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Author Topic: creating code for a square wave output and sine wave output  (Read 822 times)
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basementjacks
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« on: February 18, 2013, 10:18:54 am »
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hi im just wondering about finding code to create a square wave output  and a sine wave input&output for the Arduino UNO rev3. i need to measure the voltages and currents going in and out of the board with an oscilloscope and signal generator. any help would be greatly appreciated
« Last Edit: February 20, 2013, 06:27:14 am by basementjacks » Logged

KeithRB
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« Reply #1 on: February 18, 2013, 10:46:18 am »
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Since the UNO has no DAC output, a sinewave is kind of tricky. You can filter the PWM output, but it might not be very clean.
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AWOL
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I don't think you connected the grounds, Dave.
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« Reply #2 on: February 18, 2013, 10:56:07 am »
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I hope your lecturer isn't a member here - many are   smiley
You can build a four or five bit DAC easily with an R-2R resistor ladder (useful Google search term)
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DuaneB
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« Reply #3 on: February 18, 2013, 11:29:57 am »
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For generating output waveforms you should try Direct Digital Synthesis, this project uses it for the waveforms you mention and also has some useful links -

http://rcarduino.blogspot.com/2012/08/the-must-build-arduino-project-illutron.html

Duane B

rcarduino.blogspot.com
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Read this
http://rcarduino.blogspot.com/2012/04/servo-problems-with-arduino-part-1.html
then watch this
http://rcarduino.blogspot.com/2012/04/servo-problems-part-2-demonstration.html

Rcarduino.blogspot.com

basementjacks
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« Reply #4 on: February 19, 2013, 09:10:45 am »
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Quote
You can build a four or five bit DAC easily with an R-2R resistor ladder (useful Google search term) 

is there a way to do it using the circuit i already have for my project? the schematic is below
  http://www.instructables.com/file/F6DPG7PGZMIUHMJ 
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