TECHNICAL SUPPORT
Published 2026-02-14
When doing product innovation, the most troublesome thing is often not the idea itself, but how to get the idea moving. Especially when you need to control severalservos at the same time and make them work together obediently, the question arises - should you use traditional PWM signals to connect them one by one, or use a serial bus?
The more mainstream solution at present isthe five-wayservocontroller. To put it bluntly, this thing is just a small box that can manage fiveservos at the same time. Its greatest value is that it frees you from complex timing and interrupt processing. You only need to tell it "which angle to go to", and it takes care of the rest. Using it, you can focus on product design itself instead of struggling with the underlying code.
When using this controller, the first intuitive feeling is that the circuit is simple. In the past, when controlling five or six servos, the PWM pins on the microcontroller were basically full, and power supply and signal interference had to be considered. Nowadays, many controllers communicate through serial ports (such as TTL or RS485). You only need two wires to control all servos. They are connected in series like building blocks, and the board is clean and neat.
️ The second benefit is that the movement is smoother. If you want the robotic arm to go from point A to point B, it is very difficult to write the interpolation algorithm yourself. The controller has built-in speed control and trajectory planning. You only need to set the starting point and end point, as well as the movement time, and it will automatically help you calculate the path in the middle. When the servo rotates, it will be smooth, without the feeling of stopping at all.
There are many such products on the market, so you need to pay attention to a few points. The first is the communication interface. If your main control is, it is very convenient to choose a TTL level serial port controller; if it is used in an industrial environment, the distance is long and the interference is large, the RS485 interface is more reliable. The interface determines your subsequent connection method and stability, so it’s best to think about it in advance.
Secondly, it depends on the driving capability of the controller. The operating current of each servo is not small, and the instantaneous current may be very large when five channels are moving at the same time. A good controller will indicate the maximum continuous current of each channel and have voltage stabilization and protection circuits. Pay attention to the parameters when choosing. Don't buy it and find that the power supply is insufficient and restart it at every turn, which will delay things.
It is most widely used in the field of robotics. For example, making a six-legged robot with two servos on each leg would be just fine with two controllers. Through the controller, you can easily realize various gaits, such as triangle gait and wave gait, so that the robot walks gracefully. If you engage in maker education or participate in competitions, this solution can greatly shorten the development cycle.
There are also bionic joints and robotic arms. Imagine making a flapping bird, or a small desktop-level robotic arm to grab things. Five servos correspond to five joints. Through the SDK provided by the controller, you can debug the angle of each joint in real time on the computer to find the most elegant motion trajectory and create many tricks.
Don't think too complicated, it's actually very quick to get started. The first step is to connect. Connect the controller to the power supply, and then plug in the signal cable and power cable of the servo accordingly. Note that many controllers support independent power supply for servos. If your servos are powerful, it is recommended to connect an external power supply instead of taking power directly from the controller. This is the safest way.
The second step is to adjust the communication. Use the USB to serial port module to connect the controller to the computer and open the debugging assistant provided by the manufacturer. Generally, you set the baud rate and then send a simple command, such as turning servo No. 1 to 90 degrees. When you see that the rudder is moving, congratulations, you are already halfway successful. The next step is to read the manual, become familiar with the instruction set, and slowly combine complex actions.
Some cheap controllers have particularly poor software support, the information provided is from three to five years ago, and the chips they use have been discontinued. After buying this kind of product, you can't even find technical support when you encounter problems, so you have to go through the code yourself, which is a huge waste of time. It’s best to choose brands that continuously update their firmware, have detailed routines, and have an active community.
Another thing to note is, don’t just look at the number of channels but not the current. Some are nominally five-channel, but the total output current is only 2A. It cannot be driven by connecting five slightly larger servos. Calculate the stall current of the servo you are using and leave enough margin. Generally speaking, it is safer to choose one with a continuous output of more than 5A, so that it is more comfortable both in debugging and actual operation.
If you want them to cooperate well, the core is "time synchronization". For example, to make a dancing robot, you need all the legs to start moving at the same time and reach the designated position at the same time. Many controller instructions have "execution time" parameters. When you send instructions to each servo, include the same time, and they will automatically complete the action synchronously.
You can use the "Group" function multiple times. Divide the five servos into two groups, such as a left leg group and a right leg group. Then set different action sequences for the two groups. Through this group rotation, you can achieve the natural effect of alternating steps. Try it a few times to find the right combination of delay and angle, and your work will come alive.
Okay, we’ve basically talked about the basics ofthe five-way servo controller. I wonder what is the most difficult control problem you have encountered when working on a steering gear project? Welcome to chat about your experience in the comment area. If you find the article useful, please like it and share it with more friends who need it.
Update Time：2026-02-14
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