TECHNICAL SUPPORT
Published 2026-02-07
Have you ever encountered this problem: You want to make a cool robot or smart toy, but find that theservois slow to respond, not accurate enough, or very troublesome to control? The problem is most likely with the control core. Many enthusiasts and even small and medium-sized manufacturers are still using development boards to directly driveservos. This is like using a computer motherboard to directly connect a light bulb. It is not impossible, but it is inefficient and weak in function. Today we will talk about the key component that can completely change this situation-the steering gear control chip .
Simply put, it is the "dedicated brain" of the steering gear. Ordinary microcontrollers can also controlservos, but you need to write a lot of code to process signals (timing). Thesteering gear control chipis specially designed to do this job. It integrates a circuit that generates precise pulse signals. You only need to tell it "turn to 90 degrees" and it will automatically output the PWM wave of the corresponding width, which is worry-free and accurate.
You can think of it as a "command translator". Your main controller (for example, Raspberry Pi) sends a simple command, such as speed and angle, and this chip is responsible for translating it into a series of precise pulse signals that the servo can understand. In this way, the burden on the main control is greatly reduced, and it can handle more important tasks, such as image recognition or path planning.
The first thing to solve is the "resource occupation" problem. If one main control directly controls multiple servos, the CPU time will be cut into pieces by frequent interrupt service routines, and the system will easily freeze. After using a dedicated chip, it works independently. The main control only needs to send an instruction once when the angle needs to be changed. The communication efficiency skyrockets and the entire system is smoother and more stable.
Secondly, solve the pain point of "accuracy and stability". If the main control program is interrupted by other tasks, it may cause slight jitter in the output PWM signal, and the servo will buzz or vibrate slightly. The dedicated chip and hardware circuit ensure that the signal is clean and stable, the servo operates quietly and the positioning is accurate. This is crucial for demanding applications such as robot joints and gimbal cameras.
Take a look at the number of channels. How many servos do you need to control at the same time? Common ones include 8-way, 16-way, and 32-way chips. Don’t buy too much and cause waste, and don’t buy too little to use. ️ It is recommended to reserve 2-4 channel margins based on your actual needs to leave room for subsequent upgrades.
Second, look at the communication interface. I2C and serial port (UART) are the most common. I2C wiring is simple (two wires), but the protocol is slightly complex; the serial port is intuitive to understand. Choose based on your main control interface and programming familiarity. Also pay attention to whether the working voltage of the chip matches your steering gear system.
The wiring is actually very simple. There are only three core wires: power supply, ground wire, and signal wire. The power supply must be connected stably. It is recommended to provide a separate power supply to avoid lowering the voltage and affecting the main control when the motor is in action. The signal line is connected to the corresponding output channel of the chip, and the chip itself is connected to your main controller through I2C or serial port, such as the GPIO port of Raspberry Pi.
The steps to use are more fool-proof: 1. Initialize communication; 2. Set the servo rotation range (such as mapping to 0-180 degrees); 3. Send angle or time commands. Many chip manufacturers provide ready-made library files. You can just call a function like(, 90)directly, and a bunch of servos can move uniformly in a few minutes.
The most common problem is that the servo doesn't move at all. Don’t panic yet, check in order: 1. Is the power light on? Make sure the power supply is normal. 2. Are the communication lines connected correctly? Use a multimeter to test continuity. 3. Is the address setting correct? The I2C device has an address, make sure it is consistent with what is written in the program. Most problems lie in these three steps.
If the servo rotates or shakes randomly, it may be due to signal interference or insufficient power. Check whether the signal cable is too long and keep it as far away from the motor power cable as possible. At the same time, make sure that your power adapter can provide sufficient current. All servos have a large current when they are blocked. If the power supply is not strong, they will collectively go crazy. Adding a large capacitor to the power input often works wonders.
One of the trends is high integration. Future chips may incorporate motor drive, current detection and even simple trajectory planning functions, turning them into true "motion control units". You only need to say "pick up that cup", and the chip itself can coordinate multiple joints to complete smooth movements, further reducing the difficulty of development.
Another trend is intelligence and networking. The chip itself may integrate a small real-time processor and network protocol stack, which can directly respond to instructions from the cloud or mobile app to achieve remote and synchronous group control. This will open up a whole new space of imagination for education, entertainment and light industrial automation scenarios.
After reading so much, are you already thinking about your next project? Are you planning to make a multi-legged robot or create a dynamic art installation? Welcome to share your ideas in the comment area, or talk about the headaches you have encountered when using servos. If you find this article helpful, don’t forget to like and share it with friends around you who also love to toss!
Update Time：2026-02-07
Contact Kpower's product specialist to recommend suitable motor or gearbox for your product.
