How To Easily Drive A Servo With Arduino, Even Novices Can Get Started Quickly

Have you ever encountered this situation: watching others use it to make theservorotate flexibly, but when you do it yourself, you always get stuck on the wiring or code? Don't worry, today I will take you step by step to solve the introductory problem of "how to control theservo", so that you can quickly take the first step.

What exactly is a steering gear?

You may have seen it in remote control cars or robots. Simply put, a steering gear is a motor that can precisely control the angle, such as turning it to 45 degrees or 90 degrees and then stopping it there. It integrates a control circuit inside. We only need to send a pulse signal to command it to move to a designated position, without having to worry about complicated motor driving.

A commonservohas three wires: power wire (red), ground wire (brown or black) and signal wire (orange or yellow). For beginners, the low-power servo can draw power directly from the 5V pin, which is very convenient. When wiring, just connect the power supply and ground correspondingly, and then connect the signal line to a digital pin, and the hardware part is complete.

How to write code with the least worry

Writing code is actually the easiest part of the whole process. The Servo library that comes with the IDE has helped us encapsulate all complex operations. You only need to import this library, then create a servo object, use.(9)in the setup function to connect the servo to pin 9, and then use.write(90)to make it rotate to 90 degrees.

️ Try this introductory code: first turn the servo from 0 degrees to 180 degrees, turning 10 degrees each time and pausing for 15 milliseconds. The effect written in this way is very smooth, allowing you to intuitively feel the rotation process of the servo. Remember to use a loop structure in the loop function, and with appropriate delays, you can create a beautiful back-and-forth sweeping effect.

What’s the point of controlling the angle?

You may be asking, how does the angle value of the servo correspond to the physical position? In fact, it is very simple. Just fill in the integer between 0 and 180 in thewritefunction. 0 degrees corresponds to the limit of one end, and 180 degrees corresponds to the other end. But please note that the actual rotation range of servos of different brands may be slightly different. You can first usewrite(90)to test whether the middle position is accurate.

If you need finer control, such as accurate to 0.5 degrees, you have to usefunction. The pulse width range of the standard servo is 1000 microseconds to 2000 microseconds, corresponding to 0 to 180 degrees. By adjusting this pulse width value, you can achieve higher-precision positioning, which is especially useful when making some precision mechanisms.

What should you pay attention to when supplying power?

The first pitfall that many novices encounter is insufficient power supply. When the servo starts to rotate, the current will increase instantly. If the 5V pin is directly used to drive multiple servos or high-power servos, it is likely to cause a restart or the servo to become weak. At this time you need to provide separate power supply to the servo.

A safe approach is to use a 5V power module or several batteries to power the servo, connect it to the GND of the servo (to the same ground), and then only connect the signal line to the servo. This not only ensures the power of the steering gear, but also protects the safety of the board. Remember, no matter what method of power supply is used, the principle of common ground must be adhered to.

How to play with multiple servos

When your project requires controlling multiple servos at the same time, the method is also very simple. Just create multiple Servo objects, each corresponding to a servo, controlled by different digital pins. It should be noted that the timer resources are limited. For example, the Uno board can drive up to 12 servos, but if you also use other libraries that rely on timers, the number will be reduced.

️ Here is a practical tip: first test how many servos your project requires to work at the same time. If the quantity is not enough, you can consider expanding it with a servo drive board. In addition, the timing of the actions of multiple servos is also very important. Usedelayto control the sequence, or useAchieving non-blocking control can make your action choreography more flexible.

What should I do if the steering gear doesn’t move?

If your servo doesn't respond, don't panic yet. Check in this order: first, check the power supply to see if the LED indicator is normal, or use a multimeter to measure the voltage; second, check the wiring to ensure that the signal line is connected to the pin specified by the code; third, confirm whether the code is called correctlyfunction. Most problems lie in these three links.

If the servo makes a "sizzling" sound but doesn't move, it's usually due to too much load or angle limitation. You can first remove the load and test the servo independently to confirm that it can rotate freely. Another situation is that the angle value in the code exceeds the range of the servo. Try to limit the parameters to 0-180. As long as you follow the steps patiently, the problem will be solved quickly.

After reading this, I believe you already have a complete idea of how to drive the servo. So here comes the question - when you are working on your first steering gear project, do you want to control a robotic arm, or do you want to add a steering function to your car? Welcome to share your creativity in the comment area. If this article helped you, don’t forget to give it a like and support!