View Full Version : BigTroubles with Servo-control and PropStickUSB

02-10-2007, 12:39 AM
hi everbody,

BigTroubles with Servo-control and PropStickUSB

excuses if I irritate again, so:

the simpleServo3.spin program (lookat simpleServoStick1.zip) works with the Propeller-Demo-Board perfectly with 2 micro-buttons.

But, I want control the servos with the PropellerStickUSB pursue. I have cabled the PropStick on a laborCard.
look at servoTestBoard.jpg.

if i use the Stick and simpleServoStick1.spin

Result: The Servo does not run.http://forums.parallax.com/images/smilies/smhair.gif
mine distributor could not helphttp://forums.parallax.com/images/smilies/smhair.gif me by telephone. if everything has tried out
No effect.
if somebody maybe have a idea: Run 1 Servo with 2-Control-Button with the
PropStick and a my Spin-Program.

I have properly despaired, now the big Servos for my project are there,
and running with the DemoBoard and the simpleServo3.spin.

would be around every help gladly
hardware info's or source-code
Please help

Mike Green
02-10-2007, 01:16 AM
The servo ground and the PropStick ground have to be connected together and it's not clear from your schematic if that is so.

02-10-2007, 01:57 AM
You should check what You have connected to pin 12 and pin 32 - according to Your scheme you feed 6-9 volt to pin 12 and 3.3 v to pin 32. Shouldn't it be 3.3 v to both? Or even just to one of them. Are your ground connections connected to a 'common' ground?


T Chap
02-10-2007, 02:26 AM
On the switches, if those are in fact SPDT, then it is not clear what is the wiper position. I would look at it quickly and think you have 3.3V connected straight to GND in one position.

02-10-2007, 03:31 AM

thanks for your answer.

please excuse my fault.

the new as new attachment: servoTestBoard_NEW.jpg



02-10-2007, 03:52 AM
hi everbody,

excuse my second fault

now the right one



02-10-2007, 04:14 AM

Still not quite right, IMHO. (look at what figure we see of your schematic)

P01 - has extra bends; just not asthetic.
pins 9, 10 - not really connected to Gnd.
pin 11 - RESn s/b connected to downloader circuitry.
pin 12 - s/b 3.3v, no?

Possibly not all accounted for, but hopefully gets you closer to a complete schematic.

Of course, this is again, my opinion.

Harley Shanko
h.a.s. designn

02-10-2007, 06:18 AM
This is the PropStick USB, so it has the 3.3 V regulator on board and will accept 5-9 volts in on Vin (Pin 12) and generate 3.3 v at 400 ma for use elsewhere on VDD (Pin 32).· All of the EEPROM,·crystal oscillator, USB interface, etc is already on the clip.· Very nice product, I must say!

Stan Dobrowski