Raspberry Pi 3 and the DS18B20 Temp Probe

1

Hi Guys,

We are looking to build the project for the temp probe

using

I am unable to get the ID to return from probe. As per the jpeg below. I have check the Circuit diagram twice.

Any Advice on what next would be great.

Cheers

Morty

[RaspPie1|668x434]
(/uploads/core_electronics/original/1X/713ff0b3a077e285880c9fa4a60248cc24e16ad7.jpg)

2

RaspPie1

3

Hi Morty,

It looks like you’ve done everything right. Could you try and post a picture of your wiring so we can take a look at that? The jpeg you referenced didn’t seem to work.

4

RaspPie1

That is what I get with regard to the probe but no ID returned…

20170816_155240
20170816_155240.jpg2851×2138 1.84 MB

20170816_155228
20170816_155228.jpg2851×2138 2.18 MB

5

Hi Morty,
Do you have a multimeter handy to test out the voltages on the pins?

6

First rule of troubleshooting!

The only concern I have is the 3-pin screw terminals being used with the breadboard - their pins are quite a thick gauge and you might find that pushing them into a breadboard can damage the breadboard or create an intermittent connection fault.

7

Indeed, I would say try putting those wires directly into the breadboard and see if that makes a difference

8

Hi Guys, i removed the 3 pin screw terminal and go the below response. However there is no ID with a 28 - etc and it only responds once. then back to the original. Any Thoughts

RaspPie2
RaspPie2.jpg816×423 134 KB

9

Hi Sam, I have 3.3 Volts were i should. Is that the voltage you wanted me to check

10

Hmm, yeah that doesn’t look like it. Where did you measure 3.3V? Does both the power and data line measure 3.3V?

11

yes i have 3.3v. I have removed the board all together and soldered just the temp circuit. I think the issue is with Raspberrian.

12

what version of Raspberry did the tutorial use when it was built?

13

I was using a pre-pixel version at the time of that tutorial, but that shouldn’t affect anything. Perhaps the last effort would be to try a fresh image of raspbian? If that doesn’t work, shoot us an email and we can go from there.

14

Hi Sam. was the first thing i did. :slight_smile: Thought i might have broke something. There is a lot of chatter regarding this issue. I have added lines to the config.txt file as some of the raspberry forum’s suggest.

dtoverlay=w1-gpi

https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=98407&start=25

15

Hmm, just reply to your order confirmation email and we can go from there.