Wayfaring Stranger
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Use Higher Resistance Than Instructed in a Circuit
3 votes

If the resistor is in series w the LED, it'll just be about half as bright when you use 510 vs 270 ohms. I=E/R and all -> half the current. Your PWM will still work, but starting from a lesser ...

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Using multiple laptop battery packs to power everything
3 votes

I'd be cautious about hooking them in parallel. According to ADAfruit power leakage between batteries is a problem. [multipack parallel] ... batteries are assembled by a company that is experienced ...

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How to trigger an alarm when toilet paper is low?
3 votes

I built a reflectance tachometer for an Arduino that'd probably solve your problem. The basic circuit is quite simple: I had a photoransistor laying around that responded well to red light, and ...

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Serial port /dev/cu.usbmodemfa131 vs /dev/cu.usbserial-A702NY8S
2 votes

Drivers are different. On older boards, such as Duemilanove you may need to actually download serial drivers to talk to them at all in Lion, Mountain Lion, Mavericks. There's some discussion of that ...

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Cannot upload program to Arduino Duemilanove w/ Atmega328
1 votes

You may have wrong port: /dev/tty.usbserial-A9007LXq works with Duemilanove on my Mac.

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