Today the attempt to use two sensors at a time got little success. Used two srf05 modules to plot graphs. Both the graphs were out of phase as expected.
I will take a break of one day to prepare for my B.Ed. Exam which is on 11th June.
Will be back on 11th June evening with detailed experiment update.
Today In the morning wrote programs for two sound experiments.For reference, Used programs written by Dr. Ajith Kumar, the inventor of ExpEYES.
Tried the experiments with square waves SQR1 and SQR2 from ExpEyes kit. We are also working on preparing a stand alone board which can give variable frequency sine waves. This will be useful in experiments like interference of sound, phenomena of beats and Lissajous figures.Uploaded these programs to Git repo.
Studying and trying filtering techniques for plotting smooth graphs.
Started working on Experiments with sound
Yesterday night I tried to plot graphs using the time and position data obtained from SRF 05 sensor. I just moved a notebook in-front of the sensor, up and down and could plot position against time . But the plots were little noisy and giving unusable estimates of the acceleration.
Today spent time to understand some filtering techniques.
Google Search led me to the Kalman filter which is is a mathematical method that uses noisy measurements observed over time to produce values that tend to be closer to the true values of the measurements and their associated calculated values.
I have downloaded some docs on filtering techniques and now I am studying them. I think I should take help from my mentors and fellow coders from FOSSASIA………
Before I go to sleep will try to finish the setup to generate sine waves for sound experiments……..Its almost ready …..:)
Used two microHope boards to convert square wave into a sine wave. And this is the ultrasonic sensor set up ……….. appears complicated 🙂
Any suggestion to plot smooth graphs in python from noisy measurements????