Voltmeter and Ammeter using PIC Microcontroller - Voltmeter and Ammeter can be easily made using PIC Microcontroller having ADC (Analog to Digital Converter). I am using PIC16F877A and the result is displayed on an LCD Display.
PIC16F877A is enough if you do this project only for testing purposes. I suggest to use PIC with low pin numbers and multiplexed 7 segment display if you wish to use this as your measuring instrument.
This circuit is designed to measure 0 to 30V. So we will map 0 to 30V to 0 to 5V by using a voltage divider. Current through a circuit can be measured by introducing a 1 ohm resistor and measuring the voltage across it. To minimize the path resistance we will use .47 ohm special resistor with fuse (shown in figure) and current is calculated. Voltage and Current Sampling circuit is shown below.
To display the results in LCD Display we need to convert these readings into string, we use the user defined function look() for it. It converts each digit in the reading to corresponding character (see the source code).
Circuit Diagram
Note: VDD and VSS of the pic microcontroller is not shown in the circuit diagram. VDD should be connected to +5V and VSS to GND.
You can download the hex file, MikroC source code, Proteus files etc here…
For more detail Voltmeter and Ammeter using PIC Microcontroller
PIC16F877A is enough if you do this project only for testing purposes. I suggest to use PIC with low pin numbers and multiplexed 7 segment display if you wish to use this as your measuring instrument.
This circuit is designed to measure 0 to 30V. So we will map 0 to 30V to 0 to 5V by using a voltage divider. Current through a circuit can be measured by introducing a 1 ohm resistor and measuring the voltage across it. To minimize the path resistance we will use .47 ohm special resistor with fuse (shown in figure) and current is calculated. Voltage and Current Sampling circuit is shown below.
To display the results in LCD Display we need to convert these readings into string, we use the user defined function look() for it. It converts each digit in the reading to corresponding character (see the source code).
Circuit Diagram
Note: VDD and VSS of the pic microcontroller is not shown in the circuit diagram. VDD should be connected to +5V and VSS to GND.
You can download the hex file, MikroC source code, Proteus files etc here…
For more detail Voltmeter and Ammeter using PIC Microcontroller
