Read temperature once

[mada72]

Hi,

Im new to python
I have this code found of youtube, it works fine and print the temperature in a loop (until I do CTRL C)

#!/usr/bin/python

import sys, time, signal, serial, datetime
from socket import *

ser = serial.Serial(
	port='/dev/ttyUSB0',
	baudrate=9600,
	#parity=serial.PARITY_ODD,
	#stopbits=serial.STOPBITS_TWO,
	#bytesize=serial.SEVENBITS
	)
	
ser.isOpen()
	
while True:
		ser.write('T\r')
		time.sleep(1)
		serial_input = ''
		while ser.inWaiting() > 0:
			serial_input += ser.read(1)
		now = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
		print now + ", " + serial_input
		
ser.close()
sys.exit()

But If I want to print it only once and optional also sent it by email?
I have tried this code (just print it once, no email yet):

#!/usr/bin/python

import sys, time, signal, serial, datetime
from socket import *

ser = serial.Serial(
	port='/dev/ttyUSB0',
	baudrate=9600,
	#parity=serial.PARITY_ODD,
	#stopbits=serial.STOPBITS_TWO,
	#bytesize=serial.SEVENBITS
	)
	
ser.isOpen()

ser.write('T\r')
serial_input = ''
serial_input = ser.read(1)
now = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
print now + serial_input		

ser.close()

sys.exit()

But it just print the date and time and a " + " no temp - what am I missing?

/Martin

[Yoriz]

Hi,
You missed out this line while ser.inWaiting() > 0:

#!/usr/bin/python
 
import sys, time, signal, serial, datetime
from socket import *
 
ser = serial.Serial(
    port='/dev/ttyUSB0',
    baudrate=9600,
    #parity=serial.PARITY_ODD,
    #stopbits=serial.STOPBITS_TWO,
    #bytesize=serial.SEVENBITS
    )
     
ser.isOpen()
     
ser.write('T\r')
time.sleep(1)
serial_input = ''
while ser.inWaiting() > 0:
    serial_input += ser.read(1)
now = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
print now + ", " + serial_input
         
ser.close()
sys.exit()

[mada72]

Ah ok thanks!