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How do you use an analog comparator?
The light sensor can be tested using the analog comparator inputs of the 16F917, which allow two input voltages to be compared. An output bit in a status register is set if the positive input (C+) is at a higher voltage than the negative input (C−) or a reference voltage.
What does an analog comparator do?
The Analog Comparator is used to compare the voltage of two analog inputs, with a digital output indicating which input voltage is higher. Inputs can either be one of the selectable internal references or from external pins. The comparator output can be sent directly to GPIO or PRS.
What is comparator used for?
A comparator circuit compares two voltages and outputs either a 1 (the voltage at the plus side; VDD in the illustration) or a 0 (the voltage at the negative side) to indicate which is larger. Comparators are often used, for example, to check whether an input has reached some predetermined value.
How to use the analog comparator to determine when an…?
I cannot find any example code that says how to do this, although I have read that the analog comparator can compare the voltage on an analog pin with the voltage output by a PWM pin. I do not understand how this would work as the PWM pins do not output an analog voltage, but a pulse width modulated square wave.
How are analog comparators used in PIC microcontroller?
PIC16F877A consists of two analog comparators which can be used in eight different modes. The input pins of comparator are multiplexed with I/O port pins RA0 through RA3 while output pins are multiplexed with RA4 and RA5.
What are the input and output pins of comparator?
The input pins of comparator are multiplexed with I/O port pins RA0 through RA3 while output pins are multiplexed with RA4 and RA5. CMCON register is the Comparator Module control register.
What is c1out in analog comparator 1 output bit?
C1OUT is the bit label assigned to the Comparator 1 output bit, which is tested using the if statement. The LED output is then switched accordingly. The pot sets the switching level, and a desk lamp or flashlight was found to work as a light source. The LED should go on when the light source goes off.