How To Connect The Servo Controller Interface? Understand Power, Signal And Ground Wires With One Picture

When you were starting to develop aservocontroller, have you ever felt at a loss when looking at the rows of pins? The colors of the power, signal, and ground wires are actually different. Once one of them is connected incorrectly, theservowill become motionless at best, or even smoke at worst. Don't worry, in fact, this thing is not as mysterious as you think. Let's sort out the interface aspects clearly and clearly today. In this way, you can connect it accurately even with your eyes closed.

What are the common types of steering gear controller interfaces?

There are many types of steering gear controller interfaces on the market, but if you look closely, you will find that they all have the same roots. Among them, the most common one is the three-pin header. The spacing is usually set to 2.54 mm. When using, you can directly plug in the Dupont wire orservowire, which is relatively easy to operate.

There is also a more professional terminal interface. You need to use a screwdriver to tighten the wires when connecting. This connection method is stronger and is therefore suitable for use on robots or industrial equipment. It can effectively avoid loosening of wires due to equipment vibration.

Some high-end controllers use network ports or HDMI ports to transmit multi-channel servo signals. This method has strong anti-interference ability and can control dozens of servos at the same time. But the most common thing we use when getting started is the standard three-pin interface. Remembering its arrangement is more important than remembering the appearance of the interface.

Which of the three wires is the power supply and which is the signal?

Many novices burn out their servos during operation. The reason is often that the power and signal cables are reversed. The servo has three wires, and these three wires are clearly distinguished. Among them, the middle wire is always red. It is used to connect the positive pole of the power supply. The power supply voltage is generally 5V or 6V. The wires on both sides are usually brown or black in color. These two wires represent the negative electrode and are also called ground wires. As for the remaining wire, the color may be orange, yellow or white, it is the signal wire.

The wiring connection of the servo is very important. Once it is connected incorrectly, it will easily cause the problem of burning the servo. Beginners must keep in mind the characteristics and connections of these lines. The red wire in the middle is connected to the positive pole of the power supply, the brown or black wires on both sides are the negative pole or ground wire, and the orange, yellow or white wire is the signal wire. Only by connecting accurately can the normal operation of the servo be ensured and avoid the failure of the servo burning due to reverse wiring.

You can think of this interface as a cozy family of three. Among them, the power supply is like a mother, continuously providing energy and laying the foundation for the normal operation of the entire system; the ground wire is like a father, firmly serving as a basic support to ensure the stability and safety of the system; and the signal line is like a child, specifically responsible for transmitting instructions so that various information can be accurately conveyed. Before performing wiring operations, be sure to develop good habits. First, find the positive and negative pole marks clearly marked on the controller. Do not guess based on color alone, because the colors of some fake wires are marked randomly, which can easily lead to wiring errors.

How to quickly determine the servo line sequence definition

When you are unsure of the line sequence, do not turn on the power for testing, because it is extremely easy to burn out the servo. The most reliable way is to check the label on the servo itself. Regular servos usually have clearly marked lines of different colors corresponding to which functions.

If the label on the servo is worn and disappears, you can use a multimeter to measure it. Specifically, there should be a resistance between the red wire and the black wire, while the resistance between the signal wire and the other two legs should be infinite.

Another practical tip is to borrow a servo tester from an experienced aircraft model player around you, plug it in and turn it around to see if the line sequence is correct. Remember, the common standard arrangement is that the signal lines are on either side and the power supply is in the middle. This is the default setting of most manufacturers.

What will be the consequences if the steering gear controller is connected incorrectly?

I have experienced this situation more than once. The mildest case is that the servo just makes a buzzing sound but does not rotate. Once this happens, cut off the power quickly and the equipment can still be saved.

What is more serious is that the power supply and ground are connected reversely. In this case, the circuit board inside the servo will be burned out in an instant, followed by a puff of smoke, the servo will be scrapped directly, and even the corresponding interface of the controller may be damaged.

What's even more confusing is that when the signal line is connected to the power supply, the servo will keep turning in one direction until it gets stuck and heats up. After a long time, the motor inside the servo will burn out. Therefore, the wiring must be stable, and the wiring must be checked before powering on. This habit can save a lot of money.

How to wire multiple servos in parallel for the most stability

When controlling several servos at the same time, especially for large-scale projects such as robotic arms or bionic robots, power supply becomes a big problem. Directly twist the power cords of all the servos together and connect them to the controller. If the current is large, the lines will heat up and the voltage will be pulled down, causing the servos to become weak or vibrate.

The correct approach is to supply power to the servos separately, use a high-current regulated power supply, and distribute power to each servo through a distribution board. The power supply of the controller and the servo power supply only need to be grounded to the same ground, that is, connect all the negative poles together, so that the signal transmission is stable, the power is sufficient, and the servo motor can move powerfully.

How to solve the interference of steering gear signal line

The most obvious manifestation of signal interference is that the servo will vibrate on its own, and it will twitch even though there is no command given. This situation is most likely caused by an unclean power supply, or the signal line is too close to a high-current wire. Separating the servo power supply and the control circuit power supply and adding a large capacitor filter can solve most jitter problems.

If the signal wire is relatively long, more than 30 centimeters, it is best to use a shielded wire, or twist the signal wire like a network cable, which can greatly reduce interference. Also, the ground wire must be thick enough, and the grounds of all devices must be connected together to form a common reference point so that signal transmission will not jump randomly.

Seeing this, you should be aware of the wiring of the servo. Have you ever been fooled by servo wiring when working on a project? Or do you have any unique secrets? Welcome to share it in the comment area so that more people can avoid pitfalls. If you find it useful, don’t forget to like it and forward it to your friends who play servos around you!