Help with Tempurature from ds18b20 on oled please?

Daniel Wright

I have a python app to take the temperature reading from a DS18B20 sensor and display it on a 0.96" Oled display. My only problem is I can't for the life of me figure out how to write the code to convert the temp from C. to F. I have the formula, just don't know where to use it. I have tried a few things and they don't work.

I am including my code below. Thanks for any help...

[code]
#!/usr/bin/env python
import os
import glob
import time
from OmegaExpansion import oledExp
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

def read_temp_raw():
f = open(device_file, 'r')
lines = f.readlines()
f.close()
return lines

def read_temp():
lines = read_temp_raw()
while lines[0].strip()[-3:] != 'YES':
time.sleep(0.2)
lines = read_temp_raw()
equals_pos = lines[1].find('t=')
if equals_pos != -1:
temp_string = lines[1][equals_pos+2:]
temp_c = float(temp_string)/ 1000.0

	return temp_c

status = oledExp.driverInit();
status = oledExp.setDisplayMode(0);
status = oledExp.scrollStop();

status = oledExp.write(time.strftime("%Y-%m-%d %X")+ " Temp:"+ str(read_temp())+" C");
[/code]

mark doutre

temp_f = (( temp_c * 9) / 5) + 32
return temp_f

Daniel Wright

I see.... Use that instead of the return temp_c.?.?
Didn't think of that one. I'll give it a shot.
Thanks.