File content as of revision 0:1883d922ada8:

#include "mbed.h"
#include "HIDScope.h"
#include "biquadFilter.h"        // Require the HIDScope library

//Define objects
AnalogIn    emg(A0); //Analog of EMG input
Ticker      sample_timer;
HIDScope    scope(2);        // Instantize a 2-channel HIDScope object
/*The biquad filters required to transform the EMG signal into an usable signal*/
biquadFilter filterhigh1(-1.1430, 0.4128, 0.6389, -1.2779, 0.6389);
biquadFilter filterlow1(1.9556, 0.9565, 0.9780, 1.9561, 0.9780);
biquadFilter notch(-1.1978e-16, 0.9561, 0.9780, -1.1978e-16, 0.9780);
biquadFilter filterlow2(-1.9645, 0.9651, 1.5515e-4, 3.1030e-4, 1.5515e-4);

/* 
 */
void filter()
{
    /* Sample the EMG using the 'read' method of the 'AnalogIn' variable named 'emg' */
    double emg_value = emg.read();
        double signalpart1 = filterhigh1.step(emg_value);//Highpass filter for removing offset and artifacts
        double signalpart2 = abs(signalpart1);//rectify the filtered signal
        double signalpart3 = filterlow1.step(signalpart2);//low pass filter to envelope the emg
        double signalpart4 = notch.step(signalpart3);//notch filter to remove 50Hz signal
        double signalfinal = filterlow2.step(signalpart4);//2nd low pass filter to envelope the emg
        scope.set(0,emg_value);//emg_value
        scope.set(1,signalfinal);
        /* Second, set the sampled emg value in channel zero (the first channel) in the 'HIDScope' variable named 'scope' */
    /* Repeat the step above if required for more channels (channel 0 up to 5 = 6 channels) */
    /* Finally, send all channels to the PC at once */
    scope.send();
}

int main()
{
    /**Attach the 'sample' function to the timer 'sample_timer'.
    * this ensures that 'sample' is executed every... 0.002 seconds
    */
    sample_timer.attach(&filter, 0.002);

    /*empty loop, sample() is executed periodically*/
    while(1) {}
}