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Author Topic: IGNORE!!! READ MY OTHER POST THIS IS A STUPID QUESTION  (Read 1124 times)

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Offline XyverTopic starter

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IGNORE!!! READ MY OTHER POST THIS IS A STUPID QUESTION
« on: March 10, 2010, 06:27:50 PM »
I've made my 50$ robot, and I am now trying to program it.  I've been messing around with the light sensors I made and Arduino and servos and such, and i know how to make it that a different amount of light will turn the servo at different speeds.  The problem is, I don't think its sensitive enough.  It goes one speed in the light, but to make it slow down/stop, I have to entirely cover the sensor in my hand.  

How can I make it more sensitive?

Before I modified the servo i tested the same thing, and by waving the sensor around the motor would twitch to different positions. So it does work, unless I screwed up on the modifying.

Another thing, I was reading through this post http://www.societyofrobots.com/robotforum/index.php?topic=2724.0 and saw the numbers    23/.992*(time in milliseconds) = number of cycles .  Where does the 23 and the .992 come from???  Would it be different for an Arduino?
« Last Edit: March 10, 2010, 08:40:53 PM by Xyver »

Offline Razor Concepts

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Re: Magic numbers with arduino?
« Reply #1 on: March 10, 2010, 07:01:05 PM »
Please post your code.

Offline XyverTopic starter

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Re: Magic numbers with arduino?
« Reply #2 on: March 10, 2010, 07:47:44 PM »
I've just been messing about with the practice codes on the Arduino website for potentiometers controlling servos.  Here it is:

// Controlling a servo position using a potentiometer (variable resistor)
// by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>

#include <Servo.h>

Servo myservo;  // create servo object to control a servo

int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin

void setup()
{
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
}

void loop()
{
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180)
  myservo.write(val);                  // sets the servo position according to the scaled value
  delay(1.5);                           // waits for the servo to get there
}

Offline Razor Concepts

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Re: Magic numbers with arduino?
« Reply #3 on: March 10, 2010, 08:03:54 PM »
You will have to mess around with the values. The example arduino code assumes that the input sensor will range from 0 to 5 volts, however the light sensors probably output a range smaller than that. In the map() method, increase the value of the 0 and decrease the value of the 1023 to shorten the range.

 


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