arduino開發ESP8266學習筆記四—–舵機

使用時發現會有ESP8266掉電的情況，應該是板上的穩壓芯片的限流導致的，觀測波形，發現當舵機運轉時，電源線3.3V不再是穩定的3.3V，大概是在3.0V到3.3V范圍內高頻振動，這應該是ESP8266掉電的原因，可以將舵機電源連接到另一個電源上。當舵機使用外部電源的時候，一定要將舵機的電源地和ESP8266的地要連接在一起，這樣，才可以正常工作。

這次使用了Servo.h的頭文件，頭文件內容如下：

/*

Servo.h – Interrupt driven Servo library for Esp8266 using timers

Original Copyright (c) 2015 Michael C. Miller. All right reserved.

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

*/

// A servo is activated by creating an instance of the Servo class passing

// the desired pin to the attach() method.

// The servos are pulsed in the background using the value most recently

// written using the write() method.

//

// The methods are:

//

// Servo – Class for manipulating servo motors connected to Arduino pins.

//

// attach(pin ) – Attaches a servo motor to an i/o pin.

// attach(pin, min, max ) – Attaches to a pin setting min and max values in microseconds

// default min is 544, max is 2400

//

// write() – 設置舵機的角度? (invalid angle that is valid as pulse in microseconds is treated as microseconds)

// writeMicroseconds() – 設置舵機的脈寬為微秒級的

// read() -讀取最近一次舵機的脈寬并且轉換成0-180度

// readMicroseconds() -讀取最近一次微秒級的脈寬(was read_us() in first release)

// attached() – 如果有一個舵機引腳被設置了則返回真.

// detach() – 停止使用這個舵機引腳.

#ifndef Servo_h

#define Servo_h

#include

// the following are in us (microseconds)

//

#define MIN_PULSE_WIDTH 544 // the shortest pulse sent to a servo

#define MAX_PULSE_WIDTH 2400 // the longest pulse sent to a servo

#define DEFAULT_PULSE_WIDTH 1500 // default pulse width when servo is attached

#define REFRESH_INTERVAL 20000 // minumim time to refresh servos in microseconds

#if !defined(ESP8266)

#error “This library only supports esp8266 boards.”

#endif

class Servo

{

public:

Servo();

~Servo();

uint8_t attach(int pin); // attach the given pin to the next free channel, sets pinMode, returns channel number or 0 if failure

uint8_t attach(int pin, uint16_t min, uint16_t max); // as above but also sets min and max values for writes.

void detach();

void write(int value); // if value is < 200 its treated as an angle, otherwise as pulse width in microseconds

void writeMicroseconds(int value); // Write pulse width in microseconds

int read(); // returns current pulse width as an angle between 0 and 180 degrees

int readMicroseconds(); // returns current pulse width in microseconds for this servo (was read_us() in first release)

bool attached(); // return true if this servo is attached, otherwise false

private:

bool _attached;

uint8_t _pin;

uint16_t _minUs;

uint16_t _maxUs;

uint16_t _valueUs;

};

#endif

代碼部分：

#include

Servo myservo;//應該和c語言的結構體類似

int? _servo=15;

void setup()

{

myservo.attach(_servo);//設置舵機的引腳

myservo.write(0);//默認輸出為0度

}

void loop()

{

for(int i=0;i<180;i++)

{

myservo.write(i);//舵機轉線i度的地方

delay(500);

}

for(int i=180;i>0;i–)

{

myservo.write(i);

delay(50);

}

}

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