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No dc ouput on motor shield terminals
Moderators: adafruit_support_bill, adafruit

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No dc ouput on motor shield terminals

by chrisgrant72 on Mon Jan 24, 2022 3:13 am

Please help,
Im 100% sure everthing is wired correctly see photos , arduino is receiving code and blink test is working ( BTW im a newby at this) Fan are not faulty polarity is correct. The adafruit is a V2 and Arduino uno R3 . IDE LIBRARY: MOTOR SHIELD V2 is installed on adafruit. Only issue I can see is a message displayed at bottom right corner after sketch is loaded saying "could not connect to serial port Error. Timeout after 1000ms.
DC motor test does not work no Voltage on motor terminals at all. been going at this for 3 days now and no luck, Pleeeasse help for my sanity!!
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chrisgrant72
 
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Re: No dc ouput on motor shield terminals

by adafruit_support_bill on Mon Jan 24, 2022 6:27 am

Please post the complete code you are using. Also please tell us what kind of Arduino you are using.

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Re: No dc ouput on motor shield terminals

by chrisgrant72 on Mon Jan 24, 2022 8:39 am

Arduino UNO R3 and the example DC motor test in the IDE . If I remember right ( it’s late and I’m in bed) tools>examples>adafruit>dc motor test .
Thank you.

Ultimately I’m going to use it in Simhub as a wind simulator

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Re: No dc ouput on motor shield terminals

by adafruit_support_bill on Mon Jan 24, 2022 8:45 am

OK. The power indicator LED is on and the wiring looks correct for that sketch.

What motor are you using?

Also, try running the i2c scanner code here and post the results: https://playground.arduino.cc/Main/I2cScanner/

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Re: No dc ouput on motor shield terminals

by chrisgrant72 on Tue Jan 25, 2022 2:49 am

The result was:
Not connected. Select a board and a port to connect automatically.
SCANNING....
No I2C device found

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Re: No dc ouput on motor shield terminals

by adafruit_support_bill on Tue Jan 25, 2022 6:22 am

What motor are you using?

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Re: No dc ouput on motor shield terminals

by chrisgrant72 on Tue Jan 25, 2022 7:16 am

12v dc 1.4amp fan

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Re: No dc ouput on motor shield terminals

by adafruit_support_bill on Tue Jan 25, 2022 7:27 am

The drivers on the shield are only rated for 1.2A.

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Re: No dc ouput on motor shield terminals

by chrisgrant72 on Tue Jan 25, 2022 7:53 am

But there would still be a voltage across the terminals in test mode wouldn’t there?
My multimeter is not picking up any voltage at all on all 4 motor terminals with or without a motor connected

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Re: No dc ouput on motor shield terminals

by adafruit_support_bill on Tue Jan 25, 2022 8:02 am

The "No I2C device found" indicated a problem communicating with the shield. If you contact support@adafruit.com with a link to this thread we can replace that for you.


But there would still be a voltage across the terminals in test mode wouldn’t there?

Not if the drivers were fried by an overload. Running that fan at 12V risks burning out the drivers. You could probably safely run it at 9 or 10V.
Another alternative is to use a driver with higher current capacity: https://www.adafruit.com/product/3190

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Re: No dc ouput on motor shield terminals

by chrisgrant72 on Tue Jan 25, 2022 8:09 am

Ok I’ll buy another board and test it without a load on the output motor terminals to check for a voltage with the program I intend to run on it

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Re: No dc ouput on motor shield terminals

by adafruit_support_bill on Tue Jan 25, 2022 8:34 am

No need to buy a new one. Overload is not the immediate cause of the problem. As I said in my previous post, since there is no i2c communication, we can replace it:
The "No I2C device found" indicated a problem communicating with the shield. If you contact support@adafruit.com with a link to this thread we can replace that for you.


Just don't try running that fan at 12v using the shield.

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Please be positive and constructive with your questions and comments.