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1  Using Arduino / Displays / Re: 2.8" TFT LCD, unknown ID. on: Today at 06:03:31 pm
That Amazon site has a link (in Q&A) which contains some Arduino folders.
Tried that yet ?
2  International / Nederlands / Re: Hulp gezocht bij inlezen txt file on: Today at 05:40:51 pm
Dank je wel Nico.
Daarmee kan ik vermoedelijk de sketch die ik eerder gebouwd heb efficiƫnter maken.
Want daar heb ik met de mij bekende middelen bepaalde data die binnenkomt via een seriƫle verbinding on the fly uit elkaar getrokken en tegelijk de hexadecimale waarden daarin omgezet naar decimale waarden.
Dat was overigens ook weer erg leerzaam en daarom zeker niet voor niets.
Maar met deze twee methodes die je net hebt geopperd zal de code er een stuk compacter op worden en vermoedelijk ook sneller werken.
Dus ik ga daar ook maar eens mee aan de gang binnenkort.
3  Using Arduino / General Electronics / Re: Ohm's Law. on: Today at 05:21:41 pm
To make things interesting, what if this sketch is also using a bunch of LEDs to show some status.
So the "5 volts"is actually more like 4.6 volts..
Where's the reference then ?
4  Using Arduino / General Electronics / Re: Using Arduino to turn power supply on and off on: Today at 10:05:07 am
How often do you need to sample your sensor ?
And how much time does it take for a sensor to become available after power up ?
Do your sensors need some minimum temperature in order to function optimal ?

How about switching each sensor on for just one sample, and then off again ?
Relays consume power and will also heat up, is that acceptable ?
5  Using Arduino / General Electronics / Re: Ohm's Law. on: Today at 09:35:44 am
If some fixed and known resistor is 100 Ohms, the power supply is a stable 5 volts and a measured value at the joint of the two resistors is 2.5 volts, then the unknown resistor is 100 Ohms indeed.

What voltage will you see when the unknown resistor happens to be 47K Ohms ?
6  General Category / General Discussion / Re: ARDUINO SHIELD STACKING on: Today at 09:26:02 am
You are asking as if these two are contradicting.
I don't see that, they are confirming each other i'd say.

By the way a Shield Select as i guessed doesn't exist.
SS is specific to SPI and means Slave Select.

If you have this USB host shield in use, pins D7 to D13 are in use and cannot be used for other non SPI shields.
Pins D7, D8 and D9 are exclusive to this shield and pins D10 to D13 are shared amongst all SPI devices.

If you have other SPI devices, you'll have to let those know the data on that bus is meant for them by using other pins than D7, D8 or D9.
The compability list lets you find out any conflicts and may help you decide on how to handle that.
You could have conflicts that can't be resolved, but sometimes you could do some relatively small modifications, rerouting that shield's pins.
It typically requires cutting a wire or two and replacing it with a piece of wire.
And you have to alter the sketch or a library.

Or find an other shield that doesn't conflict of course.
7  General Category / General Discussion / Re: ARDUINO SHIELD STACKING on: Today at 08:18:33 am
I understand that shields can't use the same data pins, if someone could define "data pins" that would be great.
By saying you understand here, you mean you read that but really don't understand, right ?

It's not that difficult.
If you are using a pin for some function on a shield, you can't use that pin for another function on another shield, unless you lock that shield.
Locking a shield might be done by using a CS, Chip Select, signal or a SS for Shield Select i guess.

Quote
I know about SPI communication and how it works and I know that shields can share the SPI pins except for SS or CS, but for example why does the ethernet use pins D10, D11,D12 and D13? are those not the SPI pins that can be shared?
Maybe because that shield has 2 devices on board that both use SPI ?
These are the network chip and the SD card (if used).
So you can't use D10 to D13 to light a LED, or control any other signal that is not SPI.

Quote
Please Please Please help ME! I need very specific information here! you are talking to a complete noob at Arduino! Feel free to link me stuff that will help me understand better but do not link me to a general tutorial like the Sparkfun or the freetronics because their is a 95% chance that iv'e read those tutorials!

Snap out of it.
You already understood what this is about, but are making things complicated because you think there is some other reason for this.
It's not that complicated, as a matter of fact this is all very logical.
8  Using Arduino / General Electronics / Re: Mega to RS485 UART - Enable Pin Set High However Randomly Goes and Stays Low on: August 29, 2014, 05:23:22 pm
How long does it take for that output to stay LOW ?
How many packets do you get, and is that always the same number ?
9  Using Arduino / General Electronics / Re: Switch, Relay and Backup line. on: August 29, 2014, 04:59:47 pm
Hi and welcome.

Hey guess what, i just caught one of these questions !

There's "just normal switches" and "just normal switches".
And then some.

There's no doubt that that switch has a brand and type somewhere on it.
Communicate that.
10  Using Arduino / General Electronics / Re: Mega to RS485 UART - Enable Pin Set High However Randomly Goes and Stays Low on: August 29, 2014, 03:22:34 pm
I'm not sure, but maybe you should check the number of received packets to the number of packets to send.

Does this really do what you think it does ?
Code:
 for (int j=0; j < 5; j++)
  {
    Serial1.write(receivePacket[j]);
    Serial.print(receivePacket[j]);
    Serial.println(" ");
  }
11  Using Arduino / General Electronics / Re: Motorized rotary switch on: August 29, 2014, 01:51:10 pm
I have never heard of speaker wires being called "HP lines". Google has no relevant matches in the first three pages.

OP pierromond has a name that sounds quite French.
Therefore HP must relate to Haut Parleur, which translates to loudspeaker, and is probably a very common short for this to the French.
12  Community / Bar Sport / Re: How many times is someone not replying after asking question ? on: August 29, 2014, 01:36:10 pm
As these newbies don't read manuals, the only way to do that, would be to have that option set by default.
The option is already there, in any post you're making (perhaps not in quick replies).
Find it by clicking the text "additional Options..." below the edit field.
First item there is "Notify me of replies".

Am i mistaking or is that option already set by default when registering ?
13  International / Nederlands / Re: Geschikt OLED scherm voor Arduino? on: August 29, 2014, 11:40:17 am
(Bijna) helemaal eens met Nico.
Die advertentie is inderdaad wel een OLED.
Heb er zelf ook al hele verhalen over geschreven, want heb zelf 2 van die schermpjes liggen.
Is echt wel heel leuk als je het aan het werken krijgt, en dat zeg ik zo omdat dat dus niet vanzelfsprekend is.
Maar die schermpjes zijn dus van het formaat postzegel en de pixels zijn erg klein.
Daar kun je er dus wel leuke dingen mee doen maar als je een leesbare text wil afbeelden moet je een groot font gaan gebruiken (en das dan weer zonde van die best wel mooie resolutie).

Ik zal straks nog ff de link naar mijn verhaaltjes (als onderdeel van een vrij grote thread alhier) in deze post editen.

Ik ga niet zo ver als Nico dat ik het ding afraad, want het blijft nog steeds leuk speelgoed.
Maar als je had gehoopt hier iets zeer bruikbaars mee te gaan maken, is het wel raadzaam als je eerst eens kijkt hoe groot ze eigenlijk (niet) zijn.

[edit]
Zoals beloofd, een link naar wat experimenten van anderen en mijzelf om zulke displays onder controle te krijgen.
De displays zelf zijn daarbij het probleem niet, de ontwerpen van de boardjes waarop ze gemonteerd zijn wel.
Die thread is en het Engels overigens.
[/edit]
14  Using Arduino / Displays / Re: Problem with SSD1306 LCD and U8glib on: August 28, 2014, 04:17:20 pm
Hi and welcome.

If you're going to ask questions, do it the correct way.
There are at least 5 different displays mentioned in this thread, which one do you have too ?
If it's the last mentioned one, that doesn't seem to have 6 pins.
Are you referring to some pin numbers at the Raspberry  board ?
It seems like you are, but don't have us guessing about what you might be telling us.
15  Using Arduino / General Electronics / Re: Reading A Component's Data Sheet? on: August 28, 2014, 04:05:12 pm
Hi.

Some (if not all) of the questions will be answered by asking Google.
Your question about dither will be taken care of by wikipedia, thanks Google.

MSB and LSB are short for Most Significant Bit and Least Significant Bit, that should be self explanatory.

Understanding a datasheet can be a pain.
A lot of it needs to be read in context, and you seemingly picked a few phrases or words and ripped them out of that context.
So how about pointing to the device you're talking about, and/or its datasheet?
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