Temperature Displayed on 4 Digit 7 segment (common anode)

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This was a really quick project I've made recently, a simple 4 digit 7 segment common anode that displays the room temperature:
you can find the code and schematics for free here:

Also you can check the circuit in action :

Thanks for reading

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Very nice project! My original inspiration in buying an Arduino was to create a thermostat for temperature in a house. Output current temperature, allow input through maybe an Android cell phone to adjust temperature and automatic shut off when that temperature is reached. Something very similar to the NEST thermostat system seen here:

Except not as pretty.

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dugup46:
Very nice project! My original inspiration in buying an Arduino was to create a thermostat for temperature in a house. Output current temperature, allow input through maybe an Android cell phone to adjust temperature and automatic shut off when that temperature is reached. Something very similar to the NEST thermostat system seen here:

http://www.nest.com

Except not as pretty.

Thanks!
yeah that's an interesting project I already saw some similar projects and they are really useful!

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Hello! First post

I am considering buying my very first arduino uno setup after seeing your project. I want to build a thermometer with at 7-segments display for my espresso machine. But before I go shopping, I want to know if it is possible to use a T-type thermocouple as a sensor instead of the one you have used? I want to use a T-type thermocouple like this:

http://www.ebay.com/itm/T-type-fine-wire-Thermocouple-sensor-probe-1m-200-C-Class-1-SLE-PFA-Teflon-/151000241410?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item232850d502

Kind regards

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ESPRESSO:
I want to use a T-type thermocouple like this:

Since you haven't actually bought anything, you might spend some time questioning why you would want to use such a device. A DS18B20 is simpler to use, half the price, and well suited to deliver four digits onto a coffee machine.

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I have thoughts on later to add features such as PID, brew timer / countdown timer, pump delay (preinfusion) and maybe volumemetric dosing. Also I like the "retro look" of the 7-segments display.

edit:
The temperature sensor is positioned in a place where there is almost no free space(aprox. 0,25mm). I have already bought the T-type thermocouple I link to and it barely fits.

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Hi, the use of a T-type thermocouple will mean you have complicated the project considerably.
The sensor used by the originator of the is thread used a simple device with an output easily measurable by the arduino.
The T-type thermocouple puts out millivolts for the temperatures you will be measuring, as against volts with the DS18B20.
You will have to amplify the thermocouple output using low noise instrument amplifier to get a voltage level that you can measure with the arduino.
The arduino will be capable of doing what you ask, but with a lot of effort.
What programming and electronic experience have you got, this will help us to guide you through the evolution of your project.
Have you tried any of the examples in the playground /learning area of this forum?

Tom.....Hope to help..... :slight_smile:

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