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Measure Temperature with the Dallas Maxim DS1820 sensor?

Measure Temperature with the Dallas Maxim DS1820 sensor?

Sometimes we have a need to measure the temperature of a room, of an object or just maybe a terrarium;

Today you have a great number of temperature sensors, analog and digital ones. If you want to use an ADC (Analog to Digital Converter) then you can use a thermistor for this project, however I prefer digital sensors. In this project I used the Dallas Maxim DS1820 (click for the datasheet) digital temperature sensor with the 1wire technology from Dallas Maxim.



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It is not manufactured anymore but it is equivalent to its successor DS18S20. You can order a sample from Maxim, of course free of charge. This time the source code was not a problem, I found the source for this project in CodeVision?s C example folder (there are a lot of examples also for GNU AVR GCC), I just modified it a bit, I removed some of the code that we won?t need because I used only one DS1820 sensor however you can attach up to 8 sensors on one wire, cool isn?t it?!?! I had not a 4.7k resistor to connect between DQ (the middle pin from the sensor which is used to communicate with it the microcontroller and to read the temperatures) and Vdd, instead I used a 6.8k resistor; it will work fine, don?t worry. DQ is connected to I/O line 6 of PORT A. The microcontroller I used was the ATMega16 and a crystal of 4 MHz frequency; it should work with any other microcontroller as well. I won?t explain how I connected the LCD because I did it in one of my previous projects. It is connected to the PORT C, just to display the results (the current temperature).

Article by Sebastian Schmieg at http://www.e-dsp.com

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