I have just completed construction on my first Arduino project, an electronic dice roller. Before installing a battery and powering up, I thought it would be a good idea to do some basic checks to rule out a short which might blow everything up, so the first thing I did was to check for continuity (hoping to find none) between the ground rail and the 5V power rail. Strangely, what I get is a momentary beep on the meter -- suggesting that somehow there is a short which only exists for a fraction of a second when I first touch the meter probes to one contact or the other. Unlike what I would expect if a connection were shorting out, the beep is not continuous.
Sorry for my ignorance, but I'm new to this: Where would I put the capacitor
what would this test tell me?
You will see a momentary low resistance as the caps on the board go from discharged to a charged state from current injected by the meter. I would expect that design would eventually get up towards 10s of Ks of resistance.
Posted by: CrossRoadsYou will see a momentary low resistance as the caps on the board go from discharged to a charged state from current injected by the meter. I would expect that design would eventually get up towards 10s of Ks of resistance.
Posted by: CrossRoadsYou should also add 0.1uF cap from Vcc pin to Gnd of each shift register.
IAnd what would this imply as to why I am getting the momentary continuity without the capacitor? Or would it suggest that the momentary short is not really a problem?
I had tried this in the breadboard stage. What I found was without the caps, it worked fine; when I added them, thigs started generally behaving very strangely.
So I took the "Don't fix it if it ain't broke" approach.
..... so that I can follow the tutorials available without knowing what I am doing...
// posting code here
Well, I win the idiot of the year award!