Quote:
Originally Posted by Qbot2640
Every year we get into a situation where we need to speed-control a motor in some prototyping system and I always say I'm going to build some simple control circuit. I have limited electronics knowledge (enough to be dangerous) and I have found a simple circuit called: "Square Wave Signal Generator with Pulse Width Modulation". The circuit
http://www.rmcybernetics.com/project...generator2.htm
allows variable control of the frequency (which I understand needs to be 15kHz for controlling a Jaguar) and the pulse width.
Will this do what we need? (By that, I mean, can we connect the Jaguar pwm input to this generator and control motor speed without needing our control system?) |
The Jaguar PWM input is not 15khz. The input PWM is defined in the Jaguar Datasheet, available from VexPro (it's called servo style speed input).
Quote:
Originally Posted by Qbot2640
What is a "3S Lipo" and / or a "UBEC"
Can I not just create 5VDC from a stock adapter, or from a bank of batteries?
|
3S Lipo is a Lithium Polymer battery popular with RC hobbyists. Use a Robot Battery instead. UBEC is a Universal Battery Eliminator Circuit, in other words, a 5v converter.
If you want to buy, like ILAMtitan said, you can find many options at any hobby shop (usually called a servo tester). If you want to support FIRST vendors, here are a few other options, with varying capabilities.
http://www.andymark.com/product-p/am-2732.htm
http://www.andymark.com/product-p/am-2503.htm
http://robotlogic.com/wp/product/servo-tester/
Several people have posted circuits on chiefdelphi. I've never seen one with a 555 and a comparator, I usually see them with 2 555s. You could even use a really old computer:
http://www.chiefdelphi.com/media/papers/2702