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 LEDs. The project is based on the famous LM3914 IC from Texas instruments.
The project is used as a Variable Range LED Voltmeter. The LEDs 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 LEDs 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||LM3914||Integrated Circuit (IC)|
|10||3mm Red (Clear)||LED|
[ 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.
Sharing is Caring!
If you like this project, or maybe, know someone else that might, why not click the buttons below to share the experience!
We are building an international community of engineers, programmers, builders, makers, nerds and geeks, join in below. Ask questions about this module or perhaps share your projects and show others how you have used this information to do something kool!
We will be launching the Tsukure TV YouTube Channel very soon! Subscribe now so that you don't miss out on the BIG LAUNCH!
Just An Idea!
This project is currently just an idea, a prototype! This is how we begin our journey of discovery and welcome you to join us.
Why not have a go at making this idea into a working project.
- Tsukure Mad Labs
- Tsukure Preppers
- Tsukure Smart Garden
- Tsukure Smart Home
- Tsukure Spy
- Tsukure Studio
- Tsukure Tactical
- Tsukure Worx
Our team of engineers and coders have been busy building our own resources to allow us to improve our workflow. You too can have these resources at your disposal.Go!
- Ohm's Law Calculator
- Voltage Divider Calculator
- Resistor Color Codes
- LED Array Wizard
- LED Resistor Calculator
- Capacitor Code Calculator
- Capacitor Code Table
- Capacitor Conversion Chart
- Wire Gauge Reference Table
- Coil Inductance Tool
- Inductance Unit Convertor
- Passive Corss-Over Calculator
- 2-Way Audio Cross-Over Calculator
- 555 A-Stable Calculator
- 555 Mono-Stable Calculator
- Convert Image to XBitmap
- Make Boxes
- Make Rack Boxes
- GrabCAD 3D Models
- 3D Content Central
- Convert STEP to STL
- Autodesk Eagle Library Search
- SnapEDA Eagle Library Search
- Autodesk Library