Do Design Digital Voltmeter by Yourself
Sponsored LinksThe folowing article about designing a digital voltmeter by yourself will describe you with a low cost intelligent digital 
voltmeter that can work as standalone device or can be possibly connected into PC via parallel port.
What you will find in this article are sections such as digital voltmeter system specification (Specification of external environment, System input and output specification,and System functional and operating specification), building an A/D converter as the main part of design (Types of ADC conversion, and Dual-slope conversion), State diagrams (Gain Control State Machine, and Conversion Control State Machine).
Then you will be taken into the Implementation issues which discuss connection between analog and digital part (Programmable Gain Instrumentation Amplifier PGA 204, Precision op amp LM308, Low offset voltage comparator LM393, Quad Bilateral Switch CD4066, 4-Channel Analog Multiplexer/Demultiplexer CD4051, Adjustable voltage reference LM385, NE555 timer, 74HCT162 Synchronous BCD decade counter with synchronous reset, and BCD to 7-segment latch/decoder/driver for LEDs).
Finally, you will be described with the design considerations and the testing of digital voltmeter device. Complete your read in th following DIY Digital Voltmeter article (source: ee.washington.edu)
Hello! I’m Theophilus a student at Kigali Institute of Science and Technology (KIST), in final year of Electronics and Telecommunication Enginnering.
I would like to design and implement a Digital Voltmeter using Dual-Slop Analog to-Digital Converter.
The analog input has a full scale of 10V.
The 1st step is to convert the analog input in digital output.
Binary count will count N-bit binary output. This N-bit binary will be converted in BCD code.
BCD code to seven segment decoder will be used to display the final output.