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1  Products / Arduino GSM Shield / Re: ITEAD SIM900-GPRS-GSM-Modul doesn't work on: July 29, 2014, 04:06:29 pm
For gods sake, resize those pictures!

Never post images larger than 1024x768, thanks.

// Per.
2  Using Arduino / LEDs and Multiplexing / Re: Doubt about the LCD Keypas Shield on: July 28, 2014, 06:15:06 pm
OK, i put this into Google "DFRobot LCD shield" and got this:

http://www.dfrobot.com/index.php?route=product/product&product_id=51

If you read the documentation there, from the manufacturer, it says:


Quote
This is a very popular LCD Keypad shield for Arduino or Freeduino board. It includes a 2x16 LCD display and 6 momentary push buttons. Pins 4, 5, 6, 7, 8, 9 and 10 are used to interface with the LCD. Analog Pin 0 is used to read the pushbuttons. The LCD shield supports contrast adjustment and backlit on/off functions. It also expands analog pins for easy analog sensor reading and display.

// Per.
3  Using Arduino / LEDs and Multiplexing / Re: Doubt about the LCD Keypas Shield on: July 28, 2014, 06:07:24 pm
No, it does not use all pins.

Why not start by posting a link to the shield you are using, then I can advice, which pins are not in use.

// Per.
4  Using Arduino / LEDs and Multiplexing / Re: Doubt about the LCD Keypas Shield on: July 28, 2014, 05:41:01 pm
Yes, you can connnect an ultrasound sensor, just use some pins that are not used by the LCD-shield.

// Per.
5  Using Arduino / Displays / Re: Lcd 16x2 with glitch on text on: July 25, 2014, 06:19:32 pm
While i agree that not all LCD displays have decoupling caps, i could quicky find some that did.

Looking at the internals of the HD44780 i cannot see why a missing or insufficent decoupling of the controller could make a single line dim/missing, while the operation of the display pertains.

// Per.
6  Using Arduino / Displays / Re: Help Me - 3,5 TFT Touch LCD Screen Display - I can not make it work, help. on: July 25, 2014, 03:52:59 pm
The 74HC245 is not a controller - it is a level converter, converting the 5 Volt signals from Arduino to 3.3 Volt which the display can handle.

Have you tried the link i posted ?

// Per.
7  Using Arduino / Displays / Re: Lcd 16x2 with glitch on text on: July 25, 2014, 03:47:17 pm
That problem has absolutely nothing to do with your wiring. The caracters are generated internally in the display, so wiring cannot make a line defective.

Defect zebra-strip, 100% sure.

I have never seen a LCD display that didn't have the proper decoupling caps built-in, so my bet is that the zebra-strip is faulty.

// Per.
8  Using Arduino / Displays / Re: Help Me - 3,5 TFT Touch LCD Screen Display - I can not make it work, help. on: July 25, 2014, 03:42:21 pm
The 74HC245 is not the controller.

http://www.nxp.com/documents/data_sheet/74HC_HCT245.pdf

It says on the first line in the code which controller it is for, read the line:
Code:
//   ic:ili9327

So, try here:
http://bit.ly/1t5nfZI

// Per.
9  Using Arduino / Installation & Troubleshooting / Re: Interesting FTDI issue on: July 23, 2014, 09:37:10 pm
Board 0 works on all Windows and Macs.   Boards 1-3 only work on Macs.  On the Windows machines they don't work.  I am stumped.

I'd say fake FTDI-chips!

http://zeptobars.ru/en/read/FTDI-FT232RL-real-vs-fake-supereal

// Per.
10  Using Arduino / Project Guidance / Re: Component that receives signals from a remote? on: July 23, 2014, 07:33:58 pm
The Canon remote uses standard 36-38 KHz modulation like standard TV-remotes.

// Per.
11  Using Arduino / Project Guidance / Re: Component that receives signals from a remote? on: July 23, 2014, 07:11:27 pm
You just need an IR-receiver. These are 3-pin components.

http://i.stack.imgur.com/rojKP.jpg

You will find one in a scrapped home appliance with remote control - e.g. an old TV, VCR, DVD-player, home stereo, you name it.

// Per.
12  Using Arduino / Displays / Re: 16X2 LCD - Flip - Change orientation on: July 23, 2014, 07:09:27 pm
Solder a short piece of ribbon cable to the display, flip it over and solder the other end to the pcb.

// Per.
13  Using Arduino / Installation & Troubleshooting / Re: Interesting FTDI issue on: July 21, 2014, 11:25:44 pm
Maybe you need to prune the Serial-port number thingamajig?

http://superuser.com/questions/408976/how-do-i-clean-up-com-ports-in-use

// Per.
14  Using Arduino / General Electronics / Re: ebay relay boards on: July 20, 2014, 08:16:24 pm
I would advice against that exactly board that is linked to. Look at the underside. There is under 2mm spacing between the high voltage and low voltage tracks. It doesn't take much dirt or moisture to break that path, and then your Arduino goes "live" and can kill you if you touch it.

Unfortunately, a lot of these "Arduino-compatible" products on eBay are made by people that have absolutely no understanding of good measures and safe practices. I hope no one is harmed by these badly made boards.

Another example of a board that is very dangerous is this: http://www.ebay.com/itm/261536188402 - The copper pour all over the board offers no isolation from the high voltage to low voltage side... crazy!

A much better approach is seen here - Here the designer actually knows about isolation, and had a piece of the PCB milled out, to isolate better: http://www.ebay.com/itm/161371495044

// Per.
15  Using Arduino / General Electronics / Re: Do i need capacitors on: July 19, 2014, 11:26:49 am
Regarding capacitors on motors for noise-dampening, all you need to know is here:
http://www.beam-wiki.org/wiki/Reducing_Motor_Noise

// Per.
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