Transcript Chris report

Current Works
• Performed A/D conversion on all 4 XBee pins
• Implemented voltage dividers for input from IMU
– Discovered Op-Amp Buffer required and re-implemented circuit
• Successfully reading input from IMU wirelessly!
• Continued MATLAB implementation of parse code
– Seems to parse correctly but seems to miss packets
• Created LabVIEW implementation of parse code
– Successfully reads voltages from all 3 sensors for planar motion
and displays on graph
– Noticed that occasionally frame size varies or packet is lost and
voltage is recorded as 0 volts
• Will look into why this occurs
– Sample rate does not seem to be as low as set by the parameter
(sample ever millisecond), see included table
• Performed more research for second version (next slide)
Next Version
• Best solution seems to be:
– http://www.sparkfun.com/commerce/product_info.php?p
roducts_id=9184
– 6 Degrees of freedom IMU
– XBEE mount built in
– ATMEL ATMEGA microprocessor built in
• Downsides
– Uses Lithium polymer battery that will need to be
purchased along with recharger
– AVR Programmer not included but Microprocessor looks to
preprogrammed and supplied code should be sufficient
(will email company to verify)
Setting
(milliseconds LabVIEW measured
per sample) Seconds/sample
1000
3.7
100
0.26
10
0.063636364
1
0.064
What’s Next?
• Continue LabVIEW implementation
– Figure out why random zero values, calibration,
saving to a file
– Email XBEE manufacturer about sample rate
problem
• Continue MATLAB implementation
• Begin researching calibration techniques
• Order parts for final version