hardware hack Thermostat with orange Pi zero .

FRANK333 · May 12, 2019

I'm going to use an orange Pi zero to make a thermostat adjustable via lan; do you know how to point me to some easy to apply project?
I tried several projects, with ds1820b sensors and relais card for raspberry, but I have problems for example with the libraries RPi.GPIO because they do not match those OPi.GPIO.

I can currently turn the relays on and off with an android app or via terminal command.

martinayotte · May 12, 2019

46 minutes ago, FRANK333 said:

but I have problems for example with the libraries RPi.GPIO because they do not match those OPi.GPIO.

Provide details about errors/discrepancies you found between those 2 libs.

FRANK333 · May 12, 2019

hello martin , let me explain myself better , using this tutorial ( thank you the author ) http://davetsao.com/blog/2015-07-11-raspberry-pi-thermostat.html
there is this command import RPi.GPIO as GPIO , which I replaced with OPi.GPIO (of course I loaded the libraries Opi) it seems that the commands setmode setup mode are not recognized

martinayotte · May 12, 2019

6 minutes ago, FRANK333 said:

let me explain myself better

I'm using this GPIO python library instead, much more easier to use : https://github.com/duxingkei33/orangepi_PC_gpio_pyH3

In the thermostat code, simply comment out the setmode/setup lines, it should be easy to translate the rest of the code.

FRANK333 · May 12, 2019

All right, now I do a clean installation and I start again, then I let you know. but I had decommented a few lines but the software did not start.Do you have any simple project to start from?

martinayotte · May 12, 2019

10 minutes ago, FRANK333 said:

Do you have any simple project to start from?

What do you mean ? Simple project to test this GPIO library ? Simple blinking LED on PA10 for example :

#!/usr/bin/python

import sys, time
from pyA20.gpio import gpio
from pyA20.gpio import port

gpio.init()

gpio.setcfg(port.PA10, gpio.OUTPUT)

while True:
	gpio.output(port.PA10, gpio.LOW)
	time.sleep(0.25)
	gpio.output(port.PA10, gpio.HIGH)
	time.sleep(0.25)

FRANK333 · May 12, 2019

I'm looking for a software that through a web page (or an android app) makes the Opi 0 work as a thermostat or at least a software sketch. As for the test program I'll try, but that library is for A20 I have an H2 will work ?

martinayotte · May 12, 2019

11 minutes ago, FRANK333 said:

but that library is for A20 I have an H2 will work ?

The link I've provided is a port of the pyA20 library to H3, and H2 is equivalent to H3.

12 minutes ago, FRANK333 said:

I'm looking for a software that through a web page

There is the HTTPServer library part of standard python, but you will have to learn a lot about it. I'm using it to produce Web interfaces.

FRANK333 · May 19, 2019

Martin, I installed the library and your test works. When I try to insert an if else line, the script doesn't work.

Spoiler

#!/usr/bin/env python

import os
import sys
if not os.getegid() == 0:
sys.exit('Script must be run as root')

from time import sleep
from pyA20.gpio import gpio
from pyA20.gpio import port
from pyA20.gpio import connector

REL = port.PA0
maxTemp = 22

gpio.init()
gpio.setcfg(REL, gpio.OUTPUT)

while 1:
   #open the file for the sensor and read contents
   tempfile = open("/sys/bus/w1/devices/28-8000001f9605/w1_slave")
   thetext = tempfile.read()
   tempfile.close()
   #get the temperature
   tempdata = thetext.split("\n")[1].split(" ")[9]
   temperature = float(tempdata[2:])
   temperature = temperature / 1000
   #print out the temperature
   print temperature
   #switch the relays if temperature above maxTemp

while True:
if temperature > maxTemp:
gpio.output(REL, 0)

else:
gpio.output(REL, 1)

What's wrong? I don't know anything about Python ,I'm sorry.

martinayotte · May 19, 2019

1 hour ago, FRANK333 said:

What's wrong? I don't know anything about Python ,I'm sorry.

Indentation of line of code is important in Python !

Seeing your code above, the second "while" is not indented, so it never been executed since outside of the first one.

Lets rewrite your code here without second "while", since it is useless, but adding a delay of 30 seconds :

bad spoiler ...

#!/usr/bin/env python

import os
import sys
if not os.getegid() == 0:
sys.exit('Script must be run as root')

from time import sleep
from pyA20.gpio import gpio
from pyA20.gpio import port
from pyA20.gpio import connector

REL = port.PA0
maxTemp = 22

gpio.init()
gpio.setcfg(REL, gpio.OUTPUT)

while 1:
   #open the file for the sensor and read contents
   tempfile = open("/sys/bus/w1/devices/28-8000001f9605/w1_slave")
   thetext = tempfile.read()
   tempfile.close()
   #get the temperature
   tempdata = thetext.split("\n")[1].split(" ")[9]
   temperature = float(tempdata[2:])
   temperature = temperature / 1000
   #print out the temperature
   print temperature
   #switch the relays if temperature above maxTemp

if temperature > maxTemp:
gpio.output(REL, 0)

else:
gpio.output(REL, 1)

sleep(30)

[/spoiler]

I've not tested it, but it should now work ...

FRANK333 · May 19, 2019

here is the error it returns, it seems that I can't find the variable maxTemp, and yet I defined it with maxTemp = 22

root@orangepizero:~# python test.py
File "test.py", line 32
if temperature > maxTemp:
^
IndentationError: unindent does not match any outer indentation level
root@orangepizero:~# python -m tabnanny test.py
'test.py': Indentation Error: unindent does not match any outer indentation level (<tokenize>, line 32)
root@orangepizero:~#

NicoD · May 19, 2019

if temperature > maxTemp:

~~Remove that colon~~
Not that. I don't know python. I've got no idea.
My programming must have a semicolon on the end. I can't get used to seeing Python,

martinayotte · May 20, 2019

14 hours ago, FRANK333 said:

IndentationError: unindent does not match any outer indentation level

That is what I said earlier, indentation is critical ...

Did you take back my version ? It doesn't seems to, because the "if" in my version is located at line 29 ...

FRANK333 · May 20, 2019

Okay Martin I solved was just a tabulation problem as I could tell from your example. Now the rudimentary thermostat works, I would like to make sure that it remains in operation as a daemon, insert different temperatures at different times of the day, and finally make a decent GUI. But the road is uphill....

Spoiler

#!/usr/bin/env python
import os
import sys
if not os.getegid() == 0:
sys.exit('Script must be run as root')

from time import sleep
from pyA20.gpio import gpio
from pyA20.gpio import port
from pyA20.gpio import connector

REL = port.PA0
maxTemp = 22

gpio.init()
gpio.setcfg(REL, gpio.OUTPUT)
#gpio.output(REL, 1)
while 1:
   #open the file for the sensor and read contents
   tempfile = open("/sys/bus/w1/devices/28-8000001f9605/w1_slave")
   thetext = tempfile.read()
   tempfile.close()
   #get the temperature
   tempdata = thetext.split("\n")[1].split(" ")[9]
   temperature = float(tempdata[2:])
   temperature = temperature / 1000
   #print out the temperature
   print temperature
   #switch the relays if temperature above maxTemp
   if temperature > maxTemp:
           gpio.output(REL, 0)
   else:
           gpio.output(REL, 1)
sleep(1)

martinayotte · May 20, 2019

32 minutes ago, FRANK333 said:

sleep(1)

This sleep(1) isn't indented properly, so not part of the while loop ...

FRANK333 · May 20, 2019

ok I corrected and added the lines to make the script a daemon, I noticed however that if I kill the script (kill 1234) or if I block the OPI0 the relays card remains in the last state in which it is, how could you do to reset it to off?

Spoiler

#!/usr/bin/env python
import os
import sys
if not os.getegid() == 0:
sys.exit('Script must be run as root')

from time import sleep
from daemonize import Daemonize
from pyA20.gpio import gpio
from pyA20.gpio import port
from pyA20.gpio import connector

REL = port.PA0
maxTemp = 22

gpio.init()
gpio.setcfg(REL, gpio.OUTPUT)

pid = "/tmp/test.pid"

def main():
   while 1:
       #open the file for the sensor and read contents
       tempfile = open("/sys/bus/w1/devices/28-8000001f9605/w1_slave")
       thetext = tempfile.read()
       tempfile.close()
   #get the temperature
       tempdata = thetext.split("\n")[1].split(" ")[9]
       temperature = float(tempdata[2:])
       temperature = temperature / 1000
   #print out the temperature
       print temperature
   #switch the relays if temperature above maxTemp
       if temperature > maxTemp:
               gpio.output(REL, 0)
       else:
               gpio.output(REL, 1)
       sleep(1)

daemon = Daemonize(app="test_app", pid=pid, action=main)
daemon.start()

martinayotte · May 20, 2019

48 minutes ago, FRANK333 said:

how could you do to reset it to off?

Although I didn't try it out, you will need some signal handler where you can turn off GPIO before "kill" been completed.

Here is some example : https://nattster.wordpress.com/2013/06/05/catch-kill-signal-in-python/

FRANK333 · May 20, 2019

I tried to add at the end of the script, these 4 lines :

def signal_term_handler(signal, frame):

print 'got SIGTERM'

sys.exit(0)

signal.signal(signal.SIGTERM, signal_term_handler)

but the relays maintain the status, even after the kill command.

martinayotte · May 20, 2019

5 minutes ago, FRANK333 said:

but the relays maintain the status, even after the kill command.

While doing the kill, did you got the "got SIGTERM" ?

If yes, you should add "gpio.output(REL, 0)" just after the print and before the "sys.exit(0)" ...

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hardware hack Thermostat with orange Pi zero .

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