Wednesday, January 12, 2011

IMU experiment 1/12/2011

After much head scratching the IMU began to spew forth loads of relevant data!
when the sensor is shook in only the x direction you can observe the waveform in the red data stream, when it is shook in only the y direction you can observe the waveform in the green data stream, and when shook in the z direction there is a waveform in the blue data stream.

First issue:
The baudrate for communication between the arduino and python was set at 115200 bits per second, and this caused an accumulation of lag in the data.

Solution:
Resetting the baud rate to 4800 eliminated the lag.

Second issue:
The arduino code correlated pins to the accelerometer data incorrectly. It was searching for data on pins 1-5 while the data was being fed out on pins 0-4.

Solution:
Reassign the pin numbers to the correct variables on the arduino.

Third issue:
The signal is choppy if the wires aren't connected to the board in a specific way. I think this is due to a poor quality wire connector.

Proposed solution:
Solder the wires directly to the sensor.

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