1  # SPDX-FileCopyrightText: 2018 Isaac Wellish for Adafruit Industries
  2  #
  3  # SPDX-License-Identifier: MIT
  4  
  5  # Author: Isaac Wellish
  6  # Code adapted from Tony Dicola's CircuitPython code using the DS18x20 temp sensor
  7  # as well as John Park's CircuitPython code determining soil moisture from nails
  8  
  9  import time
 10  from adafruit_onewire.bus import OneWireBus
 11  from adafruit_ds18x20 import DS18X20
 12  import board
 13  import touchio
 14  import neopixel
 15  import analogio
 16  from simpleio import map_range
 17  
 18  # Initialize neopixels
 19  pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, brightness=.1)
 20  
 21  # set variables for capacitive touch inputs, later used for soil moisture variables
 22  touch = touchio.TouchIn(board.A1)
 23  touch2 = touchio.TouchIn(board.A2)
 24  
 25  DRY_VALUE = 3100  # calibrate this by hand!
 26  WET_VALUE = 4000  # calibrate this by hand!
 27  tempThreshhold = 43 #celius temperature of threshold for ideal compost temperature
 28  
 29  # Initialize one-wire bus on board pin A3.
 30  ow_bus = OneWireBus(board.A3)
 31  
 32  # Scan for sensors and grab the first one found.
 33  ds18 = DS18X20(ow_bus, ow_bus.scan()[0])
 34  
 35  # Initialize the light senor on board to use for neopixel brightness later
 36  light = analogio.AnalogIn(board.LIGHT)
 37  
 38  # Main loop
 39  while True:
 40  
 41      # SOIL MOISTURE READINGS
 42  
 43      # set capacitive touch inputs for nails to take in soil moisture levels
 44      value_A1 = touch.raw_value
 45      value_A2 = touch2.raw_value
 46  
 47      # take the average of both moisture levels
 48      avgMoist = value_A1 + value_A2 / 2
 49      print("Moisture level:",(avgMoist,))
 50  
 51      # TEMPERATURE READINGS
 52  
 53      # variable for temperature
 54      compostTemp = ds18.temperature
 55  
 56      # print the temperature
 57      print('Temperature: {0:0.3f}C'.format(compostTemp))
 58  
 59      # IF STATEMENTS TO DETERMINE STATE OF COMPOST
 60  
 61      # RED & YELLOW = TOO COLD & TOO DRY
 62      if((compostTemp<tempThreshhold) and (avgMoist<DRY_VALUE)):
 63          pixels[0] = (255,0,0)    # red
 64          pixels[1] = (255,255,0)  # yellow
 65          pixels[2] = (255,0,0)
 66          pixels[3] = (255,255,0)
 67          pixels[4] = (255,0,0)
 68          pixels[5] = (255,255,0)
 69          pixels[6] = (255,0,0)
 70          pixels[7] = (255,255,0)
 71          pixels[8] = (255,0,0)
 72          pixels[9] = (255,255,0)
 73  
 74          print("Not hot enough, too dry")
 75  
 76      # BLUE & YELLOW = TOO COLD & TOO WET
 77      elif((compostTemp<tempThreshhold) and (avgMoist>WET_VALUE)):
 78          pixels[0] = (0,0,255)    # blue
 79          pixels[1] = (255,255,0)  # yellow
 80          pixels[2] = (0,0,255)
 81          pixels[3] = (255,255,0)
 82          pixels[4] = (0,0,255)
 83          pixels[5] = (255,255,0)
 84          pixels[6] = (0,0,255)
 85          pixels[7] = (255,255,0)
 86          pixels[8] = (0,0,255)
 87          pixels[9] = (255,255,0)
 88          print("Not hot enough, too wet")
 89  
 90      # GREEN & YELLOW = TOO COLD & MOISTURE LEVEL OPTIMUM
 91      elif((compostTemp<tempThreshhold) and (avgMoist >DRY_VALUE and avgMoist<WET_VALUE)):
 92          pixels[0] = (0,255,0)    # green
 93          pixels[1] = (255,255,0)  # yellow
 94          pixels[2] = (0,255,0)
 95          pixels[3] = (255,255,0)
 96          pixels[4] = (0,255,0)
 97          pixels[5] = (255,255,0)
 98          pixels[6] = (0,255,0)
 99          pixels[7] = (255,255,0)
100          pixels[8] = (0,255,0)
101          pixels[9] = (255,255,0)
102          print("Not hot enough, right moisture level")
103  
104      # ALL GREEN = COMPOST AT OPTIMUM TEMPERATURE & MOISTURE
105      elif compostTemp > tempThreshhold:
106          pixels.fill((0,255,0))  # green
107          print("Compost Ready")
108  
109      # LIGHTING CONFIGURATION
110  
111      # print value of light sensor
112      print((light.value,))
113  
114      # map light snesor range to neopixel brightness range
115      peak = map_range(light.value, 2000, 62000, 0.01, 0.3)
116  
117      # print neopixel brightness levels
118      print(peak)
119  
120      # show neopixels
121      pixels.show()
122  
123      # update neopixel brightness based on level of exposed light
124      pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, brightness=peak)
125  
126      # pause for three seconds
127      time.sleep(3)
128  
129  # END PROGRAM