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Learn how to enhance your Arduino project by adding a blinking LED to your servo motor control. This step-by-step guide makes it easy!
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This video is based on the question https://stackoverflow.com/q/72066118/ asked by the user 'Josh' ( https://stackoverflow.com/u/16999929/ ) and on the answer https://stackoverflow.com/a/72066557/ provided by the user 'cguk70' ( https://stackoverflow.com/u/18127542/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Easily Add a Blinking LED to Your Arduino Servo Project

Arduino projects are a fantastic way to blend software and hardware, allowing enthusiasts and professionals alike to create impressive and interactive devices. One common project involves controlling a servo motor; however, you may want to add a visual element to your design, such as a blinking LED. In this guide, we’ll explore how to toggle an LED on and off while the servo motor is in motion.

The Problem: Adding a Blinking LED

You may find yourself with an existing Arduino code, structured to turn a servo motor back and forth. If you're looking to add a blinking LED effect while the motor operates, you'll want to modify the code effectively. Here’s the initial code for your servo motor to get you started:

[[See Video to Reveal this Text or Code Snippet]]

In this code, the servo moves from 0 to 180 degrees and back, but there is no blinking LED. Let's refine the solution and integrate the blinking LED functionality.

The Solution: Integrating the Blinking Feature

To introduce the blinking functionality, we will make a few key adjustments to the original code. Here’s the revised code that includes the necessary changes:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of Changes

Here’s how we've enhanced the code to incorporate an LED that blinks while the servo operates:

Constants and Variables:

A new constant BLINK_DELAY controls the speed of blinking (set to 100 milliseconds).

Two new variables, blink_time and led_on, are used to manage the timing and state of the LED.

Setup Function:

Initializes pin 13 as an output for the LED in the setup() function.

Loop Function Modifications:

The start_blink() function is called before starting to move the servo to turn the LED on.

The blink() function is invoked within the servo movement loops, allowing the LED to toggle while the servo is moving.

The stop_blink() function is called after each complete 0-180 and 180-0 cycle to turn the LED off temporarily.

Blink Functions:

start_blink(): Turns the LED on and initializes the timing for blinking.

stop_blink(): Turns the LED off.

blink(): Checks the current time and toggles the LED state based on the delay.

Conclusion

Integrating a blinking LED with a servo motor in your Arduino projects is a fun way to enhance visual feedback. By following the example provided, you can successfully modify your current code to achieve this effect. Experiment with different BLINK_DELAY values to find the perfect blink speed for your project. Happy coding!