import pyb, array

# Create the DAC that drives our audio.
# DAC(1) drives pin X5; DAC(2) drives pin X6.
# Bits is 8 or 12.
dac = pyb.DAC (1, buffering=False)

# 'Freq' is in cycles/second; middle C on a piano is 261Hz.
# 'Volume' is a number from 0-10.
# The note we play is a sawtooth.
def play_note (freq, volume):
    global buf
    assert volume>=0 and volume<=10, "Illegal volume setting"
    Vmax = int(volume*255/10)
    buf = array.array ('B', range(Vmax))
    dac.write_timed (buf, int(freq*Vmax), mode=pyb.DAC.CIRCULAR)

############################
### Your code starts here
############################
play_note (1000, 3); pyb.delay(500)
play_note (1000*1.0595, 3); pyb.delay(500)
play_note (0,0)