harbarwurz
New Member
Hello
I have a strange problem:
On my Raspberry Pi 4 I have a Humi/temp sensor "DHT 22" (working) and a RF 433 Mhz transmitter to switch a heating mat based on the measured temperatures.
Measuring and sending from the IDE (Thonny) or the shell works fine. (messurement and then heat ON or OFF)
So I created the script as a crontab:
Inside the python script i write a logfile to see if the script is working:
The script writes the logfile every Minute, but it wont switch the heatmap.
IF i run the script from Thonny, the script switches the Power adapters. In bash too, but not when just running as cronjob
The command to send the code is "send 11111 1 1", the script "send" is in $PATH:
and works directly in shell, no matter from where i call it:
The python script is owned by user "pi" (and the same group) and is chmod +x, like i wrote before it works perfektly when running
in Thonny or Bash directly.
This is my Python script, sure it could be wrote better, but im a newbie in Python
SYSLOG:
Do you have an Idea what the problem could be ? I had it running perfectly before, but then someone spilled a drink on my raspberry and i had to start over with a new raspy and the code from the backup and i can't get the code to work this time. Please help me !!
I have a strange problem:
On my Raspberry Pi 4 I have a Humi/temp sensor "DHT 22" (working) and a RF 433 Mhz transmitter to switch a heating mat based on the measured temperatures.
Measuring and sending from the IDE (Thonny) or the shell works fine. (messurement and then heat ON or OFF)
So I created the script as a crontab:
Code:
* * * * * /usr/bin/python3 /home/pi/script.pyInside the python script i write a logfile to see if the script is working:
Python:
f = open("out.txt", "w")
f.write(tnow)
f.write('\n')
f.write(f'Temperatur: {temperature:0.1f}C\n')
f.write(f'Feuchtigkeit: {humidity:0.1f}%')
f.close()The script writes the logfile every Minute, but it wont switch the heatmap.
IF i run the script from Thonny, the script switches the Power adapters. In bash too, but not when just running as cronjob
The command to send the code is "send 11111 1 1", the script "send" is in $PATH:
and works directly in shell, no matter from where i call it:
The python script is owned by user "pi" (and the same group) and is chmod +x, like i wrote before it works perfektly when running
in Thonny or Bash directly.
This is my Python script, sure it could be wrote better, but im a newbie in Python
Python:
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import os
import Adafruit_DHT
import time
import subprocess
humidity, temperature = Adafruit_DHT.read_retry(Adafruit_DHT.DHT22, 14)
tnow = time.strftime('%H:%M')
f = open("out.txt", "w")
f.write(tnow)
f.write('\n')
f.write(f'Temperatur: {temperature:0.1f}C\n')
f.write(f'Feuchtigkeit: {humidity:0.1f}%')
f.close()
#Temperature output bash
print(tnow, '\n')
print(f'Temperatur: {temperature:0.1f}C')
print(f'Feuchtigkeit: {humidity:0.1f}%')
#Temperatur Function
#heater on
if (temperature <= 23):
FNULL = open(os.devnull, 'w')
retcode = subprocess.call(['send 11111 1 1'], stdout=FNULL, stderr=subprocess.STDOUT, shell=True)
#heater off
elif (temperature >= 25):
FNULL = open(os.devnull, 'w')
retcode = subprocess.call(['send 11111 1 0'], stdout=FNULL, stderr=subprocess.STDOUT, shell=True)SYSLOG:
Do you have an Idea what the problem could be ? I had it running perfectly before, but then someone spilled a drink on my raspberry and i had to start over with a new raspy and the code from the backup and i can't get the code to work this time. Please help me !!
Last edited:
