Marc, How to Build a Jumbo Servo. WARNING: I have not personelly performed the following procedure, attempt at your own risk!
Get the following two items: http://www.lynxmotion.com/Product.aspx?productID=648&CategoryID=10 http://robotpower.com/products/simple-h_info.html 1. Connect the two motor outputs of the Lynxmotion board to the PA and PB inputs on the RobotPower Simple-H board. 2. Mechanically attach a 5K feedback potentiometer on your wiper motor output shaft. 3. Wire the potentiometer to the Lynx board as shown here http://www.lynxmotion.com/images/jpg/shb01.gif 4. Connect the "-" input on the Simple-H board (PWM signal ground) to the ground of the 5v supply to the Lynx board (you can tap into the black wire on the yellow, red, black ribbon cable supplying the Lynx board). For the following steps refer to page three of the Simple-H product manual (the "H-Bridge Connection" diagram). http://robotpower.com/downloads/Simple-H-user-manual.pdf 5. Attach the wiper-motor leads to the M1 and M2 connections on the Simple-H board. 6. Connect your 12v source to the B+ and B- connections on the Simple- H board. 7. Plug the Lynx board into your R/C receiver. 8. Plug your receiver into a 5v power source. You know have a high-power jumbo servo! FYI, the Lynx board is just the circuit board from a Hitec servo. You can use a board scavenged from any servo. The Simple-H board is just that, a simple H-bridge. You can configure your own H-Bridge from discrete components such as 4 D1D40 SSR's. Steve Tyng On Jan 12, 2:49 pm, Marc <[email protected]> wrote: > > I am confused here. are you trying to build a jumbo-rc servo? > > I can't get my head around this servo-hack thing, how much I try. > > I'd like to build a petrol powered wheeled vehicle, have the drive > line parts nearly complete and the only thing holding me back is this > steering servo issue. The more info I find on the web, the harder it > seems to understand (for me, that is). > As I understand the schematics in this topic are based on another > principle? > > The contingency plan is to hook the old MAG speed control up to a > wiper motor but this is not the ideal approach as it is not self > centering, a bull in china shop method. > > So there we go: > > I found a description (I think through a post in this forum, but am > not able to retrieve the post) that explains hacking the S3003 servo. > I get those instructions. Disconnect servo motor, remove mini > capacitators and solder new wires from the servo board. > > Clear. > > I get the part about the servo potmeter connected to the motor arm for > position feedback. > > Now: > > - Where do these new wires lead to? Is this the H-Bridge? > - Is there a schematic available for a proper H-bridge that can be > used to operate a 12 V wiper motor? > - How do I hook this all up together? > > Any information is appreciated. Or easier methods :-) > > Thanks! > > Marc
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