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121  Using Arduino / Networking, Protocols, and Devices / Re: Wire lib vs I2C lib - interrupts, performance. on: February 26, 2013, 06:57:22 pm
If you scroll down the page on you'll find a pretty detailed timing comparison between the I2C and wire library ;-)
That should explain any performance differences.
122  Using Arduino / Microcontrollers / Re: Teensy 2.0 Teensy Loader Error on: February 23, 2013, 07:34:36 pm
Perhaps you want to post your problems on the forum dedicated to the teensy boards:
123  Using Arduino / Networking, Protocols, and Devices / Re: Wifi connection???????? on: February 20, 2013, 06:56:16 pm
I read through your initial post again.
If you are interested in a real WiFi solution I would currently not recommend any WiFi shield and suggest an alternate solution using a " standard" Ethenet shield connected via short Ethernet Cable to a little pocket router. That way you will not have to rewrite code but still are able to use a WiFi connection:,149865.0.html
124  Using Arduino / Networking, Protocols, and Devices / Re: DIY Arduino WiFi? on: February 20, 2013, 06:51:18 pm
PaulS....I like your humor.....most of the time. This was the second time today that my kids asked me what I was laughing about when reading forum posts. That made an otherwise crappy day much better.

Here you go.
125  Using Arduino / Networking, Protocols, and Devices / Re: Arduino - Wifi - iPhone on: February 20, 2013, 06:43:48 pm
Just to summarize a few things

1. Using a little ( half the footprint of an iPhone 4 and about twice as thick)  TP-Link router will enable you to connect directly with the iPhone to the router/Arduino because that little router comes configured as an Access Point out of the box. You plug it in, it shows up in the WiFi connections in your iPhone and you're in business.

2. The TP-link TL WR703N is available through eBay ($20+) and I've had no one preventing me using it in my projects due to a missing FTZ certification YMMV. The user interface is in Chinese. Google translate helped me.

3. If you have a home router you can have the TP-Link also connect to your home router and access the Arduino wirelessly through your iPhone<-->home router <-->Tp-Link<-->Ethernet <-->Arduino. That is an interesting setup if your project is located somewhere inaccessible for a cabled Ethernet connection. I use this set-up in my projects (

4. You can also omit the Ethernet card and connect the TP-Link WR703N through its USB port directly to the Arduino, but it requires you to flash an OpenWRT Linux based router software on it to begin with. I have no handson experimece with this, but I believe that this will not work with Ardumote as Ardumote usesthe UDP protocol for communication and I am not aware of an Arduino library that supports UDP over USB. If that ever interests you, it is not required to purchase a preflashed one of eBay, unless The fine folks at the OpenWRT website are untruthful ;-)

5. The fact that Ardumote ( and TouchOSC, which I am using in my projects) work through the UDP protocol is also the reason why I would be careful with using a Bluetooth module. Getting that to work will almost always require you to socket programming and worse ;-)

6 Using Ardumote with the Ethernet shield directly or through the TP-Link Wr703n has worked flawlessly in my projects but I have since migrated to TouchOSC.
126  Using Arduino / Networking, Protocols, and Devices / Re: DIY Arduino WiFi? on: February 20, 2013, 06:14:05 pm
This should fit the bill.
127  Using Arduino / Networking, Protocols, and Devices / Re: Wifi connection???????? on: February 19, 2013, 08:00:52 pm
No. You just need to carefully read what's written before even attempting to touch the keyboard. The Xbee is N O T a WiFi solution. It's adheres to a different wireless standard but NOT WiFi. E.g. You cannot connect directly to it from an iPhone or Android phone or connect it to your internet router.
128  Using Arduino / Networking, Protocols, and Devices / Re: Arduino - Wifi - iPhone on: February 19, 2013, 07:56:41 pm
Perhaps because you cannot connect an iPhone to an Ethernet cable, unless ther is some form of an adapter that I am not aware of.

I agree with Pauls, however, that using a WiFi shield is not nearly as trouble free as an Ethenet shield.
However there is a solution that is almost as trouble free alas at a little added expense.
You can connect a little pocket router Tp- Link WR703n etc, to the Ethenet shield and voila, you're in WiFi business.
129  Using Arduino / Networking, Protocols, and Devices / Re: Wifi connection???????? on: February 19, 2013, 05:02:43 am
The Wireless SD shield is not a WiFi shield. WiFi is not the same as Wireless.
The Ardino Wirless SD shield needs to be equipped with an XBee wireless module. You did not mention what module is installed only the shield.
Whatever you do have installed however I'd believe makes no difference. The library you are referencing is meant for the specific wifi hardware on the Arduino WiFi shield and will not work with the Wireless SD shield.

Please put your code in code tags when posting!
130  Using Arduino / Networking, Protocols, and Devices / Re: pass caps for the nRF24L01 on: February 18, 2013, 10:04:51 pm
To answer one of your question, the smaller cap needs to sit closer to the radio. These capacitors are needed to filter out noise on the power supply side and have not much to do with the 2.4GHz side as Docedison mentioned.

That does not need to be on a spec sheet as adding decoupling caps is very common practice ( as Docedison also mentioned) and one of the very first things I learned ( the hard way :-) when I started with electronics 20+ years ago. That is not specific to these transceivers!
131  Using Arduino / Networking, Protocols, and Devices / Re: Wifi connection???????? on: February 18, 2013, 09:55:36 pm
When asking for help, please consider to provide as much information as you can with the minimum being:

- Links to the exact hardware specs that you are using
- the code/ sketch that you intend on running on your Arduino

And please put the code in code tags so its actually readable. Without that minimum we cannot really provide much help!
132  Using Arduino / LEDs and Multiplexing / Re: Hardware Help - Automotive LEDs on: February 16, 2013, 12:20:56 pm
It would probably help you if you scan through the many posts in the LED section of this forum.
The first thing you'll learn is that running LEDs in a parallel configuration is not good practice as LEDs are constant current devices. that also means that you need tight current control, and not voltage control.

Automotive applications can be challenging as the voltage/and current levels are quite varying and most automotive LED chips are buck/boost LED drivers for that very reason.  Also, you may want to check what laws apply in your country of residence. You may get away with tinkering around with these things in the USA, however, in Germany the police woud remove you vehicle from the streets immediately and you'd be heavily fined for tinkering around with elements on tha car that are considered safety relevant.

I am not suggesting not do it, however, I think for a first Arduino project you may have bitten off a little more that you can chew. Perhaps you want to start with something less complex that will have a better chance of success and keeping you motivated for the more challenging project you have in mind.
133  Using Arduino / Programming Questions / Re: Using other IDEs to develop on: February 13, 2013, 07:49:26 pm
If you're familiar with Eclipse your can try to use the Arduino Eclipse plugin:

There a a few lengthy threads about it here on the forum. I've started using a beta version with my Teensy++2 board and it works nicely for me.
134  Using Arduino / Networking, Protocols, and Devices / Re: serial to osc on: February 04, 2013, 07:03:53 pm
If this is the most convenient way I cannot answer, however, you can sent OSC directly from an Arduino Board to a PC via ArdOSC.

You need to equip your Arduino with an Ethernet card as OSC uses the UDP protocol.
You can also do this per WiFi by connecting a little pocket router o the Ethernet Shield. ive done this in two set- ups. While you may be tempted to use a WiFi shield, don't do it!
I believe the only WiFi shield this may work with is the WiFly from Sparkfun.
135  Using Arduino / Networking, Protocols, and Devices / Re: Is I2C the best way to mix different speeds and voltages ? on: February 02, 2013, 08:30:02 am
If I remember correctly your can have 119 devices on the I2C bus. Some suggest its 128 but a good number of the addresses are reserved. Then of course not every I2C device allows to freely set its address. In case of address conflicts you may need to use a multiplexer.

Nick Gammons website is a very good resource for I2C " stuff" ( amongst many other things).
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