Digital watt meter with current and voltage display
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This document describes a digital watt meter that displays current and voltage. It uses a PIC16F877A microcontroller and 16x2 LCD display as key components. Voltage and current transducers send differential voltage signals to the microcontroller's ADC. Through calibration, the microcontroller calculates real power dissipation and displays it on the LCD screen. The design accurately measures power at a low cost, making it suitable for applications like measuring AC power.
Digital watt meter with current and voltage display
- 1. Logic Mind Technologies Vijayangar (Near Maruthi Medicals), Bangalore-40 Ph: 8123668124 // 8123668066 DIGITAL WATT METER WITH CURRENT AND VOLTAGE DISPLAY ABSTRACT: Design and hardware implementation of a digital wattmeter has been presented in this paper. Microcontroller PIC16F877A and a 16x2 LCD display are the major building blocks of the design. The real power information conveyed by the output signal from INBUILT PIC ADC is extracted by necessary calibration process and finally displayed to LCD display using microcontroller coding. Obtained results show fair amount of accuracy which validates our circuit design and proves precise hardware implementation. PROPOSED SYSTEM: In our design, both the voltage across and the current through the load have been taken in the form of a differential voltage using voltage and current transducers to PIC ADC. The ADC produces a square wave at its output whose frequency is proportional to the real power of the load. Detailed description of this functionality has been present in the circuit level description section. This square wave signal is sent to a input pin of a microcontroller port. The time period of the signal is measured using counter and thus its frequency is also determined. Through a calibration process described later in the paper, the dissipated real power is calculated. Finally, the calculated real power is displayed in a LCD display. In this regard, the LCD screen was properly interfaced with the pins of a port of the microcontroller. The whole process is guided by proper microcontroller coding.
- 2. Logic Mind Technologies Vijayangar (Near Maruthi Medicals), Bangalore-40 Ph: 8123668124 // 8123668066 BLOCK DIAGRAM: ADVANTAGES: 1. High-resolution, easily read display. 2. High operating frequency 3. Low cost APPLICATIONS: Ac power measurements