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1answer
191 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....
1
vote
1answer
2k 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 ...
1
vote
3answers
691 views

1-Wire Button or switch?

For an application I am currently developing, I need to be able to get the status of a button (pressed or not pressed) or a switch (which can be considered a button in some way). While I could ...
1
vote
2answers
1k views

w1-gpio and DS18B12 always return t=85000

I am having a DS18B20 temperature sensor in a 3-wire setup (using a pullup resistor of 4.7 kOhm from data to 3.3v) on a Raspberry Pi model B+. It always return the value as shown below when using cat ...
1
vote
2answers
931 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 ...
1
vote
0answers
212 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 ...
1
vote
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 ...
2
votes
1answer
917 views

w1-gpio issue with Waveshare 5" LCD touchscreen and Pi 2

I've got huge trouble solving the following problem: I attached a Waveshare 5" LCD touchscreen to a Pi 2 Model B (components and setup listed below), prepared a new SDcard with Raspbian Jessie (not ...
1
vote
0answers
216 views

My Pi2 doesn't cognize One-Wire

I'm using Raspberry Pi 2 with Gentoo. I tried to use Digital Thermometer(DS18B20) with 1-wire so I prepared: login as: qwpo1030 Using keyboard-interactive authentication. Password: qwpo1030@rpi2-...
6
votes
3answers
6k views

What is a failproof method for testing a GPIO pin?

So, basically, I've been trying to get my raspberry pi to get the room temperature from a DS18B20 1-wire temperature sensor. I've read only GPIO 4 is capable of this, and I think for some reason GPIO ...
7
votes
2answers
3k views

How to change the Pin used for the 1-wire Bus

By default the header Pin Nr. 7 us used by the 1-wire kernel module. I would like to change it to a one of the 4 new GPIO Pins of an Rev 2 Pi.