[dba-Tech] Foot switches / controls

Yea, I am going with the current setup, just using pwm to change the duty
cycle over time (a couple of seconds) to "ramp up" the speed.  In the end
that will be good enough in any case. In fact his car has a reverse, "low
speed" and a "high speed" in the gear stick so there are in fact two
different forward speeds now.  The variable foot switch is just a "down the
road" thing.  I like to have my ducks lined up before I get to the point of
needing the ducks.

John W. Colby
Colby Consulting
www.ColbyConsulting.com

-----Original Message-----
From: dba-tech-bounces at databaseadvisors.com
[mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of Lembit Soobik
Sent: Thursday, September 28, 2006 9:38 AM
To: Discussion of Hardware and Software issues
Subject: Re: [dba-Tech] Foot switches / controls

John,
how about this:
- phase 1: have the existing switch start a slow ramp-up controlled by the
microcontroller.
- phase 2: add some manual switches which define ramp-up and final speed.
- then I would build an own pedal either with LEDs and phototransistors or
two coils and the pedal moving a ferrit core thus increasing/decreasing the
transfer between coils. one coil having a simple oscillator, the other
charging a C, and you  measure the dc with your controller

Lembit

----- Original Message -----
From: "JWColby" <jwcolby at colbyconsulting.com>
To: "'Discussion of Hardware and Software issues'" 
<dba-tech at databaseadvisors.com>
Sent: Thursday, September 28, 2006 1:46 PM
Subject: Re: [dba-Tech] Foot switches / controls


>I am looking for something inexpensive to use as an analog (as in
> continuously variable) accelerator pedal for my son's ride-on toy.  ATM it
> is just a simple go/nogo switch.  I am working on a controller to 
> interface
> to that switch to allow me to do a "soft start" to ramp up the motors over
> time to spare the gearboxes the huge torque they see now as the motors 
> just
> come full on.  While I am at it I would like to actually allow a realistic
> accelerator which can be varied from off to full on over a range.  Someone
> pointed me to hall effect transistors but I haven't found a useful system
> there either.
>
> John W. Colby
> Colby Consulting
> www.ColbyConsulting.com
>
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of John Bartow
> Sent: Wednesday, September 27, 2006 4:23 PM
> To: 'Discussion of Hardware and Software issues'
> Subject: Re: [dba-Tech] Foot switches / controls
>
> I really have no idea what you're thinking of but here's a link to a foot
> pedal that I set a music instructor up with last year, in addition to the
> music program, etc.
>
> There's a serial or USB foot pedal:
> http://www.smartmusic.com/order/accessories.aspx
>
> HTH
> John B.
>
> -----Original Message-----
> From: dba-tech-bounces at databaseadvisors.com
> [mailto:dba-tech-bounces at databaseadvisors.com] On Behalf Of JWColby
>
> Does anyone know of an inexpensive foot switch or better an analog
> (potentiometer) foot pedal?  I can find them as part of game controllers 
> but
> I really want just the pedal part.
>
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