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Project - A digital temperature collector

As he was installing bathroom accessories and stuff to water the plants in my new house, the plumber took a look at my job and the devices I was creating.

He told me that he had a temperature measuring device, that he could not find, back in 2011
He needed something like a data logger. Easy and light, cheap, with a battery lasting over year or so, that he could install at customers' places in order to have a Log of "what happened" if any problem came up.
Say, a frozen (broken) pipe or other malfunctions in heating, AC and such. He said connectivity wasn't necessary and to log to a SD-card that could be inspected later would be sufficient.

So we discussed the idea, and I made up a simple wired prototype. Later a real PCB was designed and some versions delivered for further testing.
Meanwhile, I discussed this device with other people and some of them thought of more ideas and other use cases, such as those described below.
We stopped as we were searching for the "most suitable" box, maybe a 3D-printed one.

Monitoring of walls and/or bridges was felt like an important issue to many builders, and indeed it seems to be of more importance, considering the collapse of a bridge in Italy last year.



Tech. specs for the digital thermometer

Dimensions
30mm x 80mm x 10mm (new version: 30mm x 40mm x 8mm)

Adhesive
with logo and writing

Features

  • 3 digit display (new version: OLED 128x32)
  • Powered by one CR2032 cell, lasting circa 1 year
  • Temperature measurement from - 20.0 C° to + 100 C°
  • Precision 1%
  • Accuracy 0,1 C°
  • Possibility of logging on SD Card memory
  • Periodic recording at 1 second intervals, but programmable at longer intervals, and lasting over 20 years.
  • Connection to USB port for information download and parameter configuration
  • TXT (Excel) log format
  • End of line alert for above or below threshold temperatures (with programmable threshold)
  • Possibility of sending a message via SMS.
  • Log size: about 100bytes per minute equals to about 150KB per day or 50MB / year.

The device might also for other use cases and scenarios

Winemakers  wineries that must maintain constant temperatures 
Plumbers Frozen heaters or boilers
Personal Care in places inhabited by people at risk (elderly and children)
Environmental Monitoring holiday, meetings, breeding
Hospitals in hospital rooms and offices
Houses inhabited in limited periods of winter when the heating is shut off and needs checking
Outdoor places wells prevailing for geothermal
Museums works of art
Refrigerators cold rooms and pharmaceutical stores that must maintain constant temperatures
Greenhouses daily temperature

 

Did This Help You? If so, I would greatly appreciate it if you commented below and shared on Facebook

Dario Greggio

Dario's Blog - Electronics & Physical Computing

Email: dario.greggio@a1.net

 

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Comments (-)Number of views (1838)

Author: Dario Greggio

Categories: English, Intermediate, Expert, Physical-Computing

Tags: Physical Computing, PCB Design, Making, Electronics

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