Digital DC watt meter project using pic microcontroller
Digital dc watt meter using pic microcontroller is used to measure dc power of dc circuits. Voltage and current sensors are used in this project. Voltage and current sensors are interfaced with microcontroller. Voltage sensor is used to measure voltage across circuit or load. Current sensor is used to measure current passing through load. Voltage divider circuit is used to measure high voltage. because microcontroller can not read high voltage or voltage more than 5 volt. Shunt resistor is used as a current sensor.Shunt resistor is used to convert current into voltage form. Because microcontroller does not understand current. Microcontroller can read voltage directly. Liquid crystal display is used to show measured value of dc power. Digital dc watt meter is very simple to use and basic idea of digital dc watt meter is given in this project.
To understand this project completely you should know how to measure dc voltage using pic microcontroller? How to measure dc current using pic microcontroller? How to interface LCD with pic microcontrollers? If you don’t know about it, I recommend you to read following articles first. So that you can get better understanding of digital dc watt meter project.
- LCD interfacing with PIC16F877A microcontroller
- How to measure dc voltage using PIC16F877A microcontroller
- How to measure dc current using PIC16F877A microcontroller
I hope that you have gone through above three article and understand them completely. If yes, you can easily design digital dc watt meter using instructions given below.
circuit diagram of digital dc watt meter is given below. 0.47 resistor is used as a shunt resistor and I have explained its purpose in digital ammeter project in detail. Resistor R1 and R4 is used as a voltage divider. I have explained their functions in digital voltmeter project. LCD displays measured DC power by fetching its value from PIC16F877A microcontroller. 8MHz crystal is used to operate PIC16F877A microcontroller. DC ammeter used in below circuit is just for simulation purpose.
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