I expect the author of "no need to separate" meant that the 2 wires could be run side by side and would not need separation to prevent crosstalk.

Sure, that should work. I think you'll find it convenient to have some way to turn it on and off

@dronebot-workshop re: the "too fragile" micro-USB connector. You absolutely must mount the nano board on a bit of a stand-off so that there is 3 ...

@hayttom History repeats itself. Years ago I had a similar problem using PLC's. Two machines, nominally identical except for some calibration num...

@garnold Let me know if you have a problem opening it. I'm still fooling around with putting drawings into replies

Here's the graphic method.

The 3v you mention is the approximate voltage across the LED. The voltage across the resistor will be the supply voltage you use minus 3v and the res...

@codecage That link looks like a scam to me. If it's not, Idon't want to be carrying around the amount of stored energy that it implies.

@jeffed Interesting--Every once in a while new minerals are found, particularly in uncommon environments,

@jeffed & strongheart Suppose this had been the battery in an electric car and it was damaged in an accident. What would be the result ...

@fpeter3 Just an amusing observation re clean track. Many years ago I was trying to track down a problem in a real, full scale locomotive which h...

@anibal PID seems to be the sexy term but I'm not very enthralled by it. I grew up using loop gain or crossover of the bode diagram and a lead or t...

P I D mean proportional, integral, and differential. The idea is popular because the concept appears to be intuitively simple but when you try to us...

@zoolandermicro I've used this stretching method to straighten copper wire on the job and it works nicely. It only takes a short stretch, an inch o...

@frogandtoad I first ran into "steppers" in about 1962 or 63 and I wasn't quite sure what they were and didn't have much to do with them afterward. ...