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1861  Using Arduino / Programming Questions / Re: Power flicker arduino on: August 09, 2012, 11:03:10 pm
Rather than moving the "delay"... find out what, when the relay is activated is causing the display to flicker. Moving the "delay" is only going to change when the display flickers. The display is flickering because of a marginal power supply or an improperly wired relay (Missing the back-emf protection diode) or both. The display should never flicker unless you are actively writing to it and then only the written text should flicker, Never the whole display.

Doc
1862  Using Arduino / Displays / Re: Defective LCD 2004 on: August 09, 2012, 09:24:57 pm
Irrelevant comment about Carnak... Sorry

Doc
1863  Using Arduino / Displays / Re: Lumex LCR-U01602DSF/DWH 16×2 Backlit LCD Display Problems on: August 09, 2012, 09:23:06 pm
Contrast issues with VFD displays can be traced to 2 places and really the same place. 1 there is a "filament"...  much the same as a light bulb but it isn't supposed to light up much... It's the "Cathode" or most negative connection for the Anode or display elements (plates) first the filament should connect to ground (one end and it usually doesn't matter which end. The Anodes or plates usually need to be about 12 - 20V above ground at Microamp current levels to cause them to glow. Be Careful to supply the correct voltage to those pins and to ground one end. The filament is usually operated from 3 to 6 V at anywhere from 100 to 300 mA current. Supply the correct voltage and it will work well too much voltage will destroy the filament destroying the display. Low or intermittent brightness is almost always due to filament issues. Follow the data sheet recommendations carefully or brick the display.

Doc 
1864  Using Arduino / Displays / Re: SainSmart 3,2" TFT LCD Display, how to connect to an Arduino UNO? on: August 08, 2012, 11:58:11 pm
Thats funny because the sketch from UTFT for the 320 X 240 display compiled and worked Perfectly on my mega... I gueess because it either is the itead shield or a good copy? but mine looks great.

Doc
1865  Using Arduino / Displays / Re: Defective LCD 2004 on: August 08, 2012, 11:49:13 pm
and that one as I remember wasn't always spot on or off either... Funny Though I miss that stuff, but who'd watch it today?

Doc
1866  Using Arduino / Displays / Re: I2C OLED Panel and Library(128x64) for Arduino on: August 08, 2012, 11:45:01 pm
Whats really interesting beyond the amazing amount of support is the price... I was curious and looked.  That display isn't bad at all for less than 17.00  $16.99 to be exact you can own your own copy, Personally I think it would make a great little clock display especially for a mini and a gps receiver... and a clock chip, turn on the gps every couple or hour or so to keep the clock chip reasonably honest and set alarms as required, even play a tune... all in a sketch, music too.

Doc
1867  Using Arduino / Displays / Re: Lumex LCR-U01602DSF/DWH 16×2 Backlit LCD Display Problems on: August 08, 2012, 11:25:51 pm
Did I miss something here I could swear that the adafruit code says , "LiquidCrystal lcd(2, 4, 9, 10, 11, 12);" and your says "LiquidCrystal lcd(2, 4, 8, 9, 10, 11);.
Could this perhaps been overlooked?

Doc
1868  Using Arduino / General Electronics / Re: Ground color on: August 08, 2012, 10:37:02 pm
Shorten up the time delays and test it and when you have that part working start putting the right times back and test until it all works...

Doc

1869  Using Arduino / General Electronics / Re: what is that? on: August 08, 2012, 10:33:10 pm
You don't need a great deal of power to do that especially at a few inches of vacuum, something that most any refrigerator coolant pump can do. Mine did, I used 25KV Neon sign transformers and balloons to carry the Gas home that I used to get from the neon sign company. When I fired up my "Coil" all the neighbors visited my house... Had eventually to make a hiding place under the house. I made a rotary spark gap transmitter once... Never built a receiver though, this was when I was 14 and 15 years old... I left home at 16 and lost interest as I had to work for a living then... I did have a lot of fun, I wanted to make a Cottrell precipitation filter for a science fair project but I could never get project approval and I was only generating about 50 KV for the precipitator. A Cottrell Precipitator is an electrostatic filtering device used commonly as a smokestack filter for Really heavy industry like coal fired power plants and steel mills... There was A home device sold about 10 maybe 20 years ago called The Ionic Breeze. I still have a small one that works quite well in my bathroom, nice little breeze too. Enough at any rate to blow out a bic cigarette lighter.

Doc
1870  Using Arduino / General Electronics / Re: low side current sense help on: August 08, 2012, 10:16:40 pm
Naah it's just a kilowatt of power... Make a great Hot dog Exploder. AS to the sense resistor and High voltage the device sensing the over current condition should disable the HV supply with a latching relay...
REALLY 500V @ 2A -  1 KW of power handled by an H-Bridge??? and current sensed and all you are concerned about is that??? You had better sit yourself down and generate an accurate plan, schematic and
and proposed software first... there is the Generating that much voltage at that kind of current is going to make someone a very happy man selling you a transformer. (Try Hammond). At the voltage level
you are talking about it takes less that 100mA to be fatal... %00V and an H-Bridge... What kind of motor are you planning on driving. Did you ever see one of those generators that is supposed to make
earthworms come out of the ground? What you are discussing could KILL a 10 Acre farm of them... in about 5 seconds.  500V @ 2A or 1KW...? to a current sensed H Bridge. Better to use a different motor
and make a VFD (Variable Frequency Drive) for a 2KW AC motor, Vary the frequency and vary the speed. What were you going to do about the back emf this device is going to sense as well... If it's Even for a
motor. The prime issue is that in order for you to "reverse" this thing (What an H bridge does best) you have to do something with the energy present in the :System" you havve a Mass of so many units and in
motion it has stored kinetic energy... you have to deal with that before you can "Throw her into reverse" as to the sensing that can easily be part of an off the shelf Power supply and the H Bridge as well. It is
 well beyond the expertise you have demonstrated in this Forum so far... For building the power supply there are several books I could recommend and The H Bridge is an off the shelf item. All of it is but you
are looking at about $900 to $1500.00 for the power supply... as surplus. It might be available as a 3 phase 440V device still I should think that a regulated (you didn't suggest otherwise) and that is usually
what sensing current is about, Would sell in the high $2000's possibly more and the H bridge is going to be a real surprise for you as well If all you want to do is change polarity 4 relays would do it and provide
dynamic braking Too and some kind of motion lockout would be trivial to do... U sure 500V @ 2A? 1KW and not 50V @ 2A??
1871  Using Arduino / General Electronics / Re: How reliable are Arduinos?? on: August 08, 2012, 08:50:18 pm
No I think he needs a tidal generator for power and forget the plastic's he needs to find a salt cave at least a mile below sea level to prevent damage from cosmic rays possibly a focused mirror and a bunch of Seebeck  junctions at the point of focus might make enough power to keep the array aligned and have enough excess for a main battery and a backup battery as well...

Doc

1872  Using Arduino / General Electronics / Re: what is that? on: August 08, 2012, 08:43:05 pm
It looks like a low energy plasma discharge in a predominately nitrogen gas mix under low pressure... Or that's what the one I made when I was in my early teens with the output of a 2 foot tall tesla coil.

Doc
1873  Using Arduino / General Electronics / Re: Question about TL431ACLPG shunt regulator diode on: August 08, 2012, 08:38:25 pm
I as away for most of today and although the offer might have been valid when I made it it was based on some basic assumptions and you fail to meet them... So after reading your last two posts you seem to have the theoretical side well under control and obviously you don't need the services an an aging senior engineer with 15 years experience in just what you are now doing so I will BUTT OUT Permanently From this thread... Sorry I intruded

Doc
1874  Using Arduino / General Electronics / Re: interfacing 10 turn precision potentiometers to analog In on: August 07, 2012, 08:32:45 pm
That measured "Jump" at the end is the beginning of the eleventh turn old school knobs for them were Vernier counters and stops at exactly ten turns so the pot never goes there, It''s gear limited to that number of turns. real Old school now with digital pots... Much more predictable. easier to change quickly. They can be used for linear distance measurement but the gearing must never be allowed to exceed Ten Turns. Work Well too.

Doc
1875  Using Arduino / General Electronics / Re: Question about TL431ACLPG shunt regulator diode on: August 07, 2012, 08:18:46 pm
It is a simple circuit that can be controlled for zero current drain and using a little trick with a PNP transistor sense when the battery voltage is above a certain point and I thought I could see a way to do it simply but some what inexpensively with about 5 parts with the same accuracy as the A/D... The point about the regulator was more rhetorical than anything else because I thought You had overlooked the 5V reg quiescent current and how much it can ramp up at higher input voltages and be overlooked as one of those "Page Three" things, I've been bit by that one a time or two in the past and I learned to read all the data sheets of the design proposed devices first before I began assembling them  as an entity or better before I created the first approximation of a design as a schematic proposal for consideration as required. That's All.

Doc

Doc
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