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46  Using Arduino / Sensors / How to determine sensor is compatible with Arduino UNO? on: May 08, 2012, 10:42:56 am
Hi all,

i'm new to arduino and would like to know how you can determine that a sensor is compatible with an arduino board.

I would like to purchase http://export.farnell.com/invensense/itg-3200/ic-gyro-tri-axis-2000-deg-s/dp/1858279RL but i'm not sure whether it works.


EDIT:

my search has brought me some understanding but has raised several questions more:

In another topic (http://arduino.cc/forum/index.php/topic,104951.0.html) about which sensors can be directly connected to the arduino UNO, krodal states:

It's not hard. The only problem is that most sensors use 3.3V. But the Arduino has 3.3V onboard for those sensors.

The accelerometer i want to use in my project runs on 3V (http://www.bosch-sensortec.com/content/language1/downloads/BMA150_Flyer_Rev1.3_14JAN2008.pdf)

I was in the understanding that i could not use this sensor directly on the arduino UNO since the arduino runs on 5V (and it would fry the sensor). But if you look at the arduino picture:



You see that at the bottom there is indeed a pin which states 3.3V.  Does this mean that the board can run on 3.3v as well, or what is the pin for?

in the tutorial on arduino.cc (http://www.arduino.cc/en/Tutorial/ADXL3xx) it says that the example uses the breakoutboard from sparkfun. http://www.sparkfun.com/products/9814 But it seems that even that board requieres 3.3V. How can they manage?



Thank you,

Jorrit
(i've also put this question in the topic list)
 

Please advice and explain!

Thank you
47  Using Arduino / Project Guidance / Re: Advice needed on project involving wireless accelerometer data transmission on: May 08, 2012, 10:04:41 am
Ok thank you

i'll go ahead and order myself some!
48  Using Arduino / Project Guidance / Re: Advice needed on project involving wireless accelerometer data transmission on: May 08, 2012, 09:41:50 am
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In order to connect sensors to the board i would need to solder or use a breadboard right?
No, but a breadboard makes the wiring a lot neater.

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But would i need also one receiver unit on the laptop side per accelerometer?
Draw yourself a picture. There are 6 accelerometers connected to one Arduino (maybe - you need to see if that is even possible. Which pins do your accelerometers connect to?). The Arduino then sends data to one XBee to transmit.

It should be trivial to figure out how many (1, one, less than 2, just slightly more than zero) receivers you need.

I will NOT be connecting 6 accelerometers to one arduino. Each sensor has it's own board. Thus, on each board, there should be one xbee shield and a xbee transmitter. From the documentation i found that one receiver can receive from more than one transmitter.
49  Using Arduino / Project Guidance / Re: Advice needed on project involving wireless accelerometer data transmission on: May 08, 2012, 07:51:22 am
Thanks for the reply,

so i think i'll take the 2009 board then. In order to connect sensors to the board i would need to solder or use a breadboard right?


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And if yes, would i need 6 or can just 1 receiver work for all accelerometers?
You are connecting the accelerometers to the Arduino, not the XBee, aren't you? If so, then you need one XBee with shield per Arduino.
But would i need also one receiver unit on the laptop side per accelerometer?

thank you
50  Using Arduino / Project Guidance / Advice needed on project involving wireless accelerometer data transmission on: May 08, 2012, 06:51:56 am
Hi all,

I am new to arduino and i must say that the sheer amount of modules is overwhelming. Before i spend too much money on modules i don't fully need i wanted to ask you for advice.

For my thesis project i need to capture accelerometer data from persons when they are in conversation. Since the conversations will be on the street I need the data transmitted wirelessly.

First of all i need 6 accelerometers. I won't need a gyroscope per se, so i go for: http://iprototype.nl/products/components/sensors/ADXL345

The data from the accelerometer i need to read with an arduino board, as i understand from http://arduino.cc/en/Tutorial/ADXL3xx. What is the difference between the Duemilanove and the Arduino Uno? Except for the price?

Then i need to send this data to my laptop, for monitoring and storing. This i can do by usb cables but i prefer a wireless connection. Herefore i would need a wireless Xbee shield, is this correct? Or are there other options such as the arduino Bluetooth Board? But the BT board is quite expensive and i don't think i will use its full potential. I read that an XBee shield is the best value option, see http://arduino.cc/en/Main/ArduinoWirelessShield. But do i need a receiving unit as well? And if yes, would i need 6 or can just 1 receiver work for all accelerometers?
Also, would the Xbee requiere that there is a wifi connection available?


Please share your thoughts on this!

bye
jorrit




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