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Old 06-23-2010, 12:40 AM #1
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Default Drawing circumference

Hi,
I assembled a SCANLSP20 and I'm using an arduino to control it. My problem is drawing circles they come out with som pointy edges like the ones in the photo


Does anyone know what is happening? Can you help me please?


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Old 06-23-2010, 01:37 AM #2
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Default Re: Drawing circumference

My car sounds funny. Can you tell me what is wrong with it?

Seriously, though, it looks like the problem is in your Y. So check for funny business there.
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Old 06-23-2010, 01:39 AM #3
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Default Re: Drawing circumference

...I was wondering if any one has had the same problem, and if they have, how did they solved it...
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Old 06-23-2010, 01:49 AM #4
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Default Re: Drawing circumference

Have you scoped your arduino output to verify you are sending proper signals to the scanner amps? That would be my guess. It looks like the pulses are somewhat periodic in X time. Almost as if you have a square wave riding on your Y output. Since scanners are analog devices, that strongly suggests that the problem is not with them. So, my guess is something funky is going on with your arduino output. How are you converting the arduino output to analog voltages? Hopefully, not PWM.
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Old 06-23-2010, 01:58 AM #5
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Default Re: Drawing circumference

I don't have an oscilloscope to make a proper diagnostic from the output wave. The wave is analog it sent from a 12 bit DAC that is connected to the arduino. I'll probably try changing the DAc it might be having some output problem to the Y axis.

Thank you
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Old 06-23-2010, 02:08 AM #6
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Default Re: Drawing circumference

Oh just found the problem! It was a stupid mistake on my programming. passing a 0x1100 code to the DAC when it should be a 0x1000
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Old 06-24-2010, 04:22 AM #7
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Default Re: Drawing circumference

There are 10 types of people in this world...
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