wiibalanceplot

What is this

Use wii balance board to track barycentre and draw on display. Combine below two

• GUI scalesgui.py

• BT communication use wiiboard-simple

• Demo

Requirements

• python-pygame
• python-bluez
• bluez-utils
• Bluetooth

Usage

./balanceplot.py

Filiter for AD convert

• Sample code

     public void onSensorChanged(SensorEvent event)
     {
          // alpha is calculated as t / (t + dT)
          // with t, the low-pass filter's time-constant
          // and dT, the event delivery rate
  
          final float alpha = 0.8;
  
          gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
          gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
          gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];
  
          linear_acceleration[0] = event.values[0] - gravity[0];
          linear_acceleration[1] = event.values[1] - gravity[1];
          linear_acceleration[2] = event.values[2] - gravity[2];
     }
  

• Methodology

Sample Rate

According to log, 100 saples in 1000 ms