微舵机 SG90 参考资料

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SG90 - Tower-Pro

How to use a Micro Servo Motor

The micro servo motor (0.12s / 1.2kg-cm - 9g SG90) is a small motor which turns up to 180 degrees or ranges between 90, 180, or 270 degrees depending on the make or type, but never 360.

How it works

The Servo motor is an electromechanical device that rotates and changes movement based on the supplied current and voltage. The Servo works as a closed loop system that provides torque and velocity as commanded from its controller. This allows the servo to receive feedback to know when to close the loop. When connected to a programmable circuit board, this device uses the Pulse Width Modulation pins.

Wiring

Red Wire: connected to 5V

Black Wire: connected to ground

Brown Wire: connect to a PWM pin (#~)

Parts

Micro Servo (0.12s / 1.2kg-cm - 9g SG90)

Trimpot 10K with Knob (Potentiometer)

Arduino Uno R3

BreadBoard

Jumper wires

Arduino IDE

Wiring Guide

Connect the voltage and ground wires to the appropriate connection to the Servo

Connect the signal wire of the Servo to a PWM pin in the digital input pin section of the Arduino board

Connect the terminal pins of the potentiometer to voltage and ground

Connect the wiper pin of the potentiometer to an analog pin

Follow the code provided and observe how the servo rotates as you change the values of the potentiometer

Programming

The following code demonstrates how you can move the servo motor by mapping the potentiometer. If you want to skip the steps, you can jump to the Full Code.

Step 1: Create variables for the sensors pin and a variable to store the data that is collected

Step 2: Set up serial communication, set the sensor pin as an INPUT.

Step 3: Read the data from the sensor, and convert the data into a volts measurement

Step 4: Now convert the volts measurement into distance, a measurement we understand. This calculation is found in the datasheet gragh of the component and can be found here!

Step 5: Finally use the distance we calculated and display ONLY when the distance is less than or equal to its max limit.

Full Code

Output

Serial Monitor will display distance that is measure from the proximity sensor, only if the distance measure is less than or equal to the max limit which is 30cm for this exact component.

📎 参考文章

Micro Servo | Learn at CAROBOT