TECHNICAL SUPPORT
Published 2026-03-17
Are you also in a dilemma, undecided whether to choose themicroservotower pro mg90s servo? Whenever I browse Taobao, I see all kinds ofservos of various models, such as SG90, etc., which makes people dizzy. Especially when making a project, once you choose the wrong servo, you will be in trouble. Not only will you waste money, but it may even cause the entire project to fail.
Today, we will specifically talk about this MG90S servo and explore in depth whether it is worth buying.
MG90S can be said to be an evergreen tree in the steering gear industry. It is produced by Tower Pro, an old steering gear manufacturer, and is an upgraded version of the classic SG90. The biggest change is to replace the plastic gears with metal gears, which greatly improves its durability.
In actual use, the response speed and positioning accuracy of the MG90S are quite satisfactory. I have used it when making a small robotic arm. The rotation is very smooth and there is no lag like some cheap servos. Although the price is a few dollars more than the SG90, considering the durability, the price difference is still well worth it.
Speaking of torque, MG90S can provide 1.8kg·cm of torque at 4.8V and 2.2kg·cm at 6V. You may not have much idea of this data. Simply put, it can easily lift a can filled with water, or drive the joints of a small robotic arm.
But it also depends on the specific use. It's perfectly adequate for steering a toy-level car, but if you want it to drive a heavy robotic arm, it's a bit difficult. When I was making a six-legged robot, I discovered that it would take a big thing to support the entire leg. Therefore, before choosing a servo, it is best to estimate how heavy your load will be.
I struggled with this issue for a long time. The SG90 uses nylon plastic gears, which are cheap but prone to tooth scanning, especially when impacted. The MG90S uses metal gears, which is extremely durable. I have used the robotic arm for more than a year, and the gears are still intact.
But that doesn’t mean that the SG90 is useless. If you are just doing a simple project to test your idea, or the force on the servo is very small, the SG90 is completely sufficient, and you can save a few dollars to buy milk tea. However, if it is a work that will be used for a long time, or the servo will be under certain pressure, MG90S is definitely a safer choice.
There are three wires on the back of MG90S, brown is the ground wire, red is the power wire, and orange is the signal wire. The connection is very simple, just connect the red to 5V, the brown to GND, and the orange to any PWM pin. Remember that the power supply must be sufficient, because the current when the servo is started is not small.
In terms of control, PWM signals are used. Simply put, the principle is to use different pulse widths to prompt the steering gear to rotate to different angles. Specifically, a pulse of 0.5ms corresponds to 0 degrees, a pulse of 1.5ms corresponds to 90 degrees, and a pulse of 2.5ms corresponds to 180 degrees. The Servo library used can be easily implemented with just a few lines of code. There is no need to calculate these numbers yourself, which is extremely convenient.
This approach greatly simplifies the operation process and reduces the possibility of errors. By using ready-made library functions, users can devote more energy to other critical parts of the project. Without tedious calculations, you can directly use the convenient functions provided by the library function to accurately control the angle of the steering gear, which brings great convenience to the development and implementation of related projects, making the entire process more efficient and easier to manage.
To be honest, there are so many fake MG90S products on the market that it’s a headache. The packaging box of the genuine Tower Pro is clearly printed, has anti-counterfeiting labels, and the fonts on the servo are also very neat. The most reliable way to identify is to look at the gears. Genuine metal gears are finely processed and rotate without noise.
I recommend going to the Tower Pro official website to check for authorized dealers, or choose those old stores with good reputations. Don't be greedy for cheap and buy those "value packs" that cost more than ten yuan. Most of them are refurbished products or fake ones with plastic gears. I just suffered this loss. I had my teeth scanned within two days of buying it. It was not worth the loss.
The application scenarios of MG90S are actually quite wide. It can be used for small robotic arms, robot joints, rudder control of remote control models, and even camera pan/tilts on smart cars. The size is only 23x12., and the weight is 13.4 grams. It is small and lightweight, especially suitable for projects with limited space.
I have seen someone use MG90S to make an automatic feeder. They cleverly used its function to create a device that can feed food regularly and quantitatively. Some people also apply MG90S to the tail swing of bionic robotic fish, so that it can flexibly simulate the swing posture of the fish's tail and swim freely in the water. What impressed me most was a high school student who used MG90S to make a robot hand. This robot hand can accurately simulate the movement of human hands to grab objects, showing unique creativity and superb skills.
In fact, as long as you can think of scenes that require small-angle rotation, you might as well try using MG90S. It may bring you unexpected inspiration, help you create stunning works, and start a journey of exploration full of creativity and surprises.
Have you done any interesting DIY projects with the MG90S? Have you encountered any pitfalls or found any money-saving tips? Welcome to share your experience in the comment area. If you find it useful, don’t forget to give it a like and support it, so that more friends who play servos can see this article~
Update Time：2026-03-17
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