TECHNICAL SUPPORT
Published 2026-03-14
I believe that when many friends got theservomodule for the first time, they looked at several wires of different colors and wondered in their hearts: How should I connect this? Will it burn if connected incorrectly? Don't worry, today we will talk about the wiring of theservothoroughly. I guarantee that you will be able to try it after reading this and avoid detours.
Many novice friends rush to turn on the power as soon as they get started. As a result, the servo either does not respond, buzzes, or even smokes. This is usually because the three wires of the servo are not clearly defined. The three wires of the servo are generally the power wire, the ground wire and the signal wire. However, because of the different brands and models of servos, the color order of the wires may be different, which makes it easy to get confused. For example, the most common ones are brown, red, and orange, but there are also black, red, and white ones. If you don’t confirm in advance and just follow your habits, you will most likely have problems.
To solve the wiring problem, you must first learn to understand the color code of the servo cable. The most common standards currently on the market are: the brown wire is usually the ground wire, which is the negative pole; the red wire is the power wire, connected to the positive pole; the orange or yellow wire is the signal wire, used to transmit control instructions. But there is a pitfall that you need to pay attention to. For example, some imported or old-fashioned servos may use a black wire to represent the ground wire, red to represent the power supply, and the remaining white or yellow wire to represent the signal wire. Therefore, the safest way is to take a look at the label instructions on the servo or the product manual, and do not rely entirely on color.
Before we start wiring, we have to get everything ready. ️ The first thing must be the steering gear module in your hand. ️ Then you need a main control board, such as STM32, or the simplest servo tester. ️ Next is the DuPont wire, preferably female to female for easy plugging and unplugging. ️Last and most important, is the power supply! Don't think about directly using the 5V pin on the development board to drive the high-torque servo, as that will easily burn the board. Preparing a reliable external power module, such as a battery pack or switching power supply, is the first step to success and the key to safety.
"I understand the truth, but how should I connect my steering gear?" At this time, finding the right information will get twice the result with half the effort. Don't go to Baidu to search for those messy pictures. The most authoritative place is always the official website of the steering gear manufacturer. You can directly search for the model number printed on the side of the servo, such as " " or "SG90 Specification Book", and you can usually find the official PDF document, which not only has clear wiring definitions, but also detailed dimensions and electrical parameters. Developing the habit of checking official information is more effective than asking ten people, and it can also give you a more thorough understanding of this component.
Now, let’s choose the most common SG90 servo and go through the entire process as an example. First of all, be sure to cut off the power first! Before performing any wiring work, make sure the power supply is disconnected. Next, check the pin definition of the servo and confirm that the pins of your SG90 servo are arranged in the order of brown, red and orange. Then, use Dupont wires to make connections: connect the brown wire to the GND pin of the development board, the red wire to the 5V pin, and the orange wire to a digital pin, such as pin 9. After the connection is completed, check it carefully to make sure there are no wrong pins. Finally, turn on the power and upload a simple servo test program. If the servo can rotate normally, congratulations, you have successfully completed the entire connection and testing process! The core point of the entire operation process is to "cut off the power first, then connect the wiring, check again and again, and finally turn on the power."
In practice, every step is crucial. The purpose of cutting off the power first is to ensure safety and prevent short circuits and other problems caused by accidental power on during the wiring process. Viewing the pin definitions allows us to accurately know the function and corresponding color of each pin, so that we can connect it correctly. Be careful when connecting with Dupont wire to make sure the connection is firm and correct. Checking the pins is even more critical, as even a small mistake may cause the servo to not work properly. Finally, power on and upload the test program, and verify whether the entire connection is successful by turning the servo. This series of steps are closely connected and interlocking. Only by strictly following the process can we successfully complete the connection and testing of the SG90 servo and achieve the expected functions.
Even if you are careful, you will inevitably run into problems. For example, if the servo does not move, first check whether the power supply is sufficient. Many problems are caused by insufficient voltage. If the servo shakes or the position is inaccurate, it may be that the signal line is not in good contact, or the pulse width in the program is not set correctly. There is also a situation where the servo is stuck and still gets hot. This is usually because the mechanical structure is stuck or overloaded, and you need to cut off the power quickly for inspection. Remember, don’t panic when you encounter problems. Check them one by one in the order of "power supply - signal - program". Most faults can be solved.
If you feel that simple wiring and rotation are no longer enough for you, and want to use servos to make cooler products, such as robotic arms or bipedal robots, then you need to learn more systematically. At this time, you might as well go to some professional solution companies or technical communities. For example, you can search for "Tiangong Measurement and Control" or "". In addition to product introductions, their official website often has very detailed application notes and reference designs. There are ready-made cases for reference from selection to circuit design, which can help you avoid many research and development pitfalls and make your product innovation path smoother.
After seeing this, do you know a lot about servo wiring? I want to ask you, what is the most troublesome problem you encounter when tinkering with the steering gear yourself? Welcome to leave a message in the comment area, let’s communicate and discuss together, and don’t forget to give it a like and share it with friends who are also playing with electronics!
Update Time：2026-03-14
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