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The temperature sensor and the digital output circuit

2014-11-11 02:41  
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Next, the temperature sensor and the digital output circuit. The most effective way is to grasp the principle of combining schematic view text, combined with text to understand the principle. See Figure: This is a very simple implementation of a temperature sensor. It uses LM35DT as a semiconductor temperature sensors operate at 5 VDC. It generates an analog output voltage proportional to the change of the ambient temperature in Celsius temperature scale (2 mv / C). Sensor's analog output is then passed to the ADC0804 IC generates an 8-bit binary output (digital output) correspoding to the analog input voltage. Fixed regulator IC (7805) 5 volt regulator generates an output for operating sensors and ADC0804 IC. It also outputs a variable voltage controlled variable resistor 5 k, to adjust the zoom  ADC0804  (usually the full scale, which is set to 2.5 volts). ADC digital output is then used to light-emitting LED display High / Low Logic (Leadership: logic 0, OFF: Logic 1). ADC's output can interface with a 7-segment diaply 7 segment driver or digital outputs can interface to PC / microcontroller. The bottom part of the schematic shows a fixed and variable power input 220 V AC from the wall outlet in your house, then step down transformer which 18 VAC (9-0-9 center tap), and then converted into DC using bridge rectifier. The principle is simple but effective. You can read several times to grasp the principle.

Temperature Sensor with Digital Output

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