Raspberry Pi - GPIO & Python (7/9) - Temperature sensor

Getting started with GPIO and Python.

[AlexBurns]

Great advice from Justin Hugill.
I too almost burnt up my temperature sensor... but for me it was following the comments. In my experience if you do it exactly as shown in the video that is the correct way.

[guillaumepetitcollin]

warning ! the closeup on sensor at 3:40 shows wrong polarity !!! pin 1 and 3 are reversed. I almost burn the thing up !

[jb]

A very well orchestrated presentation of Raspberry Pi for beginners like myself.  You are distinct in words used and explanatory on processes taken.  I'm new to this, have a interest, will continue learning about it and have added you to my favourites list.  Thank You!

[Tony-bzmf]

Now fixed. Applied latest Raspian and latest Firmware. Plus changed all wires on board. Seems to have been a number of issues at once!

[justinhugill]

For anyone struggling getting this working. The video wasn't the most helpful.
1) When connecting to the gpio board, this needs connecting to gpio 04.2) if like me you follow the tutorial and when you run ls -l the thermometer isn't showing, the video doesn't help with what to do. The fix for mine on Rpi2 was simple:

Sudo nano /boot/config.txtAdd the following line at the bottom dtoverlay=w1-gpioCtrl X and Y to saveReboot the PiHopefully this will fix as it did with mine.

[chileanexperiment]

Great video, do I need a resistor to run mine??

[pilottk]

Hello,

I am getting started with electronics, can you please explain why you hook up a 3.3V line to the data pin? I see it has a (if I'm not mistaken) 4.7k resistor and I know the GPIO high state is on 3.3V but what kind of sorcery happens behind the scenes? Thanks

[sahilharit]

Can you suggest me, what type of wire/cables should I use to expand the distance of sensors from pi(distance more than 5m) so that it would work efficiently?

[nickycummins]

Hi just wondering how would you get the temp display up on a lcd 16x2, I have lcd connected up and test done but sending temp changes to lcd I cant seem to get.
Thanks

[Kushiwawah]

what if I wanted to put the temperature into coffee to determine what temperature it is to put into raspberry pi? How would I be able to do that?

[CBJemat]

how about weight scale? can i need a lil favor here? thank u

[nickbuckham]

My code keeps displaying the same temperature, "(85, 105)". Any ideas what i'm doing wrong? Thanks :)

[tulionunez]

how can I send the output temperature to an email address??

[rickfalk]

Where in the code does it say that it should read from pin 4? It works, but why ? :D

[ABatorfi]

I love the videos, but with this video, I'm missing which gpio pin you connected the data pin to. Can you tell me which it is?

Anyway, excellent videos!

[jayanthasaranga]

thank you your tutorial, we want to more tutorail, please give up
Reply

[edw]

a pity that every reading apparently has to be written to a file that then should be read as it contributes to card wear.
Don' t understand why the DS18B20 values can' t be read directly into variables. It is possible with the DHTxx series as well and in fact anything that can be put in a file can be put into a variable as well

[winchy]

Is it possible for you to make a quick update video of the temperature sensor controlling a GPIO pin. For example  if temp too hot turn on GPIO 17  else  if temp too low turn off GPIO 17. Many Thanks

[unconsciouslyincompetent]

If devices = 0
Open config file: terminal then 'sudo nano /boot/config.txt'
and add at the bottom of the config file 'dtoverlay=w1-gpio'
Reboot and try again.

[thediltarget]

So if anyone knows.... I am getting this error

device_folder = glob.glob(base_dir + '28*')[0]
IndexError: list index out of range