Need Wiring Help For 12 Volt Motor

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vtsteam:
That would mean ignoring existing wiring terminals and soldering wires to the pot.

Not sure how that's simpler....

vtsteam:
Snub, here's an explanation of the schematic symbols. A schematic is just a wiring diagram -- the lines are wires.

A relay is just a switch that is pulled in by an electro-magnet (or coil). If you power that coil it attracts the armature and closes the switch.

Most relays have a normally closed switch and a normally open one. (So they are double throw ---- DT)

Double pole relays (DP) have two switches, both of which have normally open and normally closed contacts (or poles).

Hope this helps you figure out the schematic! :dremel:

snub:
Thanks very much vtsteam. I said that the joysticks were SPST, when in fact it they each have 4 SPST switches independent of each other. I will only be using 2 of the switches on each joystick. In your schematic it appears that only one switch per joystick is being used. I will grab a picture if that will help.

vtsteam:
Yes, Snub, I took you at your word on SPST, so only one switch is shown for each joystick.

I don't think I'd change anything for 4PST. You could parallel all 4 if you want -- or just use one of them.

Now if they'd been 4PDT, we could have gotten rid of relays (or even 2PDT).

And of course a "center off" Joystick would have been nice, as Andrew said -- and would have eliminated the extra ON/OFF switch needed.

vtsteam:
And if you decide to build it according to the schematic, here's a suggested build sequence:

1.) connect the Joysticks and relays, power supply, and ON/OFF switch as shown, but don't connect the motor or PWM speed controller yet.

2.) check to see that moving either joystick causes its respective relay to "click" in.

3.) connect the motor, but don't add the PWM yet.

4.) check to see that moving the speed joystick will start the motor at full revs, while letting go turns it off

5.) check to see that the direction joystick changes the direction of the motor.

6.) check the wires that will connect to the PWM input have the correct polarity by measuring across them with a meter.

7.) with power disconnected, connect the PWM to the circuit.

8.) set the potentiometer to mid position and connect power to test the whole circuit.

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