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I'm trying to control a fan on my Arduino Due board with Arduinos own motor shield and I have encountered a problem. I want to send a PWM signal to my fan, and here comes the problem, pin 3 is channel less..

What I can find there is no channel for digital pin 3?

The code works, I have tested it with other pins and I get the requested value when I measure it on a multimeter.

In Due's datasheet there is not a single thing about it. On the motor shields webpage did I find that pin 3 is the one to use and on Arduino Uno it works great.

There is also a way to use digital pin 11, but it's the same here, no channel.

Does any one have a solution or answer way it's this way?

bytecode77
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Yllemanen
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  • Well, it should work. Have you set the output to analog out? Maybe you can post relevant parts of your code? – qwerty_so Mar 20 '15 at 23:16
  • @ThomasKilian I solved it by cutting digital pin 3 of the motor shield and drag a wire from another digital port on the arduino to pin 3. It works but is a cheap solution. I did find out that you can emulate a sinus wave with a timer that is connected to digital pin 3 on the arduino, but this is a little more complex. In the datasheet it says that PC28 control PWM, table 39.2! I will put out exactly how I did it in a couple of days when I have time for it. – Yllemanen Mar 22 '15 at 08:17

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