Questions tagged [ds18b20]

DS18B20 is a digital 1-wire thermometer chip that can be connected to Raspberry Pi GPIO pins.

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1answer
113 views

Pi can't find 5th DS18B20

I am new in raspberry pi. In my research project, I would like to monitor ground temperature at 60 points. My team decided to set a monitoring system using raspberry pi. As a preliminary test, I ...
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1answer
36 views

Can't get multiple DS18B20 to work. What am I doing wrong? [closed]

I am really struggling with this one. I want to attach multiple (5 or so would be nice) DS18B20 sensors (3 meter cable), but I can't get more than two to function. Two will show up in the devices ...
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2answers
316 views

Raspberry Pi B won't recognise DS18B20 sensor

I have wired up my Raspberry Pi (RPI-0007) to the pins as outlined by http://www.modmypi.com/blog/ds18b20-one-wire-digital-temperature-sensor-and-the-raspberry-pi. However, when I change directory to /...
2
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1answer
131 views

Raspberry Pi 3b+ do not detect DS18b20 on 1Wire

Problem: The new raspbian kernel does not detect the DS18b20 sensor over the 1wire bus. This is due to the Device Tree that was added to Kernel 3.18.8 What hardware used: Raspberry Pi 3b+ Kernel: 4....
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5answers
4k views

DS18B20 w1-gpio Device Tree gpiopin NOT = 4

I have a HAT which blocks GPIO4 so I cannot use the default pin for the temperature sensor, but I just cannot get it to work on another pin! I just get lots of 00- instead of 28- in /sys/bus/w1/...
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0answers
45 views

DS18B20 temp sensor works on Pi 3B+ but not Zero W

I have a breadboard prototype working with a cabled (waterproof and regular temp) DS18B20 sensor and a AM2302 sensor on a 3B+. All is well with it recording at a set interval from each sensor. I'd ...
2
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0answers
35 views

DS18B20 reading double after long use

I installed two DS18B20s on a pi almost a year ago. They have worked great until the last couple months. I am doing a bit of a stress test on them and have been polling them every second for almost a ...
1
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1answer
176 views

DS18B20 temperature sensor not found in devices folder

I am trying to setup DS18B20 for Raspberry Pi. I have followed the instructions from Adafruit Lesson 11 updated RBPI kernal to 4.19 setup wiring (see below) with 10k resistor verified signal (yellow ...
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4answers
3k views

DS18b20 sensor disappearing and turning into “00-00..”

I've read so many issues similar to mine, but haven't found any clear answers, hopefully someone will know. I have a DS18b20 installed on pin 4 with a 4.7k resistor, all settings appear to be correct ...
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2answers
999 views

No w1_slave on DS18B20 on Raspberry Pi 3 B+

In any of these cases the red status LED on the sensor lights up. The Sensor DS18B20 is connected to the Raspberry Pi 3 B+ to the 5v on the GPIO pins. Using the 3.3v pin makes the light of the sensor ...
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1answer
207 views

Can the DS18B20 be parasite powered without external pullup?

I have a DS18B20 temperature sensor which I am trying to use in parasite power mode with only two wires (data line and ground) with my Raspberry Pi Zero W. I've connected it to the RPi in the ...
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1answer
198 views

DS18B20 not visible

I can't make visible ds18b20 :/ w1-gpio w1-therm Are running and in /etc/modules Have added to config dtoverlay=w1-gpio,gpiopin=4 I've got some data like 00-580000000000 00-980000000000 00-...
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0answers
31 views

DS18B20 & Pi 3+

I'm not getting a w1_slave, and all I'm getting is 00-xx0000 when the DS18B20 isn't burning my fingertip. I went for green for ground, which is on the top right plug from this perspective. I spliced ...
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1answer
43 views

DS18B20 device not showing

Things I've tried: Replacing the DS18B20 twice (First one was a different brand than the other 2) Using: modprobe -r -a w1 w1-therm modprobe w1 pullup=1 modprobe w1-therm strong_pullup=1 Checking ...
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4answers
9k views

max length of wire w/ 3.3v or other issue

I have a raspberry pi connected to a DS18B20 temperature sensor shown in the diagram below. The one-wire software is installed and I am able to successfully read the temperature from the devices ...
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1answer
44 views

Conflict or some other issue with “usual” ds18b20 vs waterproof version of this sensor

I have 5 normal ds18b20 sensors and one ds18b20 waterproof sensor and YL-10 adapter (with 4k7 resistor) to connect these sensors to Raspberry Pi. Problem is, that when I connect my "usual" sensors to ...
2
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1answer
530 views

DS18b20 address finding

Can anyone help me how to find the address of DS18b20 temp sensor automatically and display the temperature using a simple python code?
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2answers
71 views

Picademy Parts Kit Immersible Temperature Probe Pinout

I have a Picademy parts kit (12 of them, actually) from Newark/Element 14. These kits have an immersible temperature probe that I conjecture is based on a DS18B20. However, there's no documentation. ...
0
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1answer
40 views

Cannot connect 18B20+ to raspberry pi 3

I will try connect 18B20+ termomether to raspberry pi 3. It's how i do that: In /boot/config.txt i add: dtoverlay=w1-gpio After reboot in console, as root, I modprobe w1-gpio modprobe w1-...
2
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1answer
2k views

Usage of python-ow One Wire File System Python Package for reading 1-wire DS18B20 data

I'm currently working on the project with a lot of DS18B20 Digital Thermometer Sensors. For a better performance I decided to use this Raspberry Pi compatible 1-wire master board, which is based on ...
1
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1answer
1k views

How to use DS18B20 in parasite power mode?

The datasheet for the DS18B20 says: To assure that the DS18B20 has sufficient supply current, it is necessary to provide a strong pullup on the 1-Wire bus whenever temperature conversions ...
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0answers
521 views

PI Zero W, Running NodeJS and reading sensors - bad performance [closed]

I am doing a little project for my pet snake and that is a Terrarium controller with my Raspberry PI Zero W. Just for fun I created it using NodeJS since I am a bit familiar with it. A friend of mine ...
3
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1answer
354 views

Does select/multithreading make sense when dealing with multiple DS18B20 and GPIO reads simultaneously?

As you may know, DS18B20 is not the quickest sensor and answers after around 750ms delay but, afaik, 1-wire is a relatively quick bus. I have multiple sensors connected to the board, which means if I ...
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4answers
5k views

What is the maximum number of DS18B20 probes that can attached to one input port?

I initially asked this as an 'answer' to an existing thread on DS18B20 temperature probes as it seemed the obvious way to ask a question of people who were connecting the probes to various hardware. ...
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0answers
156 views

w1thermsensor is not detected

I am using DS18B20 Temperature sensor on Raspberry Pi. For that I installed w1thermsensor library on my Raspberry Pi. My code is given below. import time from w1thermsensor import W1ThermSensor ...
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2answers
334 views

Is it bad for the PowerSwitch Tail 2 to turn on and off frequently?

I am using my Raspberry Pi with a PowerSwitch Tail 2 to control the temperature of homebrewed beer. Whenever the temperature goes above a certain range, the PST2 shuts off, and turns on when the ...
1
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1answer
359 views

DS18b20 w1_slave file stamp doesn't change

So this is going to sound strange, but I don't see the date stamp of w1_slave files change as the contents (and temperature changes). I think it's set as the boot time and doesn't change. Ever pi@...
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2answers
40 views

New to Pi 3 and hardware -Connecting Pi 3 to a sensor

I bought the following items: Raspberri pi 3: Breadboard: Jumper wires: Temperature sensor DS18B20: 4.7k resistors: My question - I never learned electronic or hardware and I'm simply trying to ...
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0answers
50 views

wifi comes up but then disappears when temp sensors connected to GPIO

I have a headless PiZero with a wifi dongle using a RPI PSU (and it's running Domoticz). It boots fine and is all OK until I boot it with my long (20m?) wire of DS18B20s connected. With that plugged ...
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2answers
2k views

DS18B20 Temperature sensor

Currently I can read the temperature reading from a file for both sensor. import os import time os.system('modprobe w1-gpio') os.system('modprobe w1-therm') temp_sensor = '/sys/bus/w1/...
2
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1answer
2k views

I2Cs for temperature senors and multiple PWM outs

EDIT: Rewrite, this is why you don't write questions after not sleeping for two days (wait what day is it?) I have a whole bunch of 12V 4 pin (pwr, grnd, tach, pwm) fans I'd like to manually control, ...
0
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1answer
421 views

How to get full 12-bit resolution of ds18b20 from w1_therm

The ds18b20 reports temperature in sixteenths of a degree; however, the w1_therm driver reports temperature in millidegrees, as a truncated integer. It takes half-millidegrees to accurately represent ...
1
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1answer
990 views

how to set precision of DS18B20 via w1-therm?

According to the documentation for w1-therm: Writing a value between 9 and 12 to the sysfs w1_slave file will change the precision of the sensor for the next readings. This value is in (volatile) ...
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0answers
527 views

Temperature Sensor (DS18B20) doesn't work

I am having trouble getting to run my temperature sensor. If I execute the following script to check if the PIN 7 gives me an output, it returns 1 (as it ought to). import re, os, urllib2 import ...
22
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1answer
24k views

DS18B20 not listed in /sys/bus/w1/devices

I'm starting work on a fermentation monitor using the Adafruit temperature sensing tutorial, a RPi B+ running Raspbian, a 4.7 kOhm resistor and a DS18B20 to which I've soldered male breadboard pins. ...
0
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1answer
2k views

Troubles WebIOPi get values from sensor DS18B20 without modify config file

I have a question, I'm working in a project where are a necessary getting of values from a DS18B20 I had read this posts from WebIOPi forum: https://groups.google.com/forum/#!msg/webiopi/KPOGcDwAODE/...
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1answer
670 views

Raspberry pi 2 B won't detect temp sensor DS18B20

I have a rasp pi 2 b+ and a temperature sensor DS18B20. I can't get my ls /sys/bus/w1/devices command to show anything other than w1_bus_master1. I suspect it is a problem with my set up but I've ...
2
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2answers
4k views

Java and DS18B20

I want to read temperature from DS18B20 sensors. Sensors are connected and works fine. How can I read temperature using Pi4J? Is there API for this?
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0answers
645 views

DS18B20 way too high temperature values

I am using 2 DS18B20 temperature sensors connected to my raspi. They are connected to a 5 meter long cable together with a DHT11 humidity sensor, do they share plus and minus. The problem I have is ...
2
votes
1answer
374 views

Can I pick any other GPIO in my scenario?

I have a setup with a pi 3 and a breadboard. I am using a DS18B20 temperature sensor. This is my setup (notice wrong resistor in this sketch): As far as I can see it the sensor's second pin is the ...
0
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1answer
1k views

w1-gpio (Dallas 1-wire) not working on Raspberry Pi 2 Model B

I am using a setup with three DS18B20 temperature sensors in a 3-wire setup (using a pullup resistor of 4.7 kOhm from data to 5v) on a raspi prototype shield. This works fine with a Raspi model B+ V1....
5
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1answer
3k views

conflicting dtoverlays

I'm using a GPIO connected display 1 which requires a patched kernel and dtoverlay=4dpi-3x in /boot/config.txt I would like to use a DS18B20 temperature sensor which requires dtoverlay=w1-gpio to show ...
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1answer
209 views

Sunfounder DS18B20 disable light

I've got a problem: I have a Sunfounder DS18B20 Module for measuring the Temperature, but this Module has a little Led which i wont to turn off. Is this possible and how? Thanks
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0answers
210 views

Using several sensors at the same time, e.g. 1wire and regular GPIO input

I'm doing my first Raspberry Pi project, in which I want to get input from several sensors at the same time. I bought a DS18B20 temperature sensor, which is 1wire, and am able to get input with the ...
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2answers
898 views

need 1 Wire read / write functions

I would like to send some simple read and write commands to the Pis 1wire port. For example to be able to configure the resolution of the ds1820 Temperature sensor. The kernal modules used to access ...
5
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3answers
7k views

How to change DS18B20 reading resolution?

I've got my 4 Maxim DS18B20 devices up and working using the w1-gpio and w1-therm modules. I would however like to change the temperature resolution by writing to the config register of the devices, ...
2
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1answer
4k views

Change GPIO pin for DS18B20+ One Wire Digital Temperature Sensor

First question on this SE site so please be gentle. Trying to get the above mentioned temp sensor working on the RPi but with a touch screen installed. When I run the following steps nothing ...
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0answers
2k views

DS18B20 shows 00-xx0000

I am using a DS18B20 to measure water temperature for about a year now, but changed the sensor about two weeks ago (for the exact same model). and that was running perfectly fine. Just yersterday it ...
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0answers
108 views

Thermometer no longer working

I am running the below lines to try to load my two therms. sudo modprobe w1-gpio sudo modprobe w1-therm ls /sys/bus/w1/devices All I am getting is 00- instead of 28- I have checked wiring, works ...
3
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1answer
8k views

DS18B20 not detected by Raspberry Pi

I'm trying to have a DS18B20 working with my Raspberry Pi Model B Revision 1.0, and it doesn't work. No matter what I try I still see nothing in /sys/bus/w1/devices/ besides: pi@raspberrypi ~ $ ls /...