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301  Using Arduino / General Electronics / Re: Help in Understanding Relay on: August 13, 2014, 01:05:56 pm
Quote
but, it is considered very bad practice.
failure of one relays will case instant and possible catastrophic failure of the second.

In 45+ years i have never seen a contact failure.
I have seen the internal wire that goes to the contact open.

302  Using Arduino / General Electronics / Re: Help in Understanding Relay on: August 13, 2014, 12:24:15 pm
Place SWC on the contacts to suppress the arcing.
Large or small contact surface they only touch in a very small area.
Paralleling the contacts does increase the current capability to handel the load.
303  Using Arduino / Programming Questions / Re: Writing and calling functions on: August 13, 2014, 11:54:12 am
Coming soon.
304  Using Arduino / General Electronics / Re: Dumb Novice Questions re Enclosures on: August 12, 2014, 10:52:51 pm
See:
http://forum.arduino.cc/index.php?topic=238174.0

Use a hole punch if the front panel is flat and the holes are relatively close to the edges
http://www.amazon.com/Neiko-Power-Punch-Sheet-Metal/dp/B0002T87CW

Also us a nibbler
http://www.amazon.com/Klein-Tools-76011B-Nibbler-Tool/dp/B0000CBJCT/ref=pd_sim_hi_1?ie=UTF8&refRID=1B0KPVT5F6ZC1WABXPBP
305  Using Arduino / Displays / Re: New "Bubble" display! on: August 12, 2014, 09:59:41 pm
Let us not forget the ribbon cable mount:
306  Using Arduino / Displays / Re: New "Bubble" display! on: August 12, 2014, 09:22:03 pm
I think others have discovered these bubble displays and know they are a one time offer.
They are getting them before they are all gone.

The bubble-Licious board makes them almost plug and play.
307  Using Arduino / Displays / Re: New "Bubble" display! on: August 12, 2014, 08:56:48 pm
Just got my Bubble-Licious cards.
They look and work great.
Can't wait to get them in some projects.
Sparkfun bubble displays down to 1,727 that is -100 per day.

I finalized the vertical mounting by using two 12 pin right angled female headers ($1.00) and one 24 pin wire wrap socket ($1.00).

EDIT:
I used a piece of old 1/16" PCB material to raise both female headers off the Bubble-Licious surfaces to get the 0.3" spacing needed for the wire wrap socket.
 
Thanks Crossroads.


308  Using Arduino / General Electronics / Re: Mounting LCD on: August 12, 2014, 02:04:16 pm
4 ways to avoid screws thought the panel front, see image below:
309  Using Arduino / General Electronics / Re: Help in Understanding Relay on: August 11, 2014, 11:18:26 pm
3A/5A. 28VDC 220VAC
If they are rated at 3a at 28vdc you can drive DC watts of  84
If  they are rated at 5a at 220vac you can drive AC watts of 1100

Can put contacts in parallel.
310  Using Arduino / Project Guidance / Re: Word lookup table on: August 11, 2014, 10:38:45 pm
May show us some code that you are currently using for this.
311  Using Arduino / Microcontrollers / Re: Voltage Regulators Being Used on: August 11, 2014, 10:36:22 pm
I don't have one but the schematic does show a 3.3 reg.
312  Using Arduino / General Electronics / Re: Help in Understanding Relay on: August 11, 2014, 10:31:24 pm
Show us a link to the relay data sheet.
My first thought would be this has a 12 volt coil with contacts rated at 5 amps each.
You could put the contacts in parallel.
But we need to see the data sheet to see what voltage the manufacturer gives to the contacts rated at 5 amps,
This could be 12 volts at 5 amps or 120VAC at 5amps etc.
313  Using Arduino / General Electronics / Re: Confussing Loading Computation on: August 11, 2014, 10:25:10 pm
To get the exact wattage you need to measure the exact current and voltage involved.
314  Using Arduino / Programming Questions / Re: Void loop() makes confuse me.. on: August 11, 2014, 09:26:40 pm
Quote
compiler doesnot goto second function
How do you know?
315  Using Arduino / Project Guidance / Re: Word lookup table on: August 11, 2014, 09:24:59 pm
Sure
Or
get a Atmega1284 with lots of memory. (Bobuino2)
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