[split] Check presence of a file

[pascale]

Snippsat,
Thank you so much, it works

#! bash/bin/python3  
def read_sensor(sensorID):  
    tempfile = open("/sys/bus/w1/devices/"+ sensorID +"/w1_slave")
    thetext = tempfile.read()
    tempfile.close()
    tempdata = thetext.split("\n") [1].split(" ")[9]
    temperature = float(tempdata[2:])
    temp_sensor = temperature / 1000
    return (temp_sensor)

And:

from mySensorModule import read_sensor
from mySensors import sensorsID
import time

# accessing a dictionary: dict_name[key] = value
sID1 = sensorsID['solar_panel']
sID2 = sensorsID['cyl_bottom']
x = 5
while 1:
    read_sensor(sID1) + x > read_sensor(sID2)
    print("it's Hot!")
    time.sleep(1)
else:
    print("Got it wrong again Dad")

prints "it's hot"
Thank you!!
I can see why you are administrator
The next step is GPIO
REGARDS
Paul

[gontajones]

from mySensorModule import read_sensor
from mySensors import sensorsID
import time
 
# accessing a dictionary: dict_name[key] = value
sID1 = sensorsID['solar_panel']
sID2 = sensorsID['cyl_bottom']
x = 5
while True:
    if read_sensor(sID1) + x > read_sensor(sID2):
        print("it's Hot!")
    else:
        print("Got it wrong again Dad")
    time.sleep(1)

[pascale]

Thanks gontajones
Your code works a treat!!!
I am now adding the RPi.GPIO code, I have resolved the code errors for the moment but the pump is not comming on, and the light has gone out on the relay?
Here is the new code

from mySensorModule import read_sensor
from mySensors import sensorsID
import time
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(25,GPIO.OUT)
# accessing a dictionary: dict_name[key] = value
sID1 = sensorsID['solar_panel']
sID2 = sensorsID['cyl_bottom']
x = 5
try:
    while True:
        read_sensor(sID1) + x > read_sensor(sID2)
        GPIO.output(25,GPIO.HIGH)
        print("it's Hot!")
        time.sleep(1)
    else:
        print("Got it wrong again Dad")
        GPIO.output(25,GPIO.LOW)
   
except KeyboardInterrupt:
    GPIO.cleanup()

I have less understanding of GPIO than pyhon!
Not to sure if I should start another thread as this is a raspi GPIO problem now. Thanks to you guys I am beginning to understand this
Kind regards
Paul

[gontajones]

from mySensorModule import read_sensor
from mySensors import sensorsID
import time
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(25, GPIO.OUT)
# accessing a dictionary: dict_name[key] = value
sID1 = sensorsID['solar_panel']
sID2 = sensorsID['cyl_bottom']
x = 5
try:
    while True:
        # Here you have to use the IF-ELSE
        if read_sensor(sID1) + x > read_sensor(sID2):
            GPIO.output(25, GPIO.HIGH)
            print("it's Hot!")
        else:
            print("Got it wrong again Dad")
            GPIO.output(25, GPIO.LOW)
        time.sleep(1)

except KeyboardInterrupt:
    GPIO.cleanup()

[pascale]

Hi gontajones
Thanks for looking at my script, I will change mine and test tommorrow (wife home now)
I am trying to find out if it is best to use pythons RPi.GPIO or wiringpi?
Thank you all again for your kind imput
Regards
Paul

[gontajones]

Both modules are very good.
But I've been using RPi.GPIO.

[pascale]

Hi gontajones
evening here the temperatures have changed my unmodified script still gives "its hot", once modified, it returns the correct reply, but obviously the pump wont start, so I am not sure if the script is working the GPIO's. when I last looked the red light for the relay had gone out, indicating 0 volts I think.
I want this script to check and compare the temperatures at regular intervals, when the first condition is meet I want it to turn on the relay, leaving the relay on until the condition is no longer meet.
Not really understanding this yet, is that what this code does?
Kind regards
Paul

[gontajones]

Not really understanding this yet, is that what this code does?

Yes!
Are you sure that your relay is powered and it activates with HIGH state (some cases it activates with LOW)?

[pascale]

Hi gontajones
The relay is an eight module 12 volt type, at the moment I am trying to use only one module, the technical description states each module uses 1.5v, I have all 8 modules connected, each is lit up, I have a 240volt lamp attached for the moment to see if the code operates the relay. to the output ports of the relay I have connected the live to the center, and the live out to the right side, (the neutrals are joined seperately)relay setup like in this tutorial, I understand that to use all eight relays I will have to use an external power source. Before the code the small red light on the module was on but dim, I activated the code, the the small red light on the module went bright for a second or so and then went out completely. When I

gpio readall

in terminal it indicated that all gpio were 1 except "25" which was 0.
I added the "its hot" and "dad got it wrong again" to see if the code worked and the time of sleep otherwise it printed "its hot" non stop until I pressed Ctrl+C !!!
I am now going to remove these parts and see what happens
Kind regards
Paul

ps I have just commented out these parts for now rather than remove them

[gontajones]

pascale, please post your entire code (every file) to let us help you.
Maybe you read)sensor() is not returning what you're expecting.