Generates a variable amplitude wavetable for use with FunctionGenerator.ino

arduino_wavetable_variable.py

# Variable Amplitude
 
import numpy as np
 
 
table = []
two_pi = 2*np.pi
res = 2000
top = 249
 
max_amp = 4.3                   # Measured Value
desired_amp = 0.9623
max_count = top*(desired_amp/max_amp)
 
def map_value(x, in_min, in_max, out_min, out_max):
    return (((x - in_min) * (out_max - out_min))/(in_max - in_min)) + out_min
 
for i in range(0,res):
    sine_value = np.sin(two_pi*i/(res-1))
    table.append(int(np.round(map_value(sine_value,-1,1,0,max_count),0)))
 
with open('wavetable.h', 'w') as wavetable:
    wavetable.write('#include "Arduino.h"\n')
    wavetable.write('const long length = '+str(len(table))+';\n');
    table = [str(x) for x in table]
    table_string = ', '.join(table)
    wavetable.write('const byte waveTable[] PROGMEM = {'+table_string+'};')