Introduction
This experiment demonstrates how to use the LM3914 LED bar graph driver IC to display a voltage level as a bar graph of LEDs.
Materials Required
- LM3914 LED Bar Graph Driver IC
- LEDs
- Resistors
- Voltage Source
- Breadboard and jumper wires
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Circuit Diagram
The LM3914 IC drives a series of LEDs in a bar graph configuration based on the input voltage, indicating the level of the signal.
Steps for the Experiment
- Connect the LM3914 IC to the breadboard.
- Connect the LEDs to the output pins of the LM3914.
- Feed a voltage signal into the input pin of the IC.
- Observe the LEDs light up in a bar graph pattern based on the input voltage.
Explanation
The LM3914 converts an analog voltage into a visual representation through a series of LEDs, with each LED corresponding to a voltage level.
Results and Observations
- The LEDs should light up sequentially in a bar graph pattern as the input voltage increases.
