Hi all, I am a beginner with electronics and I would like to discuss if my concepts can be realised at all.
Basically I would like to hook up 7 bowls/cups to my computer and measure if they are being "poured", i.e. how much they are tilted.
If my research is correct, I would probably use a 2-axis accelerometer for each of the bowls. The tutorial at http://www.arduino.cc/en/Tutorial/AccelerometerMemsic2125
seems not too hard to grasp. However, I have some questions:
- What about the rather large number of sensors I need? There are 14 digital pins on the Arduino, does this mean I could actually connect 7 of these MEMSIC sensors and read their output, just by modifying the tutorial code? Are there any bandwidth issues?
- What is the main difference/advantage of using analog sensors, such as the ADXL* series -- http://www.sparkfun.com/commerce/product_info.php?products_id=847
-- would you use these at all? There are only five analog pins on the board -- does this mean I would need to connect four Arduino boards to the computer in order to be able to use seven analog sensors? Or would there be any other way?
- Would it be possible to place the sensors on the bottom of the bowls and secure the cable to the bowl somehow, and connect everything to the board with a cable length of about one meter each? How fragile are such setups? Would people accidentally rip my installation apart all the time?
Thank you for your time!