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31  Products / Arduino Due / (Solved) a newly downloaded Arduino 1.5.5 BETA for DUE does not start on: January 31, 2014, 02:01:21 pm
I have twice tried to download and install the Arduino environment for DUE from here. I selected the "Arduino 1.5.5 BETA (with support for Arduino Yún and Arduino Due boards)"

Installation is normal but when I try to start it, I get an error message which says:
An error occurred while starting the application.

I have a Win 7 system and the DUE IDE has worked before in this machine. It has been long since uninstalled.

Edit: I have now tried both zip and install version and they both  have the same problem. With Zip version I also get a note from Windows Firewall but not from installed version.
32  Products / Arduino GSM Shield / Re: Need Help in configuring the 3G/GPRS shield from ITEAD STUDIO on: January 30, 2014, 03:04:21 pm
There is a sample program on Itead's webpage. Have you tried those?
33  Products / Arduino GSM Shield / Re: Sim900 GPRS SHIELD problem help me all? on: December 17, 2013, 04:40:56 pm
You're welcome!
34  Products / Arduino GSM Shield / Re: Code hangs in interrupt when there is poor GSM signal on: December 16, 2013, 08:38:55 am
Perhaps this is a similar problem I had with an other GSM Shield. The shield stopped working after day or two. There was no error messages and no way to tell that it had stopped working. Only way to recover was to shut down the power for a second.
35  Products / Arduino GSM Shield / Re: gsm shield on: December 16, 2013, 08:31:03 am
A wrong number? Does it work the other way around. That is, can you send into your GSM shield?
36  Products / Arduino GSM Shield / Re: Sim900 GPRS SHIELD problem help me all? on: December 16, 2013, 08:28:34 am
Hi. Sometimes weird characters are caused by different baud rates.
37  Topics / Device Hacking / Re: This is what we're missing from the Arduino range! on: November 06, 2013, 04:23:38 pm
Well, beer tastes like ..... But to open a Coca cola bottle you sometimes need a little ingenuity or imagination. When I was young and desperate I found out that a drawers handle was just the tool made for this.

Leif
38  Using Arduino / LEDs and Multiplexing / Re: 10 Watt high power LEDs. on: November 05, 2013, 11:19:19 pm
I found a schematic diagram of a transistor driving LED.
http://www.sqlskills.com/blogs/paulselec/post/arduino-figuring-out-transistors-and-associated-resistors.aspx
Here R1, the collector resistor, limits the LED current. With high current R2, the base resistor, should be smaller and the transistor bigger. Or use a fet.
39  Using Arduino / LEDs and Multiplexing / Re: 10 Watt high power LEDs. on: November 05, 2013, 06:04:03 pm
May I join too.

If Leds are on the collector and resistors are on the base, there is nothing to limit current to 400mA. Current is Base current * current gain. You need a resistor in series with the Leds.
Quote
and not use any current limiting (Except on base),

There's nothing to limit the current?

The resistor on the base does! (Ugh)

Perhaps. If you would show a schematic diagram of your circuit here. If not, that is all right too.
40  Using Arduino / LEDs and Multiplexing / Re: 10 Watt high power LEDs. on: November 05, 2013, 04:07:09 pm
May I join too.

If Leds are on the collector and resistors are on the base, there is nothing to limit current to 400mA. Current is Base current * current gain. You need a resistor in series with the Leds.
Quote
and not use any current limiting (Except on base),
41  Using Arduino / Project Guidance / Re: Standalone arduino power generator on: November 05, 2013, 03:54:19 pm
Can you connect your sensors so that they connect power with a relay to your alarm system. Your relay needs extra pair of contacts. The extra pair keeps the relay coil powered. A kind of latching or holding system. Then when processor has done its job, it turns the power off.

42  Using Arduino / Networking, Protocols, and Devices / Re: FM modulation device on: November 05, 2013, 02:43:46 pm
I think there are some approved/legal modules for long distance data transfer. They work around 2,4GHz I think. But 1.5km is a long distance.

By the way, this is an Arduino forum. This has had very little to do with Arduinos so far. You could check other Arduino forums too, like Project Guidance and so on. And try Googling with some magic words like "long distance radio module" or something similar.

Edit: And how about starting a new thread with subject "long distance communication? Your current subject has nothing to do with what you actually wish to do.
43  Using Arduino / Networking, Protocols, and Devices / Re: FM modulation device on: November 04, 2013, 02:35:01 pm
Last time I checked, it was illegal to transmit voice on ISM band. Radio amateurs have a permission to do it on their bands or frequencies. You should check your local authorities what is possible and what not. Or became a radio amateur, a Ham.
44  Using Arduino / Networking, Protocols, and Devices / Re: Radio communication on: November 04, 2013, 11:23:29 am
Try Googling modulation, demodulation, also some studies about RF electronics would help.
45  Using Arduino / Networking, Protocols, and Devices / Re: FM modulation device on: November 04, 2013, 11:20:57 am
I am not sure what it is you want to do. 434MHz is part of the ISM band (and HAM band too). ISM transceivers let you choose either 433-434MHz band or 968 band. And maybe some other bands too.
But what about the FM modulator? This large change of frequency is not usually called modulation. With ISM transceivers you don't have care about modulation, and you really should not, because you may cause interference to others.

This is best I can do without a crystal ball and some magic.
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