Today many manufactures produce sophisticated sensors for specific task such as sharp GP2D120X is use for distance measurement, National Semiconductor LM35 for precision centigrade temperature sensor, HS12 humidity sensor from GE, TGS2442 carbon monoxide gas sensor from Figaro and many more. Some of the basic sensor such as LDR (Light Dependent Resistor) is used for measuring the light intensity or NTC (Negative Temperature Coefficient) a special resistor for measuring the temperature. Usually we use the electronic sensor to convert the analog value to the voltage level value. The ADC is one of the important features that enable us to digitize our analog world. The PIC16F690 microcontroller is one of Microchip midrange 8-bit microcontroller that has a build in 10-bit resolution of Analog to Digital Converter (ADC) peripheral.
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