Go to advanced search

by luisa88
Tue Nov 26, 2019 4:51 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

I got it working! I connected as the website suggested, and separated it into 2 batches. So I have connected to pin 4 and pin17.

Thank you everyone who helped!
by luisa88
Mon Nov 25, 2019 2:51 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

I have connected 17 sensors, but it wouldn't power up although I connected it to the 5v, and a resistor connected with 3.3v and data pin as suggested in the diagram above.

Does anyone know why?
by luisa88
Wed Oct 30, 2019 3:33 pm
Forum: Beginners
Topic: How to plot real time multiple one wire temperature sensors and collect data in csv file in python using RPi 3 B+
Replies: 0
Views: 209

How to plot real time multiple one wire temperature sensors and collect data in csv file in python using RPi 3 B+

Hi, I don't know much about python, but I am working on this project where I need to add 30+ one wire temperature sensors to Raspberry Pi 3 B+. So far I have added 5 sensors and connected as the image suggested: http://i.imgur.com/Cqukdmh.jpg I have added label to my sensors using cd ls -1 /sys/bus/...
by luisa88
Tue Oct 29, 2019 9:24 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

The only difference I can see is that the web site is powering the sensors with 3.3V and I suggested using 5V , I only suggested that as you said you had long cable runs. If the sensors were working and now they are not then there are only so many possibilities , 1. Sensor/sensors are cheap / rejec...
by luisa88
Tue Oct 29, 2019 8:21 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

may be this will help with connecting your sensors http://www.reuk.co.uk/wordpress/raspberry-pi/connect-multiple-temperature-sensors-with-raspberry-pi/ Hi pcmanbob, I tried connecting 5 sensors as described in the website you recommended, at first it worked but then it restart itself and I could no...
by luisa88
Tue Oct 15, 2019 3:45 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

Thanks for the post, I have six pieces of ULN2803A chips, will that work? Or I have to get the Dallas DS2482-800 ? For either, would you mind to show me how do I connect it with the one wire sensor and the pi? The ULN2803A driver and the DS2482-800 driver are chips with completely different target ...
by luisa88
Fri Oct 11, 2019 5:01 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

I will try the above solutions once the sensors are delivered!
by luisa88
Fri Oct 11, 2019 5:01 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

Thank you for the detailed diagram, do I only need 4.7k resistor no matter how many sensors I use? One resistor is all you need for each GPIO data pin you use. I wouldn't put more than 10-12 sensors on a single GPIO data pin, but you can use more than one pin. For 32 sensors I would use 3 data pins...
by luisa88
Fri Oct 11, 2019 2:02 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

- If I split the sensors over different gpio pins, how do I activate it on the pi? Or is the same steps as the one I did? What is I use different gpio pin for each sensor? No you can have a number of sensors on each gpio pin but as you have so many by splitting them up you will help reduce the leng...
by luisa88
Fri Oct 11, 2019 1:54 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

You probably shouldn't attempt to switch the sensors on and off. They will be perfectly happy running all the time. Besides, if the sensor is off, you will miss any temperature swings that may have happened. The relay board isn't needed. If you want to run 32 sensors, no problem. The way I would ta...
by luisa88
Thu Oct 10, 2019 9:38 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

If you want to run 32 sensors then you may have to split them over 3 or 4 gpio pins set up as 1-wire interfaces, you may also need to add a separate 3.3v regulated power rail fed from the 5v on the pi. or you could power the sensors from 5v but use 3.3v for the pull up ( will provide diagram if you...
by luisa88
Thu Oct 10, 2019 2:49 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Re: Trouble reading DS18B20 one wire through 16 relay board on RPi

Hi. So first off why are you trying to use relays to switch the DS18B20 sensors ? you can connect a number of sensors to the gpio pin and read each using there unique serial number. you can also set up several gpio pins to act as a 1-wire interface so you could spread your sensors over 2 or more pi...
by luisa88
Wed Oct 09, 2019 3:47 pm
Forum: Beginners
Topic: Trouble reading DS18B20 one wire through 16 relay board on RPi
Replies: 20
Views: 855

Trouble reading DS18B20 one wire through 16 relay board on RPi

Hi, I am a rookie with programming. Currently working on a project where I am planning to collect data using 16 temperature probes DS18B20 one wire connecting to 16 relay board that connect with Raspberry Pi 3 B+. I have 12V adapter powering the relay, both 5V connected to 5V on RPi, and both ground...

Go to advanced search