STEM教育 · 用电磁锁做一个指纹锁

入手DF商城的指纹传感器和阿里套件的电磁锁有段时间了，一直没有动过，所以这次把这两样东西放在一起玩玩！
【展示视频】

【展示效果】
用电磁锁做一个指纹锁图2

【作品器材】
      DFRduino UNO R3                1
      IO 传感器扩展板 V7.1             1
      指纹识别传感器                      1
      电磁锁                                     1
      数字继电器模块                      1
      I2C LCD1602液晶模块(兼容Arduino Gadgeteer)    1
      M3*30扁头内六角螺丝 10套    1
【制作过程】

      1.3D建模盒子结构件
用电磁锁做一个指纹锁图4

3D打印模型

3D打印盒子结构件

3D打印盒子盖

3D打印盒子
（新模型盒盖和盖轴是连在一起的）

器材安装
用电磁锁做一个指纹锁图8

拿出电磁锁和三根M3的螺丝
用电磁锁做一个指纹锁图9

将电磁锁安装盒壁的侧面
用电磁锁做一个指纹锁图10

拿出指纹传感器从盒子内部由里到外穿出指纹传感器，使其卡在指纹传感器的卡缝处。用热熔胶枪从盒子内部打胶固定指纹传感器。
用电磁锁做一个指纹锁图15

用AB胶水固定在盖板上，用30mm的m3螺丝固定转轴。
用电磁锁做一个指纹锁图11

再将LCD屏固定在对应的孔位上。

把主控器等电子元器件放入盒子内部。

电路连线图：
用电磁锁做一个指纹锁图20

代码编写：
[mw_shl_code=cpp,true]
#include <Arduino.h>
#include <SoftwareSerial.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x20,16,2);  // set the LCD address to 0x20 for a 16 chars and 2 line display

#include <Adafruit_Fingerprint.h>

SoftwareSerial mySerial(2, 3);

Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

void setup()
{ lcd.init();                   // initialize the lcd
  lcd.home();
  lcd.print("door use finger");
  lcd.setCursor(0, 1);
  lcd.print("nsfzsz_cj");
  Serial.begin(9600);

  while (!Serial);  // For Yun/Leo/Micro/Zero/
  delay(100);
  Serial.println("\n\nAdafruit finger detect test");

  // set the data rate for the sensor serial port
  finger.begin(57600);
  pinMode(4, OUTPUT);
  pinMode(6, INPUT_PULLUP);       //Set Pin6 as output
  if (finger.verifyPassword()) {
Serial.println("Found fingerprint sensor!");
  }
  else {
Serial.println("Did not find fingerprint sensor :(");
while (1) { delay(1); }
  }

  finger.getTemplateCount();
  Serial.print("Sensor contains "); Serial.print(finger.templateCount); Serial.println(" templates");
  Serial.println("Waiting for valid finger...");

}

uint8_t readnumber(void) {
  uint8_t num = 0;

  while (num == 0) {
while (! Serial.available());
num = Serial.parseInt();
  }
  return num;
}
void loop()                   // run over and over again
{
  getFingerprintIDez();
delay(50);          //don't ned to run this at full speed.
//lcd.print("read your finger");


}

uint8_t getFingerprintID() {
  uint8_t p = finger.getImage();
  switch (p) {
case FINGERPRINT_OK:
   Serial.println("Image taken");
   break;
case FINGERPRINT_NOFINGER:
   Serial.println("No finger detected");
   return p;
case FINGERPRINT_PACKETRECIEVEERR:
   Serial.println("Communication error");
   return p;
case FINGERPRINT_IMAGEFAIL:
   Serial.println("Imaging error");
   return p;
default:
   Serial.println("Unknown error");
   return p;
  }

  // OK success!

  p = finger.image2Tz();
  switch (p) {
case FINGERPRINT_OK:
   Serial.println("Image converted");
   break;
case FINGERPRINT_IMAGEMESS:
   Serial.println("Image too messy");
   return p;
case FINGERPRINT_PACKETRECIEVEERR:
   Serial.println("Communication error");
   return p;
case FINGERPRINT_FEATUREFAIL:
   Serial.println("Could not find fingerprint features");
   return p;
case FINGERPRINT_INVALIDIMAGE:
   Serial.println("Could not find fingerprint features");
   return p;
default:
   Serial.println("Unknown error");
   return p;
  }

  // OK converted!
  p = finger.fingerFastSearch();
  if (p == FINGERPRINT_OK) {

Serial.println("Found a print match!");
  } else if (p == FINGERPRINT_PACKETRECIEVEERR) {
// digitalWrite(12,LOW);
Serial.println("Communication error");
return p;
  } else if (p == FINGERPRINT_NOTFOUND) {
//digitalWrite(12,LOW);
Serial.println("Did not find a match");
return p;
  } else {
//digitalWrite(12,LOW);
Serial.println("Unknown error");
return p;
  }

  // found a match!
// digitalWrite(12,HIGH);
  Serial.print("Found ID #"); Serial.print(finger.fingerID);
  Serial.print(" with confidence of "); Serial.println(finger.confidence);
  return finger.fingerID;
}

// returns -1 if failed, otherwise returns ID #
int getFingerprintIDez() {
  uint8_t p = finger.getImage();
  if (p != FINGERPRINT_OK)  return -1;
  lcd.clear();
  lcd.print("you no master");
  p = finger.image2Tz();
  if (p != FINGERPRINT_OK) return -1;
  lcd.clear();
  lcd.print("you no master");
  p = finger.fingerFastSearch();
  if (p != FINGERPRINT_OK)  return -1;

// found a match!

  lcd.clear();
  lcd.print("Found ID #");
  lcd.print(finger.fingerID);
  lcd.setCursor(0, 1);
  lcd.print("come in master");
  //lcd.print(finger.confidence);
  digitalWrite(4,HIGH);
  delay(5000);
  digitalWrite(4,LOW);
  lcd.clear();
  //Serial.print("Found ID #");
// Serial.print(finger.fingerID);
  //Serial.print(" with confidence of "); Serial.println(finger.confidence);
  return finger.fingerID;
  }[/mw_shl_code]

测试效果：
整体效果用电磁锁做一个指纹锁图16