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1  Community / Website and Forum / Re: Loop Back Test - Sticky? on: March 31, 2012, 11:56:35 am
 smiley-sad
2  Community / Website and Forum / Re: Loop Back Test - Sticky? on: March 31, 2012, 11:11:04 am
haha I know I know, but spending money is last result!

and remove what chip? My arduino uno doesnt have any removable chips (that i know of).
3  Community / Website and Forum / Re: Loop Back Test - Sticky? on: March 31, 2012, 10:56:31 am
My uno suddenly stoped working.. im afraid I may have touched two wires that shouldn't have while working with it last night. Power light comes on, but the other lights dont blink like they normally would when turning on and dont do anythign while trying upload to the board... I keep getting the error "programmer not responding". My computer detects the USB and so does the arduino program... but when i tried the loop test it failed to echo back the text.... have not tried another ocmputer yet, but I tried my MEGA board on the same ocmputer and it works fine...

WTF!?
4  Using Arduino / Motors, Mechanics, and Power / Re: Multiple DC Motor Control via PWM Arduino - Mosfet getting hot!! on: January 24, 2012, 09:41:15 am
Thanks for all the great suggestions!

I haven't had a chance to try any of them yet.
I need to order the parts. It will probably be a while before I do. But I'll be sure to come back and let you know how it turns out!

Thanks again!!
5  Using Arduino / Motors, Mechanics, and Power / Re: Multiple DC Motor Control via PWM Arduino - Mosfet getting hot!! on: January 18, 2012, 07:32:43 pm
Thanks for the tips "dc42" Ill try it out!


Here are the features of the IRF9530 mosfet:
"Features
• 12A, 100V
• r
DS(ON)
= 0.300
Ω
• Single Pulse Avalanche Energy Rated
• SOA is Power Dissipation Limited
• Nanosecond Switching Speeds
• Linear Transfer Characteristics
• High Input Impedance
• Related Literature
- TB334, “Guidelines for Soldering Surface Mount
Components to PC Boards”
"


I dont know the total current draw of the motors...

I figured I'd use at least 12v to run the project since 7-12v is recommended for the arduino and since It would be sharing it with multiple 6v motors. (even though i'm not trying to run the motors at full speed.

Did I mention I don't know lick about mechanics and I'm sure that's the root of most of the problems here.
6  Using Arduino / Motors, Mechanics, and Power / Multiple DC Motor Control via PWM Arduino - Mosfet getting hot!! on: January 18, 2012, 03:17:15 pm
Hi,

A while back I posted here asking for help to run multiple motors via PWM using arduino and an ultrasonic distance sensor, and I got lots of help and suggestions!

I now have a working prototype of my project and a larger scale one is in the works. My current schematic runs, but after 30+ secs of PWM running motors my mosfet IRF9530 gets extremely hot, even with a heat sink. When the motors stop running it cools down.

I'm currently running 25 parallel 6v-DC motors, but I'm not trying to make them run fast at all, quite the opposite, my PWM is set so that they turn on and off for short periods of time, just slightly turn then stop then slightly turn and so on- almost as if the motors are just vibrating... but my final project will have 61 DC motors.

Im using a 12v power supply that plugs into the arduino and then that power adapater is split so that the 12v is shared and plugged into the breadboard. (So it may be that since the arduino is sharing the 12 volts the mosfet isn't getting actually 12v, or enough power for all the motors. - my un-educated guess)

Heres a drawn schematic that I got from someone who was helping me with this project, but now they are lost too.


and here is an image of my breadboard:


(the motors are not connected to the ground and drain of the mosfet in the picture above)

I need these to be able to run for a long period time on and off.

One idea I have is to split up the motors like 5 sets of 12 motors each one to their own mosfet (total of 6 mosfets) and to 6 individual pins on the arduino but im skeptic as to how well it would run - especially if its still shares the same 12v or even 20v.

Any suggestions or comments?

Thanks again to all those who previously helped!

Soon ill post a link to a video of my working demo.
7  Using Arduino / Interfacing w/ Software on the Computer / Controlling video frame/images by a photo sensor on: January 09, 2012, 10:45:41 pm
In this video:
It it shown that you can control frames of images/video on the computer using a sensor and arduino.
But what else would I need to do this?
What software or code is necessary to be able to control the frames of an image like that?

I really want to figure this out, and the author of that video seems to have lost his code....


Thanks,

- Arduino noob
8  Using Arduino / Displays / Re: Code to turn up and down backlight with Distance Sensor Update* on: January 07, 2012, 03:40:18 pm
Updated the original post.
9  Topics / Interactive Art / Re: interactive lightflowers on: January 04, 2012, 05:58:52 pm
awesome job!
10  Using Arduino / Displays / Re: Simple code to turn up and down backlight with Distance Sensor on: January 04, 2012, 12:10:09 pm
Let me be more specific....

I want to plug in a computer lcd monitor (15") into the arduino and have a picture shown on the screen - using a distance sensor, Id like the arduino to use the distance readings to adjust the brightness of the computer monitor from the brightness all the way down, with a specific distance, (look like monitor off, or actually turn monitor off) to brightness all the way up, with another distance reading.

Is this possible? I know with the "magic mirror kit" they are able to play flash animations on the lcd monitor using an arduino microcontroller. But i just want a still image, and then to turn off the monitor using the distance sensor.

Any help is greatly appreciated!

Thanks!
11  Using Arduino / Motors, Mechanics, and Power / Re: Need to program dc motors to stop at specific position on: January 03, 2012, 10:02:07 am
Hmm, that's what i was afraid of.....


Thanks a lot for the suggestions, i'm afraid they may be too difficult for me to configure/code... I'll check it out though!

12  Using Arduino / Motors, Mechanics, and Power / Need to program dc motors to stop at specific position on: January 02, 2012, 11:08:08 pm
Hi, I have a code that turns on/off a motor via a distance sensor. My problem is when it turns the motor off it just turns off at a random position, and I want the motor to stop at a specific spot every time it is turned off. This way the mirror that I have attached to the shaft of the motor is back in the original level position every time the motor stops spinning.

Here's the code I have that adjusts the PWM to the motor.
Code:
#include "Ultrasonic.h"

int LED1 = 9;  // LED1 Pin

int TRIG = 2; // Trigger Pin
int ECHO = 3; // Echo Pin

int Range; // The range of the object from the HC-SR04 Ultarsonic Module
 
Ultrasonic ultrasonic(TRIG,ECHO); // Create and initialize the Ultrasonic object.

void setup() {
 
  Serial.begin(9600);
  pinMode(LED1, OUTPUT);
 
}

void loop() {
 
  Range = ultrasonic.Ranging(CM); // Range is calculated in Centimeters.
  // Range = ultrasonic.Ranging(INC); // Range is calculated in Inches.
 
  Serial.print(Range);   
  Serial.println("cm");
 
  if (Range != 0 && Range <= 100) {   
   digitalWrite(LED1, HIGH);
   delay(14);
   digitalWrite(LED1, LOW);
   delay(50);
  }
 
      if (Range != 0 && Range <= 50) {   
   digitalWrite(LED1, HIGH);
   delay(20);
   digitalWrite(LED1, LOW);
   delay(50);
  }

 
}
13  Using Arduino / Displays / Code to turn up and down backlight with Distance Sensor Update* on: January 02, 2012, 12:54:35 pm
Ok, before we get into how to code my idea. Is it even possible to connect an lcd computer monitor to the arduino and control its brightness, or turn it on and off... I think for turning it on and off it should be possible by splitting the positive and ground...right!? 

I want to have an image on the lcd and eventually use a distance senesor to turn the brightness all the way up and down. ON/Off would suffice, but there will probably be a longer pause between which i would like to avoid.

Thanks for the help!
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