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SEGmeter Temperature Kit

published, Nov 22, 2010 4:52am
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We all like to know the temperature.  As a weather junkie myself, I like to check the forecast, outside and indoor temperature as part of the daily routine.  As an urban cyclist, this is an important deciding factor in going for shorts or jeans.

created on: 11/22/10SEGmeter can also take the temperature, so open up and say ahhh.

Get your SEGmeter Temperature Kit at the SEGshop by following this link

Apart from picking what clothes to wear, knowing the temperature also tells other things, like how much heating or cooling is needed, and it's an important feedback to implement control (coming in SEGland). This will allow SEGmeter to turn your Air Conditioner off, or on or even heaters using it's Relay add on circuit.

Ready, set check!

That all the bits, bobs and gubbins are there in your kit. You should have:

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  • one DS18B20 Digital temperature sensor
  • one 3 pin male header
  • one 4.7 kOhm resistor


For this build, there are some parts not supplied in the kit, such as heat shrink and wire.  Fee free to substitute your own magic, materials or other to achieve your desired results.  Laughing

If any of this stuff is missing from your kit, let us know!

Let's get ripping?

This is a really simple build. All we need to do is connect a wire to the pins of the temperature sensor, and run this to the SEGmeter board where we install the three pin header and 4.7 kOhm resistor.

One very important thing is which pin is which.  This diagram sets the record straight!

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it's important to always be positive

Clip those leggies.  I find that out of the packet they are a little long for my taste.  This is easily solved with a pair of side cutters.  I choose to make them half their normal length.  I do this because this way, it makes it easier to slip the heat shrink over the wire connections.

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even electronic components need a haircut, sometimes.

Then with the leggies prepared, it's time to tin them with some solder.  This makes the connection to the wire leads much easier.  Try and get a decent little gob of solder on the legs for the most satisfying result.

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unlike others, these legs were not made for walking...

When it getting hot in here (like it is now, 32 degrees in the ToyShop...) it's time to take some clothes off.  So strip those wires to make them more cool.

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off to the strippers, the wire strippers.

Now, make it joined.  Link up the various wires based on the positive plan above and make them secure with the solders.

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nice and neat from left to right negative, signal and positive

When secure, a little fire applied to the heat shrink convinces the little bits of rubber to go all tight.

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...perhaps just a little "overdone"

When the heat has shrunk, a little hot glue helps with the next step, to make that pro temperature sensor

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when it's hot, it's sticky.

Before the hot glue has gone cool, slide up the un shrunk heat shrink tube flush with the base of the temperature sensor like so:

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this isn't toothpaste, and it's still hot!

Then quickly hit it with some heat, and the shrink will transition into it's shrunk state, ready for the trimming.

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while the oooze is there, it's now ready for the trimming.

With a sharp exacto knife, fingers or other suitable instrument, cut the now cooling hot melt glue to make the end of the temperature sensor "pro"

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trim it neat, trim it close and the temperature sensor will become "pro"

Working backwards, we need to now connect the temperature sensor to the SEGmeter.  We do a similar pro connection here too, with a bit of heat shrink and some hot melted glue.

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Then with the shrink, shrunk smeare about some hot melted glue to prevent the soldered connections from breaking loose and causing unwanted fails.

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it could survive judgement day?

And now, all that cable shenanigans done, it's time to go and pimp out the SEGmeter.  This is a cinch, adding two little components and it's all done.

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some of these are feeling a little empty

Then poke through the components. I find Blue Tak to be kinda helpful from time to time.

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in place, and ready

With all that done, it's now time to go and install the temperature sensor somewhere you'd like to sense the temperature.  I already run an outside one, one in the ToyShop, this one is going into my living room.  I put it here, next to Ivan.

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Crazy Ivan will be watching the temperature now.

And that's it!  All that's needed is to hook it up to your SEGmeter, which should have the temperatureSensorHandler() running, and set up a strem for temperature and bingo!





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Hi Sam,

This post shows how to connect only one temp. sensor.

I need to monitor temp. on 3 floors, can it be done with new SEGmeter v2, and how? Thank you


Some imagination needs to get to work with the wiring bus to the various sensors on eachnfloor.  They all need to share the same signal wire. ;).

The code in the SEGmeter supports multiple Dallas DS18b20 sensors, them its just a matter work outing out which is which, he awarding one up at a tim e with the fingers and watching the data output.

both the V1 and V2.x support the same protocols etc.

Sam, @samotage

The v2.5 segmeter board doesn't appear to have a designated/marked location for installing the 4.7k Ohm resistor for use with multiple sensors.

Can you point me in the right direction for where this should be installed?

Hey Andrew, 

It is indeed installed, check out this photo:


You may or may not need an additional 4.7k resistor in parallel, test first and see.

Good luck!

Sam, @samotage


It took me forever to get to this but I finally had someone replace the 4.7k resistor with a 2k resistor. Unfortunately I'm experiencing exactly the same behaviour as previously. 4th sensor takes out the temperature data feed.
Any other thoughts on getting more sensors online?
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