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Return to BlogMini Digital Voltmeter with 3-Digit Display
Posted Feb 09, 2012 at 10:10 am
Figure 1
A PIC version of digital voltmeter module was created based on an AVR while showing the mini display with 3 digits.
The digital voltmeter module contains general purpose I/O pins which could be used to read a digital sensor and be able to display the value. Using a non-linear formula, the module can be freely programmed and calibrated.
The idea on constructing the circuit eliminates the usual problem of local digital voltmeter modules wherein the module cannot be powered from the same power that is intended to be measured. The circuit provided the solution by taking a small microcontroller with built-in analog to digital converter (ADC) and adding a display. The numeric display is attached to a microcontroller by using 74HC4511 7-segment driver or driving only one 7-segment display at a time and one display after the other.
The result of ADC reading can be defined in what number on the display where the LEDs are frequently refreshing if the display is flicker-free. The high power consumption of 21 LEDs can be compensated by a transformer inside the equipment. The ADC inside the microcontroller is a 10-bit converter with several Mega Ohms impedance.
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2 years ago: What are you sharing or selling? Where is the circuit diagram or kit advertisement? What does AVR mean?
2 years ago: hi david, you should click "Read More" link at the and of the text to go to the project page.
2 years ago: hi david, have you found what you are asking for? try to be more resourceful on this page coz some circuit diagrams are better off not to be shown especially if it consists of several stages...