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'[OT] Trying to find special joystick.'
2005\05\01@191645 by R. I. Nelson

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I have a remote control spot/flood light (12 Volt)  That I need to
control.  It has 2 12V motors one for elevation and one for left and
right.  They just reverse the motor direction to change direction of travel.
They make a joy stick type control for this but they are rather
expensive. $90US or more  one is $165US.   I now control it with 2 DPDT
spring loaded center off toggle switches but would really like to get it
down to one joy stick type control.

Any one have an idea of where to find something that will work.

Bob


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2005\05\01@192207 by John J. McDonough

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Some of the early video games used joysticks that were basically 4
switches -- well, plus one for "fire"

--McD

{Original Message removed}

2005\05\01@195403 by Robert Rolf

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Since you're going to have to add relays to get SPST buttons to
do DPDT reversing function, why not use a regular analog joystick,
and analog comparaters to drive them? LM339 is a quad package
and easy to make into dual window comparaters.

Better yet, use a PIC and have it drive a couple of FETs with
PWM to give you proportional control of speed. Relays for direction
if you don't want to make a full H bridge.

You don't need an A/D capable PIC if you use the tristate pin A/D trick.
e.g. Set pin low, set to input and time how long it takes to
cross input threshold. It will be fairly proportional to position.
(most joysticks are 100K ohms). Or use a 556 (like the game port
does) and measure period from astable oscillators controlled
by joystick pots.

Robert

John J. McDonough wrote:

> Some of the early video games used joysticks that were basically 4
> switches -- well, plus one for "fire"
>
> --McD
>
> {Original Message removed}

2005\05\01@214204 by Jack Krause

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Bob,

Digital joysticks (i.e. ones with switches vs pots) are quite plentiful and
come in all flavors here are links to a couple:
http://www.buildyouridea.com/order.html (The base on this one is about 3
inches square)
www.goldmine-elec-products.com/prodinfo.asp?number=G14071&variation=&
aitem=1&mitem=2 (This one is tiny - about 1/2 inch square).

The problem isn't finding the joystick, it's finding one with a high current
rating (high enough to run the motors)  The upper joystick is rated at
around 0.1 amp and the lower one at just 10 milliamps!  The most practical
way to get around this is to use auxiliary (darlington)transistors or relays
(depending if you're an electrician or an electronics person) to control the
motors and reduce the current requirement of the switches.

Another approach is to get a joystick that uses microswitches (the first one
above does) and change the switches out with higher current switches, since
microswitches rated at 10 amps are made in the same form-factor as the lower
rated units.  The trouble is that you have to find switches that have the
same actuator style, and if you have to buy them new they can cost you an
arm and a leg.

Bill

{Original Message removed}

2005\05\07@204403 by David Schmidt

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Sorry for the late response.
Get an arcade joystick from http://www.happcontrols.com
They're cheap (<$20), and have 4 qty spdt switches, one for each direction.
You can wire this up to do exactly what you need without the need for
anything else.

Look in the PC controls section of their website.  You can also buy these
off ebay.

Dave

----- Original Message -----
> I have a remote control spot/flood light (12 Volt)  That I need to
> control.  It has 2 12V motors one for elevation and one for left and
> right.  They just reverse the motor direction to change direction of
travel.
> They make a joy stick type control for this but they are rather
> expensive. $90US or more  one is $165US.   I now control it with 2 DPDT

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