Using an XBee, Arduino, and some sensors (accelerometer, pressure sensor), we put together this wireless movement/sniffing monitor. The device is powered by a 3.7V rechargeable Lithium Ion coin cell. The small (4cm x 4cm) board connects via a magnet so it is easy to put on and off. Optional LEDs can be used for tracking. I am using the native ADCs on the XBee for passing signals.
In the
next post I will put the Arduino code and circuit for receiving the signal from the sensor board.
The accelerometer is Analog Devices ADXL335:
http://www.analog.com/static/imported-files/data_sheets/ADXL335.pdf
The amplifier for pressure sensor is Analog Devices AD627:
http://www.analog.com/static/imported-files/data_sheets/AD627.pdf
The pressure sensor is Honeywell 24PCAFA6G:
http://sccatalog.honeywell.com/pdbdownload/images/24pc.series.chart.5.pdf
The magnetic clip is made so as to connect the pressure sensor to a cannula on the other side of the connector and to prevent arbitrary rotation.
Here is a video of the magnetic clip:
Here are pictures of the device:
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| Front of board with XBee removed. Pressure sensor and magnetic attachment on bottom. |
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| Back of board has battery clip. |
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| Front of board with XBee. |
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| Magnetic attachment around pressure sensor and mating piece (right). |
Here is the link to the project files and some additional information below:
https://docs.google.com/folder/d/0Byu6zHhzDPqVQlEtMFBaeHRZUlE/edit?usp=sharing
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| The PCB Layout that I used. |
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| The circuit schematic. |
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