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Related

Weird Problem

dirtdiver
dirtdiver over 13 years ago

I cant find the problem here!

I have a motor hoocked up like shown in the tutorial motors and transistirs, I have a code turnin a PWM pin  high and low  (them i tried with 0 and 255, if there is even a difference)

 

 

 

void setup() {               

 

 

  pinMode(5, OUTPUT);    

}

 

 

void loop() {

  digitalWrite(5, HIGH);  

  delay(1000);             

  digitalWrite(5, LOW);   

  delay(1000);             

}

 

I have 5 volts-0 Volts changing within a second, but when i connect the motor it stays at 0 volts

I hoocked up an LED and it works fine

The motor is not baked, i tried it by connecting it directly to 5 volts and it rotates.

The transistor i used is rated for 1A collector current.

Any ideas where the problem might be?

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  • YT2095
    YT2095 over 13 years ago in reply to Anonymous-58970 +2
    my circuit works perfectly with the 4k7, I`v just drawn it out for you here: it`s not perfect and may need magnifying a little? but it works great (I have a board with 8 of these on that have been working…
  • YT2095
    YT2095 over 13 years ago +1
    exactly as Pablo said, and you MUST use a resistor from the Arduino pin to the Base, otherwise you have a direct current path from your arduino pin to a power rail, and this can easily destroy that port…
  • mcb1
    mcb1 over 12 years ago in reply to YT2095 +1
    For YT2095 Your circuit works with a 4k7 because the relays don't require as much current as the motor. The 2N2222A 2N2222A has a gain of about 100. That means that if the Base to Emitter current is 1mA…
Parents
  • ntewinkel
    0 ntewinkel over 13 years ago

    Here's the Oomlout tutorial, which provides a pretty clear schematic too. Assuming you're using a different tutorial, this might help by giving another angle on it.

    http://www.oomlout.com/oom.php/products/ardx/circ-03

     

    Cheers,

    -Nico

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  • Anonymous-58970
    0 Anonymous-58970 over 13 years ago in reply to ntewinkel

    if that 2.2k miht be the problem i was told 1k resistor  if ur using a 2.2k switch it to 1 k 1/2 watt and i think 1/4 watt be the same

     

    i getting in to arduinos myself so far i know is the 1k resistor is widly used for controlling a transistor

     

    Message was edited by: Pablo Garcia

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  • Anonymous-58970
    0 Anonymous-58970 over 13 years ago in reply to ntewinkel

    if that 2.2k miht be the problem i was told 1k resistor  if ur using a 2.2k switch it to 1 k 1/2 watt and i think 1/4 watt be the same

     

    i getting in to arduinos myself so far i know is the 1k resistor is widly used for controlling a transistor

     

    Message was edited by: Pablo Garcia

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