Re: Choosing RC Servo Controller

John Mianowski wrote:
On Jul 15, 8:24 am, rgagarr...@xxxxxxxxx wrote:
Hi,
I hope this is the correct group for my enquiry.

I need to integrate an RC servo motor into my project and I'm trying
to find the best way to control it. I'm unable to generate the PWM
control signal myself so I'm need to buy a servo controller. I don't
have any serial comms available, however, only digital IO lines.

You could control an RC servo by wiggling a digital IO line up and down in the right fashion.

only servo controllers I've found so far are controlled via 232 (or
USB) - does anyone know of any controllers that I could control with
digital IO? For example, one pin to turn movement on/off, one pin to
set direction. Something simple like that. I've got sensors that
provide position feedback so I know when to stop the movement (but I
don't necessarily know exactly where that position will be).

Any help would be much appreciated!

Hang on lets take a step back. It sounds more like you could use a stepper motor driver than a servo. What are you trying to do?

It's pretty easy to generate PPM (not PWM) signals to control a hobby
servo with just a 555 & a couple of resistors & capacitors. A
potentiometer can be used to vary the pulse width. It's also pretty
easy to do with any microcontroller. What kind of "digital IO" do you
have in mind?

Google "serial", "servo", & "controller" for a huge selection of OTS
products.

Although a bit of software could generate the right waveforms.

ISTR Nominally 50Hz rep rate with a 1-2ms pulse to indicate requested position. Plenty of hobby PIC based sample code out there.

Regards,
Martin Brown
** Posted from http://www.teranews.com **
.

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