G+_Luke Militello Posted October 9, 2014 Share Posted October 9, 2014 Homebrew Temperature Sensors These make use of the 1-wire system using some DS18S20+PAR sensors and a program called DigiTemp. I originally prototyped these by just wire-wrapping the components inside some RJ12 telephone surface jacks. I then took it a step further and had some PCB's printed up. One can also make use of these on a RasPi or an Ardunio. They draw their power right from the bus as they operate in parasitic mode. I have one run that is about 800 feet. Using a reverse biased termination diode; runs of this length are possible with twisted pair wire. Although, I cannot take credit for anything more than the manufacturing of the sensors as I lifted the DigiTemp program and the circuit design from the web. This might be worthy of a project on the show. It's very simple and cheap to do. Link to comment Share on other sites More sharing options...
G+_Luke Militello Posted October 9, 2014 Author Share Posted October 9, 2014 The RRD Graphs... http://ems.digitalenigma.net/ts/rrd/ Link to comment Share on other sites More sharing options...
G+_John Mink Posted October 14, 2014 Share Posted October 14, 2014 Nice build! The other awesome thing about going RJ12 is that (since you don't use the landline phone anymore, right?) you can spread them throughout your domicile & still have a wired connection! Btw, how much did the PCBs cost to have printed & what quantity? Link to comment Share on other sites More sharing options...
G+_Luke Militello Posted October 14, 2014 Author Share Posted October 14, 2014 John Mink, it never occurred to me about the telco lines in the house. Worth a try! As for the cost, it was $40 for 5. After which the price goes down pretty well for more. The PCBs technically could have been smaller, but once you get down to a certain size, the price stays the same. So yeah, there is wasted space on the PCBs, but the cost wouldn't have been any less for smaller ones.? http://www.sunstonecircuits.com Link to comment Share on other sites More sharing options...
G+_Luke Militello Posted October 14, 2014 Author Share Posted October 14, 2014 Also, I have a new sensor I made that is a hybrid of the slave and termination sensor. It has a jumper on it that allows one to enable it as a terminator, with the reverse biased diode, or as a slave allowing another sensor to be daisy chained. Link to comment Share on other sites More sharing options...
G+_John Mink Posted October 14, 2014 Share Posted October 14, 2014 Luke Militello we call that "extra spacing" for "safety purposes" :p Thanks for the recommendation of that service! Link to comment Share on other sites More sharing options...
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