Arduino - Potentiometer Triggers LED
In a previous tutorial, We have learned how to change the brightness of LED according to the potentiometer's output value. In this tutorial, We are going to learn how to:
- If the potentiometer's analog value is greater than a threshold, turn LED on
- If the potentiometer's analog value is lower than a threshold, turn LED off
- If the potentiometer's output voltage is greater than a threshold, turn LED on
- If the potentiometer's output voltage is lower than a threshold, turn LED off
Hardware Required
Or you can buy the following sensor kits:
1 | × | DIYables Sensor Kit (30 sensors/displays) | |
1 | × | DIYables Sensor Kit (18 sensors/displays) |
About LED and Potentiometer
If you do not know about LED and potentiometer (pinout, how it works, how to program ...), learn about them in the following tutorials:
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
Arduino Code - Analog Threshold
Quick Steps
- Connect Arduino to PC via USB cable
- Open Arduino IDE, select the right board and port
- Copy the above code and open with Arduino IDE
- Click Upload button on Arduino IDE to upload code to Arduino
- Rotate the potentiometer
- See the change of LED's state
Code Explanation
Read the line-by-line explanation in comment lines of source code!
Arduino Code - Voltage Threshold
Potentiometer's analog value is converted to voltage value, and then compared to voltage threshold to triggers LED
Video Tutorial
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