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31  Using Arduino / General Electronics / Small wire segments on: August 24, 2014, 12:54:17 am
If you ever want to make very small insulated wire segments, use the following 6 steps in the attached image:
In step #4, capture about 1/4” of insulation (or the amount you want) then pull the wire until you “ALMOST” pull the insulation off.
Next carefully remove the wire so it looks like step #5.
Cut the segment so it looks like that in step #6.
32  Using Arduino / General Electronics / Re: Crossover component on: August 23, 2014, 11:56:33 pm
You could make a jig:
33  Using Arduino / Project Guidance / Re: 7 Segment Flicker on: August 23, 2014, 10:18:06 pm
I can't see much, but what is this about?  delayMicroseconds(0.2);
34  Using Arduino / General Electronics / Re: Crossover component on: August 23, 2014, 09:35:37 pm
OOPS    smiley-roll-sweat
35  Using Arduino / LEDs and Multiplexing / Re: command arduino to show me which digtal pin gives output on: August 23, 2014, 08:12:52 pm
If you mean is a pin LOW or HIGH then you can always do a    digitalRead(thatPin);    on the pin in question.
36  Using Arduino / General Electronics / Re: PCB jumpers on: August 23, 2014, 07:24:54 pm
Come to think of it, if you etch the top and bottom of the PCB (assuming no platted through holes) a middle or imaginary layer can be used to satisfied the DRC using the same technique.
See image:
   - Red is bottom layer/foil
   - Grey is top layer/foil
   - Blue is the imaginary layer which satisfies DRC
   - Green is the Zero ohm resistor/jumper
   - White Xs are the VIAs which are never used
37  Using Arduino / General Electronics / Re: PCB jumpers on: August 23, 2014, 06:53:52 pm
you will never physically make
38  Using Arduino / General Electronics / Re: PCB jumpers on: August 23, 2014, 06:35:48 pm
I tried the following and it does what I need.

1.   lay down traces to accommodate the 2010
2.  place VIAs at each end
3.  place a trace on the other side to the PCB connecting the 2 VIAs.
4.  Select the Pad traces, 2 VIAs and the opposite side trace
5.  save the block in #4, call it jumper 2010Jumper
6.  load the block when ever I need to make a automated jumper using a 2010 zero ohm resistor.

DRC is satisfied since the 2 VIAs are connected on the other side.  

I helps to brain storm.


EDIT:  See example jumping over  3 - 12.5 mil traces
39  Using Arduino / General Electronics / Crossover component on: August 23, 2014, 05:03:15 pm
Make your own crossover component, see images:
#1   cut 1 more piece of Nylon/Kapton tape  than the number of wires involved.
        (I use uninsulated 30AWG wire wrap wire)
#2   layout the first wire to lead spacing needed
#3   cover the first wire with a piece of tape with the carrier removed
#4   repeat with the second wire
#5   complete all wires until you are finished
#6   form the wires and cut to length, I usually leave 1/10” overhang
#7   take off the protector of the first piece of tape and stick to PCB.  Solder in place
#8   a sample of a simple X (crossover) component (full size)

If you want, you can cover the crossover component with hot glue.
Use freeze mist to cool glue down immediately.
40  Using Arduino / General Electronics / Re: Put all your I/O in one place on: August 23, 2014, 01:44:16 am
Would be a bit before I could put this together in Eagle.
That's what To-Do lists are for.

"Sometimes things stare you right in the face." 
90' turn.    smiley-eek
See image:
41  Using Arduino / General Electronics / Re: [Beginner] How can I use the Arduino as a switch? on: August 23, 2014, 12:53:23 am
But when I use the Transistor [BC547] to control the ON/OFF switching, the onboard LED is always off

Always show use a drawing of what you are doing.

Did you have a Base resistor in the circuit?
42  Using Arduino / General Electronics / PCB jumpers on: August 22, 2014, 11:14:22 pm
I usually make SS PCBs.

Rather than use wire jumpers, I sometimes use zero ohm SMDs (1210 & 2010) to sneak over a trace.

Rather than going back to the schematic, adding the resistor then recreating the net list;
any suggestions how to add them to the layout to still pass the DRC test in PCB layout?
(perhaps two vias with oposite side trace is the only way)

I use WinQcad but the concept would be the same as other programs.

43  Using Arduino / Programming Questions / Re: Taking System Time and Date on: August 22, 2014, 09:09:32 pm
Start by looking at the time library.
44  Using Arduino / Microcontrollers / Re: Vertical 1284p on: August 22, 2014, 08:47:07 pm
Great minds really do think alike.

See reply #4:
45  Using Arduino / General Electronics / Re: Sketch freezes when I touch copper pour on: August 22, 2014, 08:24:51 pm
Grounding it, then touching it, absorbs your body charge.
Without grounding, your bodies charge spreads around the copper surface which acts like a capacitor and to the pins in the circuit where it plays havoc with the electronics.
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