Uses PiCamera to take a photo with a timestamped filename, then add some text with transparent 'underlays' and a logo. Will get the Temp and Humidity data via GPIO from the DHT22 sensor. Light via Enviro Phat and Moisture via analog input from TE-215 sensor to Enviro Phat analog pin 0. Also draws a circle filled with the colours detected by the …

environment.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# 'SENTREE'
# ----------------
# Uses PiCamera to take a photo with a timestamped filename, 
# then add some text with transparent 'underlays' and a logo. 
# Will get the Temp and Humidity data via GPIO from the DHT22 sensor. 
# Light via Enviro Phat and Moisture via analog input from TE-215 sensor to Enviro Phat analog pin 0.  
# Also draws a circle filled with the colours detected by the Enviro Phat

# Kosso : 19 Aug 2017

import picamera
import datetime as dt
from subprocess import call  
import sys  
from time import sleep
from picamera import PiCamera
import pytz
import Adafruit_DHT
#import RPi.GPIO as GPIO # This is the GPIO library we need to use the GPIO pins on the Raspberry Pi
from envirophat import light
from envirophat import leds
from envirophat import analog

print(analog.read(0))

# Reads analog signal from TE215 connected to Enviro PHAT Analog pin 0. 
# out of water reads : ~3.3
dry = 3.311
# submerged in water reads : ~1.1
wet = 1.1  #submerged

moisture = analog.read(0)

moisture_perc = ((moisture - dry) / (wet - dry)) * 100

print ('moisture percentage between 1.1 and 3.3: {0}'.format(moisture_perc))


#leds.on()
#leds.off()

r, g, b = light.rgb()
light_value = light.light()
print 'LIGHT: ' + str(light_value)

#print light.rgb()
print('RED:{0} GREEN:{1} BLUE:{2}'.format(r, g, b))



sensor = Adafruit_DHT.DHT22
# DHT sensor data is connected to GPIO PIN 4
pin = 4


output_folder = '/home/pi/_SENTREE/_cap/'


humidity = 0
temperature = 0

def get_temp_humidity():
    global humidity, temperature
    print('get_temp_humidity... ')    
    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
    # Note that sometimes you won't get a reading and
    # the results will be null (because Linux can't
    # guarantee the timing of calls to read the sensor).
    # If this happens try again!
    if humidity is not None and temperature is not None:
        print('TEMP: {0:0.1f}°C  HUMIDITY: {1:0.1f}%'.format(temperature, humidity))
    else:
        print('Failed to get reading. Try again!')    

def take_photo():  
    global humidity, temperature, light_value, r, g, b, moisture
    print('take_photo ... ')    

    camera = picamera.PiCamera(resolution=(720, 480), framerate=12)
    # camera = PiCamera()

    camera.vflip = True
    camera.hflip = True
    #camera.brightness = 60
    #camera.contrast = 70

    i = dt.datetime.now(pytz.timezone('Europe/London'))  
    now = i.strftime('%Y%m%d-%H%M%S')  
    the_time = i.strftime('%d/%m/%Y %H:%M:%S')
    the_text = 'SENTREE'
    photo_name = now + '.jpg'  
    # image is 720 x 480 
    camera.capture(output_folder + photo_name)
    print "photo taken"  
    
    photo_path = output_folder + photo_name  
    status = the_text + ' : ' + the_time
    
    header_text = 'PIKOGRO MONITOR 0.1'
    # build the imagemagick command to draw some underlay boxes and draw some text over them.
    # set up the imput file first
    overlay_text_cmd = "/usr/bin/convert "+ output_folder + photo_name
    # draw a transparent white underlay at top
    overlay_text_cmd += " -strokewidth 0 -fill 'rgba( 255, 255, 255, 0.5 )' -draw 'rectangle 0,0 720,36' "
    # add some text at the top, aligned left (north-eastWEST). Position from top right
    overlay_text_cmd += " -gravity north-WEST -fill black -pointsize 18 -annotate +80+12 '" + header_text + "' "
    # add some text at the top, aligned right (north-east). Position from top right
    #overlay_text_cmd += " -gravity north-east -fill black -pointsize 16 -annotate +12+12 '" + header_text + "' "
    # draw a transparent black underlay at bottom
    overlay_text_cmd += " -strokewidth 0 -fill 'rgba( 0, 0, 0, 0.5 )' -draw 'rectangle 0,480 720, 420' "

    if humidity is not None and temperature is not None and moisture is not None:
        status += '\nTEMP : {0:0.1f}°C  HUM : {1:0.1f}%  MOISTNESS : {2:0.1f}'.format(temperature, humidity, moisture_perc)

    # add some text at the bottom, aligned left (south-west). Position from bottom left
    overlay_text_cmd += " -gravity south-west -fill white -pointsize 16 -annotate +12+8 '" + status + "' "

    light_text = 'LIGHTNESS : ' + str(light_value)
    light_text += '\nR : {0} G : {1} B : {2}'.format(r, g, b)
    overlay_text_cmd += " -gravity south-east -fill white -pointsize 16 -annotate +70+10 '" + light_text + "' "

    overlay_text_cmd += " -strokewidth 0 -fill 'rgb( "+str(r)+", "+str(g)+", "+str(b)+" )' -draw 'circle 680,450 680,470' "

    # the output file path (same as input)
    overlay_text_cmd += output_folder + photo_name
    print "setting text: " + status  
    call ([overlay_text_cmd], shell=True)  
    # to add an image ..   
    print "adding logo" # you'll need a file called overlay.png in /home/pi  
    overlay_logo_cmd = '/usr/bin/convert '+ photo_path + ' /home/pi/_SENTREE/pikogro2.png -geometry +10+0 -composite ' + photo_path  
    call ([overlay_logo_cmd], shell=True)  
    print "added logo"  

get_temp_humidity()
take_photo()

#camera.start_recording("test.h264")
#sleep(5)
#camera.stop_recording()