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you could switch the UPS power (outlet/battery backup) with a simple relay if you really need two-stage backup.
no, it was everycircuit http://everycircuit.com/app/ the free version has a limit of 5 components though, to it's pretty useless.
Here you can see first the wannabe square wave from pin 13, then me unplugging the wire from pin 13 and connecting it to 5V. I think it needs a little calibration... Can anybody help me?
Ok, I made it work.It was looking for the Arduino on /dev/ttyS1, but it was on /dev/ttyUSB0 so I just made a symlink! #sudo su#rm /dev/ttyS1#ln -n /dev/ttyUSB0 /dev/ttyS1
Also, it doesn't really seem to work propperly for me. Instead of the test square wave it shows me kind of a sawtooth or a trangle wave. Do i have to connect REF or VIN to a stable voltage like 3v3 or 5v? Sorry I've had an arduino for like a week :)
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