Saturday, July 5, 2014

Digital Voltmeter Based on Microcontroller PIC16F73B Circuit Schematic + Source Code

Robotronicschool. - Before we very so sorry because for long time not update our article in this blog. And in this time we want to continue to post the next article about electronic circuit schematic of Digital Voltmeter Based on Microcontroller PIC16F73B and completed with source code.

We think there are many digital voltmeter circuit schematic that developed for us. But in here we will show you circuit schematic digital voltmeter that based microcontroller PIC16F73B as like figure 1 below.

Circuit Schematic

Figure 1. Digital Voltmeter Based on Microcontroller PIC16F73B (Source:

Component List
  1. LCD
  2. PIC16F73B
  3. VR1 = 100K


Here are the description of the Digital Voltmeter Based Microcontroller PIC16F73B as follow:   
  1. The Microcontroller fetches the analog signal through the AN0 pin of PIC16F73. The built in ADC of PIC16F73 converts the analog input to its digital value.  
  2. A fractional conversion is applied  to this digital data using an equation and the data is converted to millivolts. 
  3. Each digit is extracted one by one using the sub routine void display(). The extracted digit is matched and the corresponding seven segment pattern is fetched from the LUT written inside the mask subroutine.  
  4. The data from LUT is then passed to data bus of the multiplexed 7 segment display using pins 21 to 28 of PIC16F73. The enable pins are connected the micro controller at pins 11, 12, 13 & 14. 
  5. Finally different data are sent to different segment displays by alternately switching the enable pins within 10 ms. This way our eyes see just a 4 digits number. So here is our full project. (Source: Circuitstoday)

Source Code

And here is the link source code of this circuit schematic

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