Tsukure Mad Labs Variable Range Digital Voltmeter

This is a variable range LED bar graph voltmeter project. It is a simple and less expensive project that displays voltage of a given source with the help of 10 LED’s. The project is based on the famous LM3914 IC from Texas instruments.

The project is used as a Variable Range LED Voltmeter. The LED’s indicate the range of the input voltage applied. A power supply of 12 VDC is applied through the CN2 connector, and the variable input voltage supply is applied to the CN1 connector. IC LM3914 is a dot/bar display driver; it senses the analog voltage levels and displays its range on the LED's.

The LED’s indicate depending upon the variable input voltage applied. Using the jumper we can select the mode of LED display. When the jumper is open it is in dot mode and when it is closed it is in bar mode. Range adjustable 0-1.3 V and 0-10.8V.

Components used in this module...

Find out more about the components used in this STEM Module.

Let's Get Started!

Below you will find a list of bits to gather before hand, followed by a detailed schematic. Using a breadboard lay out the components and connect them together as shown. Alternatively you can purchase this module from our shop and simply solder the components in the places indicated on the quality assured printed circuit boards provided.


What You Need...


1 104 (100nF / 0.1uF) Capacitor (Ceramic)
1 10uF Capacitor (Polarized)
1 LM3914 Integrated Circuit (IC)
10 3mm Red (Clear) LED
1 1K2
[ Brown, Red, Black, Brown ]
Resistor (0.25 Watt)
1 10K (103) Resistor (Trim Potentiometer)

NB: Any resistor colour codes specified relate to 5 band resistor codes, the 5th band has not been shown intentionally. The 5th band indicates the resistor tolerence, we use only the highest tolerence resistors in our products.


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