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Spockie-Tech
Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
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Connect the bottom right 3 boxes in your diagram.
Thats about as much detail as can be given right now based on your "Axe Control" and "Chip" (for your speed controller) diagram.
Presumably your Axe control will be some form of relay h-bridge or reversible electronics speed controller (ESC). your 12v battery will connect to it, and your "chip" will be some other sort of two-channel reversible speed controller. your 7.2v battery would connect to that.
Although I dont like your chances of finding a suitable reversing dual channel speed controller that runs well at 7.2v. Most Hobby Car ESC's only go in one direction, or have a fixed power reverse, or a reversing delay or something that screws up using them for a robot.
You could maybe make a relay hbridge and put a one directional hobby ESC underneath it, but you will still need mixing etc.
And your Axe ESC will need to be able to handle the stall current of your weapon motor, which will proably be well above most hobby ESC's as well (unless you are planning on swinging a doorknocker instead of a hammer)
A simple rule to remember when it comes to robots = precise control of high power motors = Big $. There is no way around that that we know of yet.
So First, pick your budget, then pick your motors, batteries and speed controller to suit, then we can help you with wiring diagrams
7.2v is a silly voltage to run any decent size robot on anyway. RC Cars only use it because they're very small and light and cant afford to carry many cells (batteries inside a pack). At that voltage, the tiniest inefficiency (excessive length, poor connection etc) in your wiring will cost you gobs of your power, and your ESCs will get very hot trying to push enough current to make any power in the first place.
12v is a minimum for for most robots, and you will find most of us are running 18-36v in our robots. power is much easier to make with higher voltage. dont choose some cheap 7.2v hobby motors and then try and build the robot around them. _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
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Tue Feb 27, 2007 9:29 pm |
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