Yeah and Thank you TOO Sir for posting the reference. I have seen people here argue that they can't see what it could possibly affect and therefore was NOT Necessary..., Was a guy trying to light 59 led's off the usb port supply voltage across three boards without ANY supply bypassing who said that it had to be the sketch that someone else had written and he was CONVINCED that it was the sketch that was at fault and not the HEAVILY SUGGESTED bypassing... He did later change his "tune", after he had added the recommended parts... I think that everyone here who posts a question about erratic operation of sketches should be required to read that reference, before posting questions. Breadboards ARE EASY to USE and are VERY EASY to ABUSE with. They are easy to put components on and test with... BUT THEY DON'T really reflect the real world. When I did this stuff for a living I breadboarded all that I did and Many times what I needed to do when breadboarding was "Fix" or "Compensate" the operating conditions imposed by the breadboard. Typically I needed 50% of the bypassing and other compensation when I made the actual circuit board. This is a Very Hard subject to understand. It would be much better for the "NOOBS' here to simply follow the "Pretty pictures" and later understanding may take place. When I design something it is from a FOUNDATION of knowledge that I acquired over many years... I know what will be needed to make a given device work, If I don't, I have the knowledge to figure out after measurement what I need to do to make the device operate as I intended... I cannot yet really write a sketch with any real degree of confidence But I Can Engineer. Unlike many here I am here to learn how to write sketches and later the underlying Code processes to create my desired projects and since I am retired... I have a bunch... some worthwhile and most simply for the education. I have all my life had a BOOK either in my hand or very close to me... I have over 200 data sheets... so far in my parts library and the number grows daily. My life today is learning all I can and occasionally passing on what is relevant.
Doc