Dear Sara,

that’s very kind, but unfortunately it is useless regarding the reusability of the code. This will need a proper Open Source license, unless then it is always under your copyright.

Regards
niles

Hi.
You can use our code in your projects.
You just need to add a reference to this tutorial.
Regards,
Sara

I would like to use and adapt the code. However, since the result is supposed to be Open Source (probably MIT license, like adafruit, or similar permissive) it would be great to have your snippet Open Source as well.

Currently it is lacking a license and thereby is under copyright, which may not be used without your permission and will always be under restrictions.
Regards
niles

Thanks for sharing this info.
Regards,
Sara

ended up here following the comments of one of my students. Great work, I especially like the description of the hardware setup.

I think the code has a possible pitfall: when the RPi has seen two sensors of the same family, this code might return the the data of a sensor that has been removed (e.g. replaced due to damage). This is not a scenario where two sensor are on the bus, but a maintenance scenario when only one sensor is deployed.

Furthermore, for people who are just interested in getting things done, pypi.org/project/w1thermsensor/ might be a better starting point.

I haven’t had a issue since I replaced the 4.7k ohm pull with a 2.2k I am powering my 1-wire buss with 3.3v and not parasitic.

Did you ever figure this one out? I have the one sensor setup working fine, but would like to have 2 sensors (two aquariums).

Hi.
Yes. I tried, but I get better results with “normal” mode.
You can try both ways and see which one works best for your scenario.
Regards,
Sara

#!/usr/bin/python3
import os
import glob
import time
base_dir = ‘/sys/bus/w1/devices/’

os.system(‘modprobe w1-gpio’)
os.system(‘modprobe w1-therm’)

device_folder = glob.glob(base_dir + ’28‘)
NumDev=(len(glob.glob(base_dir + ’28‘)))
#values=range(NumDev)

def read_temp_raw(device):
f = open(device, ‘r’)
lines = f.readlines()
f.close()
return lines

def read_temp(device):
global temp_c
lines = read_temp_raw(device)
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
temp_f = temp_c * 9.0 / 5.0 + 32.0
return temp_c, temp_f

#list comprehension
device_file = [x + ‘/w1_slave’ for x in device_folder]\

print(‘Found ‘,NumDev,’Sensors’)

for a in device_file:
print(read_temp(a))

#print(read_temp(device))