I take your point, but I was completely new to all of this in Jan 2017. Had never designed a PCB or for that matter ever heard of a 555 timer! Didnt know Arduino existed until March and still dont know what all the capabilities it offers. In Jan., just wanted to have a timer that powered an LED for 10 seconds. I knew a resistor and a large capacitor would do that but the cap would be too large! Since you cant buy just 3 of anything on Amazon I had all these left over components. I decided to make cool flashers and timers for my 9 grandkids! Its been fun and enjoyable to design the PCBs and then see them work! I now know something about 555, 556 timers, how to make different timers or a flasher, more about LEDs than I needed, Fritzing and sites like this one. Before January I had no clue to any of this.
Do you have any idea how tedious it was to put a PCB timer-flasher with a 556 and fit it in a plastic case 2 x 2 x 3/4 inches, drill drill 14 holes for he switch wires,have adjustable flash rate, switches to choose the color of the RGB led, have it flash or not, have it stay on for 1 or 8 minutes, indicator LED so they will know its on, all with my big fingers, each one took a full day! One of the grandkids took it to a "show and tell" in class and was asked by many of his classmates, "can your grandfather make me one" dont think an Arduino would have elicited the same response.The smile on his face telling me about it was worth every minute of tedium!
But since you have just schooled me to what an Arduino can do, rest assured I will check it out, thank you!
WHAT I HAVE DONE SINCE JANUARY, besides the initial project of the three flashers :
3" sq. NIGHT LIGHT, big fingers were not a problem! OH ALSO DIDNT KNOW THERE WAS GLITTER NAIL POLISH TO COLOR THE LED SWITCHES!
2X2X3/4 INCH TIMER-FLASHER done with huge fingers!
3 x3 21/2 inch TIMER
TO QUOTE FRANK LLOYD WRIGHT " FROZEN MUSIC"
thanks again for your suggestion, will look into an Arduino.
Cant burn my finger with a soldering iron if I had used an Arduino!