Dear all,
I have some doubts. I am trying to run the oscilloscope application modified for reading just the accelerometer. 1. For varying the sampling frequency is enough to change the number (in this case 4) in the following command: call Timer.start(TIMER_REPEAT, 4) ? 2. I have read that this timer interval must be in <b>microseconds</b> (1/1024second) is it right?. 3. So in this case I am sampling at 256Hz? 4. I also know that the timer cannot support an arbitrary range of intervals. Which is the valid interval for the MICA2? 5. The Buffer_Size is the number of packets being sending. The default number in my case is 10. I tried to reduce it to 1 and fix the timer interval of recording data with 1024 (1Hz) but I obtain the following message: "Receive error for net.tinyos.oscope.oscopemsg (AM type 10): invalid length message received (too short) 6. I am using the java interface to see the results (sampled at 256 Hz) but the accelerometer seems not to have enough sensibility .... 7. I want to record a specified interval of data (like 10 minutes of data) how should I do this? Thank you very much for your answers Rafael Aguilar Civil Engineering PhD Student Departamento de Engenharia Civil Universidade do Minho - Portugal
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