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stmbtwle

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Reply with quote  #11 
Well, hobby servos are pretty cheap at $7.31 a pop, cheaper by the dozen.
https://www.ebay.com/itm/Lot-MG996R-Digital-Metal-Gear-Servo-High-Torque-Upgraded-MG945-MG995-RC-Model-HM/282592919905?hash=item41cbd9c161:m:mlP3OTVUxWc22e8COh5ZRrA
Even with an Arduino nano to operate it, I think one could put it together for under $20,
https://www.ebay.com/itm/MINI-USB-Nano-V3-0-ATmega328P-CH340G-5V-16M-Micro-controller-board-Arduino/222543127037?hash=item33d09aa1fd:g:KMQAAOSwYudXGjoq

and you have a programmable unit that will accept just about any kind of input, temperature, light, or manual. One Arduino could operate several servos.

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Willie, Tampa Bay

stmbtwle

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Reply with quote  #12 
AHA!   Here's a diagram for a Ford AC/heat "blend" door actuator, with a variable position AND it's controlled by a potentiometer, no processor required.  Might be just the ticket.

Capture.jpg 

https://www.ebay.com/itm/HVAC-Heater-Air-Blend-Door-Actuator-604-213-for-Ford-Expedition-Mercury-Lincoln/272613473812?hash=item3f79077e14:g:td4AAOSwB4BaAlui&vxp=mtr


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Rick H Parker

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Reply with quote  #13 
That blend door is a servo. I was think more along the line of a fresh air vent door because the mechanical hardware would be close to this application. Possibly a drop in solution.
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Rick H Parker
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stmbtwle

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Reply with quote  #14 
As far as I can determine, the blend actuator and the vent actuator are identical, at least what I had.

I always figured it was a servo of some sort, but the question in my mind was what type. No stepper, just a simple motor drive with a follow-up circuit. I've had one apart. That's what Ford uses, and they appear to be all the same, just the control is different. GM might be a different setup.

Even a two-position lock actuator is going to need something to cut/reduce current at the end of it's throw, or it will burn up.

The question now is what is the cheapest/easiest to obtain and set up.


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Solar is like the wind. It may be free, but putting it to work isn't!
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