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Using a dual 7-segment display, a DS18B20 temperature sensor and a couple of shift registers I figured that I could build a digital thermometer.
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Signing UpStep 1Temperature Sensor
The sensor I'm using is the DS18B20, it's a 3pin sensor that just requires a single input pin from the arduino. Multiple sensors can be hooked together, however I'm just using one for this project. As with a lot of different sensors there's a handy library that makes it particularly easy to get the temperature in centigrade or fahrenheit, it's the Dallas_Temperature library available here and a spec sheet for the sensor available from maxim.
To connect it to the arduino connect the ground pin on the sensor to a ground pin on the arduino, put a 4.7k resistor between pin 2 and pin 3 on the sensor, connect pin 3 to 3.3v from the arduino and then connect pin 2 to digital input on the arduino. Once this is done, we're ready to read the temperature!
To connect it to the arduino connect the ground pin on the sensor to a ground pin on the arduino, put a 4.7k resistor between pin 2 and pin 3 on the sensor, connect pin 3 to 3.3v from the arduino and then connect pin 2 to digital input on the arduino. Once this is done, we're ready to read the temperature!
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nice project, i wonder if i can put an interrupt on this program. I will greatly appreciate if you can help me making it work.Thank you.
Could you please help out with the schematics? The schematics pic you posted seems very blur.. cant make out what the pinouts are. Thanks!
I like your design, using shift registers to free arduino pins is nice and expandable should one want to display really hot or cold temperatures or 1/10 of a degree.
One small detail, you do use Shift-registers, but haven't told which ones, several different ones exist...