Search found 8 matches

by ProboticsAmerica
Tue Jul 03, 2007 3:55 pm
Forum: Robotics
Topic: Wanting to jump into robotics
Replies: 1
Views: 2131

What's first

I think it all depends on what you want to do. If you want to test a bit and play with different concepts for sensory/movement/reaction and autonomous or near autonomous a Mindstorms kit is fine. If you want to use a computer or complex programming languages to drive tasks and/or do things with heav...
by ProboticsAmerica
Tue Nov 07, 2006 5:09 pm
Forum: Robotics
Topic: Go Carts and Servos
Replies: 27
Views: 15069

RC & Driver control

Have the driver operated steering wheel and shaft attached solidly to the other steering components. Use a slipping connection between the motor and the shaft or a slipping connection between the drivers steering system and the motor. When I say 'slipping connection' I mean a connection that connect...
by ProboticsAmerica
Sun May 22, 2005 1:35 pm
Forum: General Discussion
Topic: resistance soldering
Replies: 7
Views: 1557

Re: resistance soldering

Sounds like the Spot Welders there have the best ideas, but if you do want to avoid the contact issue in other projects, American Beauty resistance soldering equipment uses carbon pliers on all of their larger units. Not sure if its the answer but it might be worth trying. FYI, Their smallest units ...
by ProboticsAmerica
Fri May 20, 2005 4:25 pm
Forum: Robotics
Topic: Servo controller "two switches"
Replies: 3
Views: 3047

Re: Servo controller "two switches"

Or you could go with a modification of one of the following - no programming at all in some cases, just use a 555 and a couple of transistors: <p> http://www.uoguelph.ca/~antoon/gadgets/servo2.htm <p> http://www.uoguelph.ca/~antoon/gadgets/servo3.htm <p> http://www.uoguelph.ca/~antoon/gadgets/servo4...
by ProboticsAmerica
Fri May 20, 2005 4:19 pm
Forum: General Discussion
Topic: Servo motor drive voltage
Replies: 10
Views: 2699

Re: Servo motor drive voltage

I checked the oscilloscope and its actually not a 50% pwm - its a hard 3v. When the motor kicks in it sends PWM pulses up (more positive) on one side and down (toward ground) on the other. It does this when the motor is in the circuit or removed. <p>What does 'hover' mean in this context? I took it ...
by ProboticsAmerica
Thu May 19, 2005 6:37 pm
Forum: General Discussion
Topic: Servo motor drive voltage
Replies: 10
Views: 2699

Re: Servo motor drive voltage

Ah - ok, The circuit I'm working on is not necessarily an H-bridge, but it probably contains similar either circuitry or programming. Its the chip inside a Hitec servo. The chip directly drives the motor movement. Unlike an H-bridge, the voltage applied to the motor's positive and negative poles is ...
by ProboticsAmerica
Thu May 19, 2005 3:03 pm
Forum: General Discussion
Topic: Servo motor drive voltage
Replies: 10
Views: 2699

Re: Servo motor drive voltage

Thanks Gorgon!<p>Just to make sure I understand. In all places not stated voltage measurements are relative to common (non-motor) ground:<p>Condition 1) Input 1 to motor is +3, Input 2 to the motor is +3 <p>Command to move one direction comes in: Average positive charge rises on side one, the driver...
by ProboticsAmerica
Thu May 19, 2005 10:32 am
Forum: General Discussion
Topic: Servo motor drive voltage
Replies: 10
Views: 2699

Servo motor drive voltage

The chip driving the motor inside a Hitec 422 and 300 series servo never sends zero voltage (short to ground) to the motor. At a full stop it provides (given a five volt source) +3 (relative to the input ground) to one side of the motor and +3 to the other side of the motor. Since there is no differ...