Easy Arduino Project: Control a Servo with a Pushbutton 180 degree to 0 and back
Introduction
This article explains a simple Arduino project that uses a pushbutton to control a servo motor. A servo motor is a precise motor that can rotate to a specific position, making it ideal for applications like robotics and automation. This project will make a servo move from 0 to 180 degrees when a button is pressed and return to 0 when released.
Project Components and Wiring
You will need an Arduino board, a servo motor, and a pushbutton.
Wiring Instructions:
- Servo Motor: Connect the signal wire (usually yellow/orange) to Arduino pin 3, the power wire (red) to 5V, and the ground wire (black/brown) to GND.
- Pushbutton: Connect one leg to digital pin 2 and the other leg to a GND pin. That's it! By using the Arduino's internal pull-up resistor, you do not need an external resistor.
The Code Explained
The program is broken down into three main parts: the pin definitions, the setup() function, and the loop() function.
Pin Definitions
This section sets up the required libraries and assigns meaningful names to the pins you're using.
#include <Servo.h>
const int servoPin = 3;
const int buttonPin = 2;
Servo myServo;The setup() Function
The setup() function contains code that runs only once when the Arduino board is powered on or reset. It's used for initial configuration.
void setup() {
myServo.attach(servoPin);
pinMode(buttonPin, INPUT_PULLUP);
myServo.write(0);
}The crucial change is pinMode(buttonPin, INPUT_PULLUP);. This activates an internal resistor that pulls the pin's voltage to HIGH. When you press the button, it connects the pin to ground, and the voltage drops to LOW.
The loop() Function
The loop() function contains the main program logic and runs repeatedly forever after the setup() function is finished.
void loop() {
int buttonState = digitalRead(buttonPin);
if (buttonState == LOW) {
myServo.write(180);
} else {
myServo.write(0);
}
}The logic here is now reversed. Since the button press results in a LOW signal, the if (buttonState == LOW) condition is used to move the servo to 180 degrees.
图像
#include <Servo.h>
/*
* 这是控制伺服电机的草图。当按下按钮时，伺服电机移动到180度并保持在那里。当释放按钮时，伺服电机返回到0度。
*/
// 为伺服电机定义引脚
const int servoPin = 3;
// 定义按钮的引脚
const int buttonPin = 2;
// 创建一个伺服对象
Servo myServo;
void setup() {
// 将伺服对象连接到伺服针脚
myServo.attach(servoPin);
// 将按钮引脚设置为输入模式
pinMode(buttonPin, INPUT);
// 将伺服电机启动到0度
myServo.write(0);
}
void loop() {
// 读取按钮的状态
int buttonState = digitalRead(buttonPin);
// 如果按钮被按下（高电平）
if (buttonState == HIGH) {
// 将舵机移动到180度
myServo.write(180);
} else {
// 如果按钮被释放（低电平），将伺服电机移动回0度。
myServo.write(0);
}
}
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