A Minimalist Operation Guide That Even A Novice Can Understand In Seconds, How To Turn The Steering Gear Forward And Reverse In Three Steps

When engaged in product innovation, have you ever encountered a situation where theservois "disobedient"? You obviously want it to turn left, but it runs to the right instead, or it turns in the completely opposite direction than you expected. Don't worry, this little trouble in debugging can actually be easily solved with only three simple steps. Today we will talk about how to use the most intuitive method to quickly reverse the direction of theservo.

What hardware is needed for steering gear to rotate forward and reverse?

If you want to make theservoobedient, you must first get everything ready. There are actually threecore hardware: a standard servo (such as SG90 or other commonly used ones), a control board that can send commands to it (such as ESP32), and the power supply that powers them.Don’t underestimate the power supply. Many problems with poor steering are caused by insufficient power supply. Especially for metal servos with high torque, a special power module must be used. The USB power supply on the control board alone cannot move it.

The method of connectionis also critical. You have to connect the three servo wires—power wire (red), ground wire (brown or black), and signal wire (orange or yellow)—to the control board correctly.The safest wayis to first read the instructions on the servo label. The signal line must be plugged into a pin that supports PWM (Pulse Width Modulation) output. Only by laying a solid foundation for the hardware will the subsequent operations be smooth.

How to wire the steering gear forward and reverse

The wiring method directly affects the complexity of your subsequent programming.The most worry-free wayis to connect the signal line to the numbered PWM dedicated pin on the control board, such as pin 9. The power wire (VCC) should be connected to the 5V output terminal, and the ground wire (GND) should be connected to the ground wire of the control board. With this connection, you can directly call the corresponding pin number when writing code, and the logic is very clear.

If your servo needs to be installed reversely, such as symmetrically arranged left and right in the robot arm, thephysical wiring will need to be adjusted. Some high-end servos support "reverse phase" mode. You can directly modify the default direction in its own setting software without changing the code. But for most ordinary servos, we still have to control its rotation direction through programming. This depends on the next step of code to send forward and reverse commands.

How to write the forward and reverse code of the steering gear

For most novices, writing code to control forward and reverse is not as difficult as imagined.The simplest entry codeis to introduce the Servo library at the beginning of the program, then define a servo object, and use.(9)in the setup() function to associate the pin number you just wired. Then in the loop() loop, use.write(0)to make it go to one limit position, and use.write(180)to make it go to another limit position. These two values are the "commands" that control forward and reverse rotation.

To make it go back and forth automatically, you canadd a little time delay. For example, after turning the servo to 0 degrees, usedelay(1000)to let it stop for one second, then let it turn to 180 degrees, and then let it stop for one second. By changing the value inwrite(), you can precisely control which angle it turns to.Remember, each value between 0 and 180 degrees corresponds to a specific angular position, which is more intuitive than you think.

How to adjust the steering gear in the wrong direction

If after connecting the wires and writing the code, you find that the direction of the servo rotation is completely reversed. For example, if you write 0 degrees but it turns to the 180-degree position, don't panic.The fastest wayis to exchange the values in the code. Change the place where 0 degrees was written to 180 degrees, and change the place where 180 degrees was written to 0 degrees. This "reverse assignment" method can immediately correct direction errors, which is especially suitable when you are doing rapid prototype testing.

If it is still wrong after changing the code, then you need to considerthe physical installation angle. Sometimes the initial installation angle of the servo is 90 degrees, and if you directly turn it to 0 degrees, it may be physically stuck. In this case, you can add an initialization step at the beginning of the program, first turn the servo to the 90-degree neutral position, and then perform a forward and reverse rotation cycle. At the same time, check whether the signal line is in good contact. Sometimes a virtual connection can cause the control instructions to be misinterpreted.

In what creative ways can forward and reverse steering gears be used?

Once you have figured out the forward and reverse, the door to creativity in your hand will be officially opened.The simplest applicationis to make an automatic opening and closing device, such as the lid of a smart trash can. Let the servo rotate forward 90 degrees to open the lid and reverse it 90 degrees to close the lid. To make it more advanced, you can install it on the steering mechanism of a toy car and control the angle of the steering gear through the remote control to achieve precise left and right turns.

For those who want to innovate products, the forward and reverse rotation of the steering gear is simplythe "joint" of the mechanical structure. You can use it to make an automatic feeder, let the servo rotate forward to push open the feed outlet, and then reverse to close it after a delay. Or make an automatic flower watering system and press the water pump switch by turning the steering gear forward and reverse. As long as you can think of a scene that requires "reciprocating motion", the forward and reverse rotation of the servo can help you turn your idea into reality.

What should I do if the servo is stuck when debugging forward and reverse rotation?

When debugging, if the servo "trembles" or cannot turn, it is usually not a code problem, butmechanical resistance or insufficient power supply. You can first gently turn the rocker arm of the servo with your hands to feel if there is any obvious physical jamming. If the load connected is very heavy, you need to confirm whether the torque of the servo is sufficient. For large loads, a metal servo with a torque of 25kg or higher must be used.

Another commoncause of lagis that the program moves too quickly. If you continuously make the servo jump from one angle to another in loop(), it may "crash" because it cannot react.A safe approachis to add a slow transition, or use a loop to change the angle bit by bit. For example, useforloop to slowly increase the angle from 0 to 180. In this way, the servo will rotate very smoothly and there will be no lag.

After reading these three simple steps, are you already eager to turn on the steering wheel? Don't hesitate, open your control panel now, face the wiring and codes we just talked about, and try to make it rotate forward and reverse with your own hands. If you encounter any interesting problems during the debugging process, or make any interesting creative works, please share them in the comment area, let us discuss together and turn product innovation ideas into reality!