Create code.py

initial code for Compost Friend! guide by Isaac Wellish

Compost_Friend/code.py

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+# Author: Isaac Wellish
+# Code adapted from Tony Dicola's CircuitPython code using the DS18x20 temp sensor
+# as well as John Park's CircuitPython code determining soil moisture from nails
+
+from adafruit_onewire.bus import OneWireBus
+from adafruit_ds18x20 import DS18X20
+import time
+import board
+import simpleio
+import touchio
+import neopixel
+import analogio
+from simpleio import map_range
+
+# Initialize neopixels
+pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, brightness=.1)
+
+# set variables for capacitive touch inputs, later used for soil moisture variables
+touch = touchio.TouchIn(board.A1)
+touch2 = touchio.TouchIn(board.A2)
+
+DRY_VALUE = 3100  # calibrate this by hand!
+WET_VALUE = 4000  # calibrate this by hand!
+tempThreshhold = 43 #celius temperature of threshold for ideal compost temperature
+
+# Initialize one-wire bus on board pin A3.
+ow_bus = OneWireBus(board.A3)
+
+# Scan for sensors and grab the first one found.
+ds18 = DS18X20(ow_bus, ow_bus.scan()[0])
+
+# Initialize the light senor on board to use for neopixel brightness later
+light = analogio.AnalogIn(board.LIGHT)
+
+# Main loop 
+while True:
+
+    # SOIL MOISTURE READINGS
+
+    # set capacitive touch inputs for nails to take in soil moisture levels
+    value_A1 = touch.raw_value
+    value_A2 = touch2.raw_value
+
+    # take the average of both moisture levels
+    avgMoist = value_A1 + value_A2 / 2
+    print("Moisture level:",(avgMoist,))
+
+    # TEMPERATURE READINGS
+
+    # variable for temperature
+    compostTemp = ds18.temperature
+
+    # print the temperature
+    print('Temperature: {0:0.3f}C'.format(compostTemp))
+
+    # IF STATEMENTS TO DETERMINE STATE OF COMPOST
+
+    # RED & YELLOW = TOO COLD & TOO DRY
+    if((compostTemp<tempThreshhold) and (avgMoist<DRY_VALUE)):
+        pixels[0] = (255,0,0)    # red
+        pixels[1] = (255,255,0)  # yellow
+        pixels[2] = (255,0,0)
+        pixels[3] = (255,255,0)
+        pixels[4] = (255,0,0)
+        pixels[5] = (255,255,0)
+        pixels[6] = (255,0,0)
+        pixels[7] = (255,255,0)
+        pixels[8] = (255,0,0)
+        pixels[9] = (255,255,0)
+
+        print("Not hot enough, too dry")
+
+    # BLUE & YELLOW = TOO COLD & TOO WET
+    elif((compostTemp<tempThreshhold) and (avgMoist>WET_VALUE)):
+        pixels[0] = (0,0,255)    # blue
+        pixels[1] = (255,255,0)  # yellow
+        pixels[2] = (0,0,255)
+        pixels[3] = (255,255,0)
+        pixels[4] = (0,0,255)
+        pixels[5] = (255,255,0)
+        pixels[6] = (0,0,255)
+        pixels[7] = (255,255,0)
+        pixels[8] = (0,0,255)
+        pixels[9] = (255,255,0)
+        print("Not hot enough, too wet")
+
+    # GREEN & YELLOW = TOO COLD & MOISTURE LEVEL OPTIMUM
+    elif((compostTemp<tempThreshhold) and (avgMoist >DRY_VALUE and avgMoist<WET_VALUE)):
+        pixels[0] = (0,255,0)    # green
+        pixels[1] = (255,255,0)  # yellow
+        pixels[2] = (0,255,0)
+        pixels[3] = (255,255,0)
+        pixels[4] = (0,255,0)
+        pixels[5] = (255,255,0)
+        pixels[6] = (0,255,0)
+        pixels[7] = (255,255,0)
+        pixels[8] = (0,255,0)
+        pixels[9] = (255,255,0)
+        print("Not hot enough, right moisture level")
+
+    # ALL GREEN = COMPOST AT OPTIMUM TEMPERATURE & MOISTURE
+    elif(compostTemp>tempThreshhold):
+        pixels.fill((0,255,0))  # green
+        print("Compost Ready")
+
+    # LIGHTING CONFIGURATION
+
+    # print value of light sensor
+    print((light.value,))
+
+    # map light snesor range to neopixel brightness range
+    peak = map_range(light.value, 2000, 62000, 0.01, 0.3)
+
+    # print neopixel brightness levels
+    print(peak)
+
+    # show neopixels
+    pixels.show()
+
+    # update neopixel brightness based on level of exposed light
+    pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, brightness=peak)
+
+    # pause for three seconds
+    time.sleep(3)
+
+# END PROGRAM