module: second_order_lowpass_butterworth
description: 
parameters:  double fp, double gain
inputs:  double in
outputs:  double out
classes:  Filter filt("K","1 + 1.4142/(2*pi*fp)*s + 1/(4*pi^2*fp^2)*s^2","K,fp,Ts",gain,fp,Ts); 
static_variables:  
init:  
filt.reset(0.0);

end:  
code:  
filt.inp(in);
out = filt.out;


