Digital Voltmeter:

Digital voltmeters are used to measure potentials between two different points and they display the values in the form of digits accurately that is why they are more reliable to use. The chances of making errors are less as compared to the analog voltmeter. They are more stable and provide a better interface to the user.

Design Implementation:

We are designing a circuit that will measure Voltages in Digital. All the inputs from those two potentials will be analog so we have to make all these values digital. We have many options to convert analog values to digital but we will use ICL7107 IC due to its functionality as it will convert Analog to Digital and also give us output for 7 segments which will be easy for us. ICL7107 IC will make outputs for 7 segments internally, we don’t need any additional circuit for 7 segment data converter.

Circuit Working:

First of all, We need positive and negative voltages for our circuit. Negative will be supplied to ICL7107. We will make these negative voltages with the help of a timer IC. NE555 IC will be used in Astable mode(output oscillates at a particular frequency and generate pulses in the rectangular waveform). In Astable mode, 555 will provide us continuous voltage when it will be triggered. For positive we are using 7805 LDO. It will help us connect 9-12V as input of the circuit and provide us with a constant 5V positive for ICL7107 IC. Then, we need two potential differences on pins 31 and 35. After that, we have to make the internal clock circuit for ICL7107. R1 and C1 will be used for the frequency of the internal clock. Then, we have to connect outputs from ICL7107 with 7 segments. We are using common anode 7-segments and we will supply +5V to them then, We need to ground them or provide 0 to complete their circuit. So, ICL7107 will give 0 or ground to reference pins of 7-segments. As ICL7107 is making a decision on when to turn ON 7-Segments LEDs. 0 may vary for a different set of arrangements. Like if we have to display 1 on 7-segment we have to ground or provide 0 to B and C and it may vary for a different set of numbers that will be displayed.

Components Management Libraries:

Before implementing the design in the PCB file, I have created the symbol and footprint of each component. Then I have uploaded each symbol linked with their footprint on Inventhub. Each component is attached to its supply chain. While designing the PCB board it is important to take care of the footprint and dimensions of each component. Footprints should be exactly the same as per component size otherwise your design will not be perfect.