#!/usr/bin/env python3
# Control relay using sound sensor.
# Clap twice to turn on or off.
#  (c) 2018 Bradley Knockel

# If using hardware SPI, make sure you've enabled SPI using
#   sudo raspi-config    (in Interface Options)
# Then reboot the Pi.

# How to install the Adafruit modules for ADC...
#   sudo apt-get install python3-pip
#   sudo pip3 install adafruit-mcp3008

# sound sensor (KY-037)...
#   +  -> 5V
#   G  -> GND
#   A0 -> voltage divider -> ADC pin 1 (channel 0)
# Sadly, it picks up background noises and any breeze over microphone.

# Voltage divider
#   R1 = 1000 ohm + 1000 ohm
#   R2 = 5100 ohm
# The output of KY-037 should never be much more than 3.3 V unless very loud,
# but the voltage divider is for my sanity.

# ADC (MCP3008) pins...
#   VDD (16) to 3.3V
#   VREF (15) to 3.3V
#   AGND (14) to GND
#   CLK (13) to GPIO 11  (sclk) (must be at least 10 kHz)
#   DOUT (12) to GPIO 9  (miso)
#   DIN (11) to GPIO 10  (mosi)
#   CS/SHDN (10) to GPIO 8  (ce0) (must be pulled HIGH/off between conversions)
#   DGND (9) to GND

# Note that the faster SPI and ADC are, the higher the threshold needs to be.
# This is because if you sample much more, you are bound to get larger
# fluctuations. Or, you could add a delay in the code.

relayPin = 21
# or pin that controls the transistor that controls a relay

soundSensor = True
volumeThreshold = 5  # at least 1
onTimeMax = 1  # max minutes to be on before auto turn off
waitMin = 0.1  # min s to wait after first clap for second clap
waitMax = 1.0  # max s to wait after first clap for second clap
# waitMax also corresponds to the dead time after changing state



import RPi.GPIO as IO
IO.setmode(IO.BCM)
IO.setup(relayPin, IO.OUT)
IO.output(relayPin, 0)


import time




import Adafruit_MCP3008

## Software SPI configuration:
#CLK  = 11
#MISO = 9
#MOSI = 10
#CS   = 8
#mcp = Adafruit_MCP3008.MCP3008(clk=CLK, cs=CS, miso=MISO, mosi=MOSI)
     
## Hardware SPI configuration:
import Adafruit_GPIO.SPI as SPI   # Adafruit's spidev module
mcp = Adafruit_MCP3008.MCP3008(spi=SPI.SpiDev(0,0))



if soundSensor:
  val2 = mcp.read_adc(0)

on = False
time1 = time.time() - waitMax  # time at first clap



try:

  while 1:
    if soundSensor:

      time.sleep(0.001)
      val1 = val2
      val2 = mcp.read_adc(0)
      now = time.time()

      if abs(val1-val2) > volumeThreshold:
        if now-time1 > waitMin and now-time1 < waitMax:
          on = not on
          if on:
            IO.output(relayPin, 1)
            timeOn = now
          else:
            IO.output(relayPin, 0)
          time.sleep(waitMax)
          val2 = mcp.read_adc(0)
        elif now-time1 > waitMax:
          time1 = now
        else:
          pass
          # maybe put some code here to prevent continuous sound
          # from triggering the code


      if on and now-timeOn > onTimeMax*60:  # auto turn off
        on = False
        IO.output(relayPin, 0)
        time.sleep(waitMax)
        val2 = mcp.read_adc(0)


    else:    # turn on and off forever

      IO.output(relayPin, 1) # on
      time.sleep(10)
      IO.output(relayPin, 0) # off
      time.sleep(10)



except:
  pass

# cleanup
IO.output(relayPin, 0)
IO.cleanup()