TECHNICAL SUPPORT
Published 2026-03-02
When you are usingservos to make products, do you often encounter this situation: even though the program is written, theservos are stuck when turning, or the speed is too slow to keep up with the rhythm, or it keeps shaking? Don't worry, this is probably due to a lack of understanding of speed control. Today we will talk about steering gear speed adjustment and help you get over this hurdle.
Simply put, steering gear speed regulation is to control how quickly it goes from point A to point B. Many people think that the steering gear only has two states: "turning" and "not turning", but this is not the case. Imagine you're driving a car. You can't just step on the accelerator and rush out, right? There must be a smooth acceleration process. The same principle applies to steering gear.
The PWM signal we commonly use, that is, the pulse width modulation signal, is like a command sent to a steering gear. Changing the duty cycle of this signal can allow theservoto smoothly transition between different positions instead of jumping over with a "pop". The speed of this transition is what we call speed.
This has to start with practical application. Think about it, if your smart car turns and the steering gear swishes to death, won't the car body just turn over? Another example is making a robotic arm to grab things. If the movement is too strong, an egg will be crushed.
Speed regulation brings two obvious benefits. The first is to make the movements more natural and more like human operation, and the product experience will be directly upgraded to a higher level. The second is to protect the mechanical structure and reduce impact and wear. Your products can be used longer and have fewer failures. So regardless of the fact that speed adjustment is just a small detail, it has a huge impact on product quality.
This method is actually not complicated. To put it bluntly, it is "step by step". Don't think about turning the servo from 0 degrees to 90 degrees in one breath. We can divide it into 10 steps, 20 steps or even more small steps. Every time you take a small step, pause slightly, for example, for tens of milliseconds.
The specific implementation into the code is to use a for loop so that the angle value can slowly increase or decrease. Whenever the angle value changes by one degree, the function of writing PWM is used to update the position of the servo, and then a delay is added. It should be noted that the longer the delay time is, the slower the steering gear will rotate. You can set this delay time as a variable and adjust it at any time. As long as you try a few more times, you can find the speed that best suits your product.
The above code operations are of great significance in practical applications. By adjusting the variable delay time, the rotation speed of the servo can be accurately controlled according to the needs of different products. In some scenarios that require a high rotation speed of the servo, the delay time can be appropriately shortened to allow the servo to respond quickly; while in some scenarios that require slower rotation, the delay time can be lengthened. In this way, it can better meet the diverse requirements of various products for steering gear speed and improve the performance and applicability of the products.
There are two main types of servos on the market, analog servos and digital servos, with different speed adjustment ideas. For ordinary analog servos, you have to rely on the program we mentioned above to achieve smooth rotation by controlling the signal frequency.
If you are using a digital servo with feedback function, which is often called a serial port servo, then the operation will be easier. Many of these servos already support direct speed adjustment internally. You only need to send an instruction through the serial port to clearly tell it the angle and speed of rotation, and the subsequent work will be handled by the servos themselves. If your product budget is within the allowable range, choosing this kind of servo can save a lot of programming effort.
If the servo you choose is not an ordinary servo, but a special servo with more complex functions, the operation method may be very different. Special servos may require additional circuitry to assist them in achieving certain specific functions, and may require a more precise command format when controlling its rotation. However, once you are familiar with its characteristics, you can take advantage of its unique advantages and add more functions and highlights to the product. But if your product budget is limited, you need to weigh the pros and cons more carefully when choosing a servo and find the most suitable solution to ensure that you meet the product needs without exceeding the budget.
After adjusting it for a long time, the servo is still shaking? Don't be discouraged, this is the only way to success. During the debugging process, the most common problem is insufficient power supply. The moment the servo is started, the current required is considerable. If the power supply is not strong and the voltage drops, the control chip will be reset or the signal will be disordered. As a result, the servo will naturally vibrate. Therefore, be sure to choose a power supply with good performance or add a large-capacity capacitor to the circuit.
In addition, if the above method still fails to solve the problem of servo vibration, other possible factors need to be further investigated. For example, check whether the connection between the servo and the control circuit is stable and whether there is looseness or poor contact. At the same time, you should also pay attention to whether the transmission of the control signal is normal and whether it is interfered with. Only through comprehensive and detailed inspection and analysis can we accurately identify the problem and effectively solve the problem of steering gear vibration.
Another pitfall is that the delay time is not calculated properly. Latency in the code will affect servo response, but it will also affect your efficiency in performing other tasks. You can try using scheduled interrupts for servo control, or use non-blocking programming ideas, which can smoothly adjust the speed without delaying the main program to do other work.
Once the software is tuned, the hardware must keep up. First of all, the installation of the servo must be stable, and the linkage mechanism cannot have too much gap. Otherwise, no matter how smooth the program is, it will be useless even if the physical structure is stuck. Check your servo arms and connections to make sure they turn smoothly.
Keep signal lines as short as possible and away from high-current interference sources such as motor drives. If conditions permit, using shielded signal lines or adding a magnetic ring can effectively reduce jitter caused by external interference. By paying attention to these small details, you will find that the speed problem that was originally difficult to adjust will be solved in one fell swoop.
Finally, I want to ask you: When debugging a product, do you prefer to slowly adjust parameters through software, or directly change the servo to get it right in one step? Welcome to chat about your experience in the comment area. If you find it useful, don’t forget to give it a like and share it with more friends who make products!
Update Time：2026-03-02
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