adafruit motor shield won't work :(

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revs
 
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adafruit motor shield won't work :(

Post by revs »

I just bought an adafruit motor shield, and it seems to not work

I used the motortest example, checked the outgoing voltege and all I get is 15.6 mV (on all the M-outputs)

any idea?

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Re: adafruit motor shield won't work :(

Post by adafruit_support_bill »

Please post photos of the front and back of the board and we'll take a look.

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Re: adafruit motor shield won't work :(

Post by revs »

I am using 2.3 version.

the only thing I had to do is to solde the pins.

I checked them also and it's look fine
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Re: adafruit motor shield won't work :(

Post by adafruit_support_bill »

It looks like you have a few cold joints, and some where the solder has not flowed onto the solder pads. Please review this guide for tips on identifying and fixing common soldering problems: http://learn.adafruit.com/adafruit-guid ... n-problems

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Re: adafruit motor shield won't work :(

Post by revs »

could it be something else?

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Re: adafruit motor shield won't work :(

Post by adafruit_support_bill »

There is no point in looking for other problems until the soldering problems are fixed. You have one ground pin that is completely unsoldered. The other ground pin and the 5v pin appear to be cold joints and your i2c signal pins all look like cold joints as well.

If you still have problems after fixing the soldering, post photos of your re-touched soldering and the code that you are using to test.

Also post details of the power supply and the motors you are trying to use.

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Re: adafruit motor shield won't work :(

Post by revs »

OK, thank you.
I will fix the slodering problems and will let you know.

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Re: adafruit motor shield won't work :(

Post by revs »

It took me some time but I finally fixed the slodering problems, sadly that didn't helped....

this is the program I am using:

Code: Select all

// Adafruit Motor shield library
// copyright Adafruit Industries LLC, 2009
// this code is public domain, enjoy!

#include <AFMotor.h>

AF_DCMotor motor(1);

void setup() {
  Serial.begin(9600);           // set up Serial library at 9600 bps
  Serial.println("Motor test!");

  // turn on motor
  motor.setSpeed(200);
 
  motor.run(RELEASE);
}

void loop() {
  uint8_t i;
  
  Serial.print("tick");
  
  motor.run(FORWARD);
  for (i=0; i<255; i++) {
    motor.setSpeed(i);  
    delay(10);
 }
 
  for (i=255; i!=0; i--) {
    motor.setSpeed(i);  
    delay(10);
 }
  
  Serial.print("tock");

  motor.run(BACKWARD);
  for (i=0; i<255; i++) {
    motor.setSpeed(i);  
    delay(10);
 }
 
  for (i=255; i!=0; i--) {
    motor.setSpeed(i);  
    delay(10);
 }
  

  Serial.print("tech");
  motor.run(RELEASE);
  delay(1000);
}
I when I measure the output I get only 43mV

please help...
Last edited by adafruit_support_bill on Tue Sep 30, 2014 8:38 am, edited 1 time in total.
Reason: Please use the '</>' button when posting code. Paste your code between the [code] tags.

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Re: adafruit motor shield won't work :(

Post by revs »

The new soldering
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Re: adafruit motor shield won't work :(

Post by adafruit_support_bill »

Also post details of the power supply and the motors you are trying to use.

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Re: adafruit motor shield won't work :(

Post by revs »

I am using 9V converter
and using 3V DC motor
I have tried using 5V DC motor but that didnt work either

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Re: adafruit motor shield won't work :(

Post by adafruit_support_bill »

Which 3v motor? We need to know the electrical specifications of the motor.

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Re: adafruit motor shield won't work :(

Post by revs »

There are no spec on the motor but it's the simplest 3V motor for toys
and when I measure the voltage output I get only 43mV (on all the outputs)

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Re: adafruit motor shield won't work :(

Post by adafruit_support_bill »

and when I measure the voltage output I get only 43mV (on all the outputs
That can happen when the H-bridges are burned out. A quick way to do that is by supplying too much voltage to the motor. If you feed 9v to a 3v motor, it will draw 3 times as much current as it is supposed to.

With the motor disconnected, what is the resistance across the motor leads?

With power applied to the shield, is the green light on?

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Re: adafruit motor shield won't work :(

Post by revs »

It says 1.3 omh. (when I test the resistance between the inputs of the motor itself)
And yes the green led is on.

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