# Project#5 - Let's make a sound detector
# Connections:  Add jumpers to the LED headers (Labelled G16BLU and G17RED) to the left of the coin battery.
# Also add jumpers to the GP15 S1 header and GP14 S2 headers to the right of the coin battery socket.
# The DIP swtiche channels are tied to GPIOs 18-thrrough 21
# Add a jumper to the BUZ/G22 header to connect GP22 to the buzzer control circuit.
# Add a jumer to the MIC/AD1 header to connect the AD1/GP27 pin to the microphone output

import machine   # Think of "import" as importing a library.  This library allows for us to use GPIOs
import utime     # This "library" allows for us to tell time if connected to the internet, and use delays like 'utime.sleep(1)'
#The below declarations are new since project#4
Buzzer = machine.Pin(22, machine.Pin.OUT)    #Setup the Buzzer, which is connected to GPIO 22. Declare it as an output.
Microphone = machine.ADC(27) # Setup GPIO27 to act as the ADC input for the microphone.  This is the AD1 line
#
Button = machine.Pin(15, machine.Pin.IN)  #Setup the SEL1 button pin to GPIO 15.  Set it as an input and name it "Button"
Button2 = machine.Pin(14, machine.Pin.IN)  #Setup the SEL2 button pin to GPIO 14.  Set it as an input and name it "Button2"
DIPA = machine.Pin(21, machine.Pin.IN)  #Setup DIP Switch Channel-A as an output
DIPB = machine.Pin(20, machine.Pin.IN)  #Setup DIP Switch Channel-B as an output
DIPC = machine.Pin(19, machine.Pin.IN)  #Setup DIP Switch Channel-C as an output
DIPD = machine.Pin(18, machine.Pin.IN)  #Setup DIP Switch Channel-D as an output
LEDRED = machine.Pin(16, machine.Pin.OUT)   # Set up GPIO16 as an output, and name it LEDRED
LEDBLU = machine.Pin(17, machine.Pin.OUT)   # Do the same for GPIO17
LEDRED.value(0)   # Turn the red LED off.  If you set it to (1), then you'd be turning it on
LEDBLU.value(0)   # Turn the blue LED off.  If you set it to (1), then you'd be turning it on
state = 0  # state is a variable/storage register.  Set it to a value of 0.
hold = 0   # hold is another variable that we'll use to store data in
conversion = 3.3/(65535) # Conversion helps us to turn ADC readings (Numeral values) into a voltage representation.
# 3.3v is the full scale voltage.  0-65565 is the full 16-bit scale value used for ADC conversions.  0000000000000000-1111111111111111

def NoiseTest():  #This function waits for noise.  When noise is detected, the buzzer sounds
    print("Waiting for noise...")  #Print this to the shell
    global state    # Setting variable "state" as a global means that it will be kept intact across functions
    state = 0       # Reset state to a value of 0
    LEDBLU.value(1) # Turn on the blue LED
    while state == 0: # Loop the following while state equals 0
        hold = Microphone.read_u16()  # Take a 160-bit analog to digital reading from the microphone and place it into the 'hold' variable.
        hold = hold*conversion  # hold equals itself multiplied by 'conversion'.  This will give us a voltage representation.
        if(hold > 2):  # if the signal is higher than 2v, then a loud noise has been detected. If so, change state to 1 to end this while loop
            state = 1  # See above
    LEDBLU.value(0)   # Turn the LED off
    Buzz()             # call the buzz() function
    print("Noise detected... Moving on!") # Print this to the shell.  This is the end of this function.
       
def Buzz():  # This function beeps the buzzer 5 times
    print("Buzzer on...")  # Print this to the shell
    for i in range(5):     #  This is a FOR loop, or 'Range"  It is set to loop the following code 5 times.
        Buzzer.value(1)    # Turn on the buzzer
        utime.sleep(0.25)  # Delay of 250ms, or 1/4 Seconds
        Buzzer.value(0)    # Turn the buzzer off
        utime.sleep(0.25)  #250ms delay
    print("Buzzer off")    # Once looped 5 times, the range ends, and this will be printed to the shell
    # This is the end of this function

# The following is the main loop.  It will loop calling the NoiseTest() function over and over without end.
while True:
    NoiseTest()