controlling pulley speed with Basic Stamp Module

jz

I have a 5HP Briggs/Stranton gas engine....Attached to the drive shaft of this engine·is a pulley system. The system is set up as a·simple winch.

The speed·[noparse][[/noparse]RPM] of the pulley is controlled by a manual·post attached physically to the throttle lever on the Briggs/Stranton engine which can increase or decrease engine speed by changing the·post position. [noparse][[/noparse]varying RPM of pulley]

I would like to set·up the·Basic Stamp Module·to monitor the RPM of the pulley and bring it up to a pre-programmed rate. I am assuming I will need a solenoid physically attached to the throttle of the Briggs/Stranton engine which·can then change engine speed based on feedback from the measured RPM's of the pulley. I am assuming the Stamp Mod can measure RPM's, will it also be able to be programmed to vary the positioning of the solenoid and provide for an accurate pre-programmed pulley speed?

Any help would be greatly appreciated. Thanks to all in advance.

jz

skylight

A servo might be a better choice than a solenoid for this application.
edited for typo (missing r in servo)

Post Edited (skylight) : 6/18/2007 10:30:11 PM GMT

Newzed

Jz, you can not "vary" the position of a solenoid.· It is up or down.· I suggest you look into a stepper motor for your project.

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jz

ok, thanks guys! I'm assuming using other than a solenoid, the over-all design should be attainable then with the Basic Stamp Module?

skylight

Can't see why not, Using a hall effect to read the RPM and PWM output to control position of a servo.

Zoot

Have a look at this thread: http://forums.parallax.com/showthread.php?p=612409

Ken Gracey used a servo on the throttle of a gas engine, plus he hooked up a pin to the magneto so the chip could "kill" the engine (i.e. turn it off).

For counting RPMs you will probably need to use a chip like the SX -- the Stamp will not be fast enough.

p.s. -- actually, if you put sensors on the PULLEY rather than the engine itself, you might be OK with a Stamp -- depends on how fast the pulley will turn.

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jz

thanks guys!...great thread...yes, I'll go with sensors on the pulley.