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by iwiber
Wed May 15, 2019 9:24 am
Forum: Automation, sensing and robotics
Topic: My temp sensor ds18b20 doesn't seems accurate
Replies: 15
Views: 2042

Re: My temp sensor ds18b20 doesn't seems accurate

I have had this happen to me also. Where were the sensors purchased? I have about 30 of these sensors. 10 each were purchased from three different vendors. Two of the vendors were of Chinese origin, and the other was Mouser. After the first order of 10, I realized they were not calibrated because t...
by iwiber
Tue May 14, 2019 10:55 am
Forum: Other projects
Topic: Probe Module for Ds18b20 -- Alternative?
Replies: 4
Views: 481

Re: Probe Module for Ds18b20 -- Alternative?

omegaman477 wrote:
Tue May 14, 2019 7:51 am
Adafruit have an encapsulated, waterproof DS18B20. https://www.adafruit.com/product/381
That's the one I have
by iwiber
Mon May 13, 2019 5:48 pm
Forum: Automation, sensing and robotics
Topic: My temp sensor ds18b20 doesn't seems accurate
Replies: 15
Views: 2042

Re: My temp sensor ds18b20 doesn't seems accurate

Any good ways to verify the real temp with quite good accuracy? I mean, besides a $50000 unit lol Boiling water and ice in distilled water, compensate for your altitude, there are online calculators. But I would bet your only reading the top 9 bits and calculating against that, rather than the full...
by iwiber
Mon May 13, 2019 1:22 pm
Forum: Automation, sensing and robotics
Topic: My temp sensor ds18b20 doesn't seems accurate
Replies: 15
Views: 2042

Re: My temp sensor ds18b20 doesn't seems accurate

Any good ways to verify the real temp with quite good accuracy? I mean, besides a $50000 unit lol
by iwiber
Mon May 13, 2019 1:06 pm
Forum: Automation, sensing and robotics
Topic: My temp sensor ds18b20 doesn't seems accurate
Replies: 15
Views: 2042

Re: My temp sensor ds18b20 doesn't seems accurate

Hi guys,

In C:

DS18B20 = 11.6
Pool T. = 14.4

For the chiller I can't say, should be between 12.8-13.2
by iwiber
Mon May 13, 2019 12:11 pm
Forum: Automation, sensing and robotics
Topic: My temp sensor ds18b20 doesn't seems accurate
Replies: 15
Views: 2042

My temp sensor ds18b20 doesn't seems accurate

Hi guys, My ds18b20 is off (lower) by 3 to 5 °F randomly and I'm not sure what to test anymore. I put together a new one, same results. I followed this plan, with the exact same resistance. http://www.reuk.co.uk/wordpress/wp-content/uploads/2013/06/raspberry-pi-ds18b20-connections.jpg I assume it's ...
by iwiber
Tue May 07, 2019 9:27 am
Forum: Other projects
Topic: Probe Module for Ds18b20 -- Alternative?
Replies: 4
Views: 481

Re: Probe Module for Ds18b20 -- Alternative?

Awesome thanks!
by iwiber
Tue May 07, 2019 12:31 am
Forum: Other projects
Topic: Probe Module for Ds18b20 -- Alternative?
Replies: 4
Views: 481

Probe Module for Ds18b20 -- Alternative?

Hello,

I'm not very electronic savvy.. is there something else than this that I could use since it's super hard to find? Like welding resistances or something else?

Your help would be much appreciated.
by iwiber
Thu May 02, 2019 1:49 pm
Forum: Other projects
Topic: Automate water heater - Temp sensor/110v relay/switch
Replies: 10
Views: 1282

Automate water heater - Temp sensor/110v relay/switch

Hi guys, I'm quite familiar with computer/linux etc but didn't even know about Raspberry PI until someone tells me I could probably do what I want with it. Here's what I'd like to do, can you please advise on what you'd use? I basically need to read the temp of a water tank, and create a condition t...

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