Esp8266 mqtt stepper motor remote control curtains

28BYJ-48 using a stepping motor esp8266-12f (or nodemcu) mqtt arduino IDE Based development
to control the motor by wifi module further MQTT transmission instruction, the curtains open or closed motor drive

The demo Address:
Link

Construction model

How to make electric curtains, cattle explain to you how it works
reference this video to build a model curtains
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It is important to build a model of stability, even if the motor can not control but the curtains open and closed models built are affected

To stick firmly motor
Thin ropes to choose coarse (high friction)
Soft paper cloth or curtains selected from
Pulleys must be done very carefully the impact rotation

Do I first trial demonstrated that to work when making a model curtains, made a lot of wrong doing was ugly
, but experiment a success! ! !
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Our second model is my curtains and other java big brother stay up late to do it, two engineering students to do by hand is really too tortured people ...
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Stepper motor principle

A stepping motor 28BYJ-48
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Meaning 28BYJ-48 an outer diameter of 28 mm was shot eight four-phase permanent magnet stepping motor reducer
for driving the stepping motor 28BYJ-48, the most common method is to use a ULN2003 driver board.
With the + 5V power Arduino development board method directly ULN2003 driver board power supply is short-time test, but do not supply power to the drive plate ULN2003 prolonged use of Arduino.
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A more detailed analysis of the principles link

Stepper motor control

FIG circuit wirings
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Stepper library used
to establish a stepping motor objects
define the motor control pin and basic information motor.
Motor control pin is 8,9,10,11
or more pins are sequentially connected ULN2003 driver board In1, In2, In3, In4
Create Object motor

示例代码
参考 dianji.ino 学习stepper库的使用方法
创建对象 Stepper steppermotor(STEPS_PER_ROTOR_REV, 8, 10, 9, 11);
其中的第一个参数为一次转动的步数
在这里可以设置为2048

示例代码

/*
  Arduino控制28BYJ-48步进电机测试程序
  本示例程序旨在演示如何通过Arduino控制28BYJ-48步进电机。
*/
 
//本示例程序使用Stepper库
#include 
 
// 定义电机控制用常量
 
// 电机内部输出轴旋转一周步数
const int STEPS_PER_ROTOR_REV = 32; 
 
//  减速比
const int GEAR_REDUCTION = 64;
 
/*
 * 转子旋转一周需要走32步。转子每旋转一周，电机输出轴只旋转1/64周。
 * （电机内部配有多个减速齿轮,这些齿轮会的作用是让转子每旋转一周，
 * 输出轴只旋转1/64周。）
 * 因此电机输出轴旋转一周则需要转子走32X64=2048步，即以下常量定义。
*/
 
// 电机外部输出轴旋转一周步数 （2048）
const float STEPS_PER_OUT_REV = STEPS_PER_ROTOR_REV * GEAR_REDUCTION;
 
// 定义电机控制用变量
 
// 电机旋转步数
int StepsRequired;
 
// 建立步进电机对象
// 定义电机控制引脚以及电机基本信息。
// 电机控制引脚为 8,9,10,11 
// 以上引脚依次连接在ULN2003 驱动板 In1, In2, In3, In4 
 
Stepper steppermotor(STEPS_PER_ROTOR_REV, 8, 10, 9, 11); 
 
void setup()
{
//setup函数内无内容
}
 
void loop()
{
  // 极慢转动4步用于观察ULN2003电机驱动板LED变化
  steppermotor.setSpeed(1);    
  StepsRequired  =  4;
  steppermotor.step(StepsRequired);
  delay(1000);
 
   // 慢速顺时针旋转一圈
  StepsRequired  =  STEPS_PER_OUT_REV; 
  steppermotor.setSpeed(500);   
  steppermotor.step(StepsRequired);
  delay(1000);
  
  // 快速逆时针旋转一圈
  StepsRequired  =  - STEPS_PER_OUT_REV;   
  steppermotor.setSpeed(800);  
  steppermotor.step(StepsRequired);
  delay(2000);
 
}