#import dependencies
#!/usr/bin/python
import serial
import time
import datetime
import os
import RPi.GPIO as GPIO
#functions for relay
GPIO.setmode(GPIO.BCM) #initilize gpio to bcm number system
PWR = 17 #Set input pin
GPIO.setwarnings(False) #turn warnings off
GPIO.setup(PWR,GPIO.OUT) #initiate output mode
GPIO.output(PWR,False) #turn off at start
ser = serial.Serial("/dev/serial0")
ser.write("M 4\r\n") # set display mode to show only CO2
ser.write("K 1\r\n") # set operating mode
ser.flushInput()
time.sleep(1)
i=0
def runTime():
#time in seconds
x = 300
return x
def co2ppm():
#value of ppm to set
y = 1100
return y
def readSerial():
ser.flushInput()
ser.write("Z\r\n")
resp = ser.read(10)
resp = resp[:8]
multiplier = 10
try:
z = float(resp[2:])
except:
print("Error fltCo2 Is invalid")
z = 0
return z*multiplier
def checkStatus():
print("Checking status.")
if (GPIO.input(PWR) == True):
relayStatus = True
print("Relay status:",relayStatus)
else:
relayStatus = False
print("Relay status:",relayStatus)
return relayStatus
def dispenseGas():
print("Dispensing Gas")
relayStatus = checkStatus()
#Check status
if(relayStatus==True):
#Shut off if already active
stopRelay()
else:
#Dispense gas for X seconds
GPIO.output(PWR,True)
print("dispensing")
relayStatus = checkStatus()
timeAmmount = runTime() #seconds to activate
for t in xrange(timeAmmount,0,-1):
fltCo2 = readSerial()
print(str(t),"CO2 PPM = ", fltCo2,"Running")
time.sleep(1)
#Shut off
stopRelay()
def outputDateTime():
#Calculate day of week and time
print("Printing day and time info")
if (day==1):
strWeek = "Monday"
print(day,":",hour,":",minute,":",second, strWeek)
elif (day == 2):
strWeek = "Tuesday"
print(day,":",hour,":",minute,":",second, strWeek)
elif (day == 3):
strWeek = "Wednesday"
print(day,":",hour,":",minute,":",second, strWeek)
elif (day == 4):
strWeek = "Thursday"
print(day,":",hour,":",minute,":",second, strWeek)
elif (day == 5):
strWeek = "Friday"
print(day,":",hour,":",minute,":",second, strWeek)
elif (day == 6):
strWeek = "Saturday"
print(day,":",hour,":",minute,":",second, strWeek)
elif (day == 7):
strWeek = "Sunday"
print(day,":",hour,":",minute,":",second, strWeek)
return strWeek
def stopRelay():
print("Stopping Relay")
#Stop RPi Power and error check
GPIO.output(PWR,False)
relayStatus = checkStatus()
if(relayStatus==True):
print("Cannot dispense, turning off")
GPIO.output(PWR,False)
while (relayStatus == True):
GPIO.output(PWR,False)
if(relayStatus==True):
#Shutdown Pi On critical Error
print("Critical error. Performed emergency Quit safety feature")
os.system("sudo shutdown - r now")
###############
#Call functions
print("Calling functions")
fltLast = 0
first = True
while True:
if first==True:
stopRelay()
time.sleep(1)
fltCo2 = readSerial() #Buffer first result
#Create date/time variables
day = datetime.datetime.today().weekday() #as int
hour = datetime.datetime.now().hour
minute = datetime.datetime.now().minute
second = datetime.datetime.now().second
#store variables for when script is first started
timeStartedHr = hour
timeStartedMn = minute
print("Hour:",hour,"Minute:",minute)
first = False
else:
#Create date/time variables
day = datetime.datetime.today().weekday() #day as int
hour = datetime.datetime.now().hour
minute = datetime.datetime.now().minute
second = datetime.datetime.now().second
time.sleep(1)
i = i+1 #Value for seconds elapsed
fltCo2 = readSerial()
co2Ammount = co2ppm()
#Check co2 vs last and output if changed
if fltLast != fltCo2:
fltLast = fltCo2
print(i,":", "CO2 PPM = ", fltCo2)
#Compare co2 to threshold
if ((fltCo2 < co2Ammount) & (fltCo2 != 0)):
status = checkStatus()
dispenseGas()
stopRelay()
status = checkStatus()
#Check error
elif (fltCo2 == 0):
print("could not dispense")
time.sleep(1)
however I’d love to see some of the codes you guys are running
