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106  Using Arduino / Displays / Re: Help Me - 3,5 TFT Touch LCD Screen Display - I can not make it work, help. on: July 25, 2014, 04:50:49 pm
So did i (click !)
107  Using Arduino / Displays / Re: Help Me - 3,5 TFT Touch LCD Screen Display - I can not make it work, help. on: July 25, 2014, 03:53:59 pm
Those aren't controllers, they are level shifters.
the display functions at 3 volts, Arduino at 5 volts.
Connecting them without level shifters would destroy at least one of them.

What you just called card, is a shield.
Assume a shield is an interface between different devices, which in  this case is very much true.
There are 2 devices on that shield; a display with ili9327 controller (possibly built in the glass part), and a SD card reader.
108  Using Arduino / LEDs and Multiplexing / Re: using 4021 parallel shift register with internal pullup resistor on: July 25, 2014, 03:32:03 pm
No.

That's what an analog switch (relay) would do,
The MPX isn't bi-directional, and therefore doesn't do what you imagined.
109  Using Arduino / LEDs and Multiplexing / Re: using 4021 parallel shift register with internal pullup resistor on: July 25, 2014, 01:35:26 pm
Do you understand the function of a pull up or down resistor has ?
If so you should be able to figure out the answer.
Remember that this MPX isn't an array of relays you are switching.
110  Using Arduino / Displays / Re: basic to use arduino uno to ulcd 4D systems on: July 25, 2014, 09:02:20 am
Hi and welcome.

You have mentioned some brand of the display, but not the actual display.
That leaves any potential respondent guessing what display your are playing with.
As we are into Arduino and they have 1 product that has an Arduino shield, my best guess is that this is what you are asking about.
That product has a library, including at least 1 example, that can be downloaded from GitHub (click !).
Downloading from GitHub is a pain because you can't simply point and select download file, but you can get them from there.
Read the information form GitHub.
It tells you to install the library and points to an Arduino instruction how to do that.
After having done so, study the example offered over there.
It is quite large and might be overwhelming, but it claims to offer "pretty much every 4D command".

4D Systems tells you to go to this Arduino forum in case you have any questions, but it is their responsibility to support their product, not that of the community.
For the 95 dollars that product is sold for, they should offer a very decent support instead of sending you over here.

Because of that, i would choose an other product, that can be had for a fraction of this price.

111  Using Arduino / General Electronics / Re: Transistor Naming Nomenclature : Meaning of the "C27" in the "BC547B" Transistor on: July 25, 2014, 06:56:30 am
Hi and welcome.

This usually is an indication of production plant and date.
See datasheet in above post.

It has very little to do with technical specifications.
Usually there is some logo indicating the brand, can't see it here.
112  Using Arduino / General Electronics / Re: What's this peice called? on: July 25, 2014, 06:16:31 am
That problem could be reduced by stacking all 50 of them smiley-wink
113  Using Arduino / Microcontrollers / Re: Smallerst arduino on: July 24, 2014, 02:56:25 pm
Click on the link beneath his post (any of them).
Scroll down about 80 %, and you'll find that board.
Didn't see any order info there so you might want to contact him by email.
114  Using Arduino / Motors, Mechanics, and Power / Re: L293D no power on output on: July 24, 2014, 02:47:09 pm
Give some more information.
What motor are you (trying to be) using ?
Do you know that these 9 volt batteries really suck for powering a motor ?
Do you know the L293D can control no more that 600 mA, and that it drops (eats) about 3 volts ?
115  Using Arduino / Motors, Mechanics, and Power / Re: Serial monitor crash when relays switch on main power on: July 24, 2014, 02:37:43 pm
That lamp seems to be a PL lamp.
Those were the first power saving lamps that could be put in a normal E27 lamp fitting (that i know of).
If so, then it is highly inductive, as it is nothing else than a small TL that was bent multiple times to fit the jar it is mounted in.
They evolved from standard (bi-metal) starter to electronic starter to a complete electronic module.
The first two were very inductive due to the nature of a starter.
The last one was less so.
This was over 25 years ago, though.
116  Using Arduino / Microcontrollers / Re: Smallerst arduino on: July 24, 2014, 11:42:55 am
I recently found this.
It's an ATmega32U4, so should be Leonardo compatible.
It doesn't offer that much pins (3 analog, 3 digital) due to its size, but serial, I2C and ICSP (requires some more soldering skills) are available.
Because of it being an ATmega32U4, USB is available also through a micro connector.

I think i'll have some applications in mind for this one, so have ordered a couple.
117  Using Arduino / Displays / Re: 16x2 goes blank after few hours. on: July 24, 2014, 06:16:52 am
Paul: your link results in a 404 message (page not found)  to me.

Google helped with that though.
It is an AC optocoupler, which should also need 2 wires, doesn't it ?
118  Using Arduino / Programming Questions / Re: How to split an incoming serial into int on: July 24, 2014, 06:05:47 am
That is exactly what i meant.
I got that you were receiving these value once every second, and expected a pause between them.
You need to find specific `recognition points´, and a pause is one of them.
A pause can be measured / found using a timer.
I hinted to a possibility, because it is a school project, and you didn't exactly tell about the pause.

School project means you need to do some thinking yourself, and you will not be helped by simply serving you some code.
You'll really learn when you do stuff yourself including the unavoidable errors and mistakes you'll make.
119  Using Arduino / Programming Questions / Re: How to split an incoming serial into int on: July 23, 2014, 04:31:49 pm
...And that's where those comma's come in.
Count the comma's.
But you'll need to find a way to synchronise first.
I bet you can do that using timing.
120  Using Arduino / Microcontrollers / Re: Arduino Uno ---> Arduino Pro on: July 23, 2014, 03:32:56 pm
Is that pro, or pro mini ?

Pro mini comes in the same variants, but is really small and so will gain the most in space.
Believe it or not, it has 2 more analog pins (A6, A7), as the chip has them available in its SMD package.
I can't tell why the pro (which has the same chip) doesn't have that
I can only guess that that to benefit the form factor that makes it possible to use the same shields, but even then that should not be any problem.
The pro mini is so small, that is hasn't got the USB to serial adapter on board.
You need to use an external adapter board for that, but you only need one for all pro mini's you'll use in the future (that do not need an USB connection).

If you want 100 % compatibility, get the 5 volt version.
That one has the same clock at 16 MHz, the 3 volt version is limited (due to the 3 volts) to 8 MHz.
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