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181  Using Arduino / Installation & Troubleshooting / Re: Menues garbled when opening IDE on: July 16, 2012, 09:38:17 am
I can't help you  but I have the same issue in version 1.0 on Ubuntu so you're not alone.
182  Using Arduino / Installation & Troubleshooting / Re: Missing digital signature for driver on Windows 8 on: July 15, 2012, 04:36:47 am
Thanks Louis for sharing the signed inf and certificate.

Has there been any word on the official approach to this problem?
Disabling driver signing, creating your own signing certificates and manually installing root certificates can hardly be in line with Arduino's image of being an "easy to get started with" platform.
Windows 8 is just around the corner now.

183  Topics / Science and Measurement / Re: Multiple wireless temp. sensors displaying status on tablet PC on: July 13, 2012, 03:04:28 am
They are a little bit more expensive than homebrew modules but is probably not a bad choice.
Never tried them.

If you want to run your sensors from batteries you may want to skip the voltage regulator and run directly from battery to decrease the power consumption.
184  Topics / Science and Measurement / Re: Multiple wireless temp. sensors displaying status on tablet PC on: July 12, 2012, 04:44:23 pm
Building a wireless sensor network won't be very cheap but it can be loads of fun.
This is one approach to an Arduino based wireless network:

For a wireless sensor you probably want a temp sensor like the DS18B20.
You need a microcontroller (Arduino) that can read the values from the sensor and you need a wireless transmitter to send the sensor readings to your "hub".
The cheapest wireless transmitters and receivers around seems to be the OOK 433 units on the page you linked. They are apparently out of stock where you were looking but they are available from other sources at lower prices.
I've bought them from eBay and yesterday someone here recommended ElectroDragon (
You might need an Arduino and a transmitter for each sensor. If some sensors are closer together they could share the same Arduino/transmitter.
You will only need one receiver for the hub that will collect the data from your sensors.

This will soon add up to a lot of Arduinos that are both too bulky and too expensive as temp sensors so you will probably need to build your own custom boards using ATmegas or ATtiny's. I don't know which of the Tinies that can handle the libraries for the wireless modules. Haven't used ATtiny myself.

There are several options for displaying the temperatures on the tablet. I don't know of a ready-made solution that doesn't require programming. Which options you have depends on what kind of tablet you have but you probably don't want to have the receiving Arduino connected directly to your tablet all the time. Do you?
If that's what you want that could be done by using processing for example but that requires Windows/Mac/Linux rather than iPad or Android.

If you add an Ethernet shield you can post the data to some web page that the tablet can read or you can even run a web server on the receiving Arduino.
A simple network based client/server application might work too.

If the tablet has Bluetooth that could be an option for communication between tablet and Arduino.

Use your imagination.

If you have no idea at all how to do any of it you have a big mountain to climb.

I'm currently playing with a PHP-based web solution for logging temperatures from my sensors to a database and graphing them using Gnuplot. Unfortunately I don't have anything finished to offer you.
185  Using Arduino / Installation & Troubleshooting / Re: Wrong code prevents upload new and correct sketch on: July 12, 2012, 03:36:31 pm
See if this works:

Pause the sketch by pushing the reset button and keeping it pressed.
Upload new sketch (still holding reset button)
Wait until the Arduino IDE reports the binary sketch size in the debug window and then immediately release the button.
Hopefully your sketch will be uploaded before the board locks up.

You might have to try several times to get the timing right.

Edit: CrossRoads beat me to it. We're talking about the same thing.
186  Using Arduino / Installation & Troubleshooting / Re: Serial port is grayed on: July 12, 2012, 03:26:05 pm
If TX is on all the time you're most likely locking the USB interface with to much serial data. It sounds an awful lot like a problem with the firmware.

Run this:
lsusb -v -d 2341: | grep -i bcdDevice
A good board should have version 0.01
A board that needs a new firmware would have 0.00

If it's not the firmware,
do you have access to a Windows computer? You could try connecting your board to that one and install the drivers. See if that makes a difference.
Maybe you could upload some other sketch (blink?) from Windows to see if it has anything to do with serial data from the sketch you have in flash.

Is there a way to debug the program? Should I download the source and try tu run it from source?

I'm not sure which program you are talking about.
If you mean the Arduino IDE, yes if the one you have is installed from some repository then download the latest version from instead, unpack it and just run it from the unpacked dir.
Which version are you using now?
187  Using Arduino / Project Guidance / Re: Changing location of Libraries folder on a Mac on: July 12, 2012, 01:33:16 pm
I haven't used a Mac but on other platforms you can put your custom libraries in a "libraries" folder within your sketchbook.
If you can do this and place your sketchbook in your dropbox folder you should be ok.

188  Using Arduino / Installation & Troubleshooting / Re: Serial port is grayed on: July 12, 2012, 12:02:23 pm
Is the TX light on or flashing while the board is connected?

If you for some reason still is affected by the old firmware bug and has a board sending lots of serial data this trick would make the port show up:
Keep the reset button pushed while plugging in the board to USB.
With the reset button still pressed, navigate to the tools menu and see if you can access the serial port menu while reset is held.
This prevents any sketches in flash to run but the 8u2 chip will be active and idling so the board should respond.
189  Using Arduino / Installation & Troubleshooting / Re: Serial port is grayed on: July 12, 2012, 10:08:02 am
@perhof: That is true, but it should not be necessary to login as root. To me, that has bad security problems.

You're absolutely right.
I just thought that we shouldn't get stuck on device permissions when it was stated that it had been tried as root.
And I think that an Ubuntu user, at least the admin user created during install is a member of the dialup group by default.
190  Using Arduino / Installation & Troubleshooting / Re: Serial port is grayed on: July 12, 2012, 09:46:50 am
$ ls -l /dev/ttyACM*
crw-rw---- 1 root dialout 166, 0 jul 12 10:57 /dev/ttyACM0

You must be a member of the dialout group OR be root.
191  Using Arduino / General Electronics / Re: RF Transmitter and Receiver WRL-10535 and WRL-10533 on: July 11, 2012, 06:40:48 pm
Worse case scenario about 15 meters, but mostly within 10 meters.

I'd say you should reach 15 meters no matter what kind of wire and which of the antenna lengths you select as long as it's a length that matches the frequency.
Selecting any other length might not help.

I'm still playing with stuff just testing and prototyping right now.  Got some transceivers to try out next if I can figure out how to wire them.  They just use a bit more power which I'm not crazy about since I'm trying to keep these things low enough to run off batteries for a good amount of time.

What's the application if i may ask?
192  Using Arduino / Installation & Troubleshooting / Re: Serial port is grayed on: July 11, 2012, 06:24:49 pm
cd /dev
ls tty*

to actually show the permissions it should be
ls -l tty*
but as mentioned - the IDE is already running as root so it shouldn't be permissions.

Is the board showing up as a serial port at all?
ls /dev/ttyACM*
You should see a device named ttyACMx. Most likely ttyACM0.

If not, check if it's listed if you issue this command
I don't remember the exact name and ID of the board but I believe it starts with Atmel.

If it is listed by lsusb but doesn't show up as a tty device, search through /var/log/dmesg for errors related to the device id shown by lsusb.

If it is indeed listed as /dev/ttyACMx but doesn't show up in the IDE it might be locked by some other process.
There could also be something wrong with your Arduino installation/configuration.

193  Using Arduino / General Electronics / Re: RF Transmitter and Receiver WRL-10535 and WRL-10533 on: July 11, 2012, 03:00:59 pm
17cm is for 434 MHz.

Right, it should be 17. My bad.
I've also read 13 in some guides but it should be 17 for 434MHz and that's what I'm using.

315 MHz ~1.5ft,
1/4 of that, ~11cm, should work well

What is 11cm? 1/8 wavelength?
Guess it should work too.

Experiment a bit. Try 11-12 cm and route it around inside your enclosure and try 24 cm and make more loops. It doesn't necessarily have to stick out.
Maybe it has to if you use a metal enclosure.

Any piece of wire should do. I've used thick single core copper without plastic insulation, thin single core jumper wire with insulation, a multi core wire with insulation from an ethernet cable (there are eight of these in each cable) and that worked fine too. I don't know what's best in theory.

The alarm devices you're mentioning are probably using coil antennas or pcb loop antennas which are a bit harder to get right.
Maybe someone here can tell what dimensions you would need for that.

What kind of range are you aiming for?
194  Using Arduino / General Electronics / Re: RF Transmitter and Receiver WRL-10535 and WRL-10533 on: July 11, 2012, 03:18:57 am
Ok scratch that.  Looks like I've got at least one bad receiver.  Swapped out the receiver with my 2nd receiver and now I'm receiving messages from one end of the house to the other (about 20 meters).  It was missing some signals at that range but it was picking up at least 3 in 5.

That's more like it but you shouldn't stick to that 13 cm antenna. 13 cm is for 434MHz.
The wavelength at 315 MHz is 95.2 cm so a 1/4 wavelength antenna would have to be around 24 cm.

195  Using Arduino / General Electronics / Re: RF Transmitter and Receiver WRL-10535 and WRL-10533 on: July 10, 2012, 01:25:31 pm
I realize you've already checked the comments at Sparkfun since you posted a question there yesterday smiley
By the comments it looks like these particular modules are very sensitive to interference. I don't know if 315MHz is worse than 434MHz.
I've heard of wireless alarms and other equipment that more or less jam these open frequencies.
Maybe you could try your modules at another location to see if you have a problem in your area?

I've been using this type of modules for remotes and wireless sensors and I never had a problem:
You can miss a packet of data once in a while but it usually works very well.
I open a garage door from within a car about 60 meters from the garage. Receiver and it's wire antenna is placed inside the garage.
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