Author Topic: General questions about the 40$ robot!!!  (Read 1776 times)

0 Members and 1 Guest are viewing this topic.

Offline mohamedTopic starter

  • Full Member
  • ***
  • Posts: 88
  • Helpful? 0
General questions about the 40$ robot!!!
« on: February 23, 2008, 08:38:23 AM »
now i have complete the circuit of the 40$ robot but i want to ask  questions
1.do i have to adjust the 20k preset?
2.could i use 2 6v dc motors instead of the 12v or not?
3.how can i reduce the speed of the motors?
4.my motors move in opposite direction to each other,what wrong did i do,and how to fix this?
thanks for your help.... :)
« Last Edit: February 23, 2008, 04:47:12 PM by mohamed »

Offline airman00

  • Contest Winner
  • Supreme Robot
  • ****
  • Posts: 3,653
  • Helpful? 21
  • narobo.com
Re: General questions about the 40$ robot!!!
« Reply #1 on: February 23, 2008, 07:50:29 PM »
1. you adjust the preset to change something ( read the tutorial to find what), if the bot works fine the way it is , dont touch it.
2. The 6V motors would go faster than they are supposed to at 12V and will be handling 200% what they are supposed to be handling, they will probably break. If the 6V motors are getting 6V then its fine, if they are getting 12V its bad
Check out the Roboduino, Arduino-compatible board!


Link: http://curiousinventor.com/kits/roboduino

www.Narobo.com

Offline mohamedTopic starter

  • Full Member
  • ***
  • Posts: 88
  • Helpful? 0
Re: General questions about the 40$ robot!!!
« Reply #2 on: February 24, 2008, 08:45:25 AM »
ok first thanks for your reply.....
second about the high speed of the motors can i attach 340 ohm resistors in series with the motor to reduce the speed or that would be wrong?

Offline Pratheek

  • Contest Winner
  • Robot Overlord
  • ****
  • Posts: 125
  • Helpful? 3
Re: General questions about the 40$ robot!!!
« Reply #3 on: February 24, 2008, 09:48:57 AM »
3.how can i reduce the speed of the motors?
There are many techniques to control the speed of a DC motor and Pulse Width Modulation(PWM) is the most popular. In this technique the motor is switched on and off continuously to control the speed of the motor. For PWM you don't need to depend on microcontrollers, you can use a 555 timer. For more information, Google search "Pulse Width Modulation using 555 timer".

my motors move in opposite direction to each other,what wrong did i do,and how to fix this?
To make both your motors move in the same direction, interchange the connections of the motor, which is rotating backwards, in the L293d.
« Last Edit: February 24, 2008, 09:53:46 AM by Pratheek »

Offline Portugal

  • Beginner
  • *
  • Posts: 6
  • Helpful? 0
Re: General questions about the 40$ robot!!!
« Reply #4 on: July 07, 2008, 08:29:47 AM »
4. - You may connected wrong the motor wires. For example, in one of the motors, you could connected the wires ( like + and - , and in the other motor you could put - and +), it can change the direction of the motor.




(P.S. - I'm Portuguese)

 


Get Your Ad Here