For the cost, this is fine, but don’t expect anything even comparable to a real LCR meter. If you want useful results, you need to be measuring the inductance at the frequency and current you’ll be using the inductor with. I assume that this project uses a frequency low enough that the parasitic capacitance won’t be an issue, but this also means that your mesurement results will be poor.

This is a good way to get a ballpark figure for getting a ballpark figure for inductance, but if you want good results, get a real LCR meter.

He says on the website: “if you’ve taken a statistics class – most capacitors with 10% tolerance will be well under 10%.”

Things are actually a bit different. The bell curve may be narrow so that within 3% you get 99.x % of your parts, but where the peak of the bell is varies in time during production, so that the parts produced over a long time can be within say 10% tolerance.

He is also forgetting to add out the other sources of errors which might bring it up to 15%.

And, just like some previously seen arduino projects, he misses the already existent internal comparator…(in some other cases built in SPI interface, USART etc)

“He says on the website: “if you’ve taken a statistics class – most capacitors with 10% tolerance will be well under 10%.”

Things are actually a bit different. The bell curve may be narrow so that within 3% you get 99.x % of your parts, but where the peak of the bell is varies in time during production, so that the parts produced over a long time can be within say 10% tolerance.”

Actually there may be another reason why the statement isn’t true. The question you have to ask is where do they get +-5% capacitors from? How do they produce +-1% devices that makes them more accurate from the others? Explanation in this funny article (well worth a read) – http://www.edn.com/article/509250-7_solution.php

Let’s just go ahead and admit that this is more or less useless, and has been done and published a thousand times over (here and elsewhere)…

elmcie