hit my google search :)

Seems like the 555 and varying the resistor values is the easiest option.

So the DPDT relay will run the motor in one direction until energized? Then once energized reverse the motor?
iceng BillyC3334 years ago
yes
Nevermind... I think I figured it out. Thanks for your help
stumpman42 (author)  iceng5 years ago
I can usually figure it out and really whatever it costs I'm fine with I just want it working like I want!