Arduino--AS608指纹传感器

（1）简介

如图所示为AS608指纹传感器，其可支持串口和USB通信
在这里插入图片描述
模块芯片上的管脚如下：

序号	名称	说明
1	Vi	模块电源正输入端
2	Tx	串行数据输出
3	Rx	串行数据输入
4	GND	信号地
5	WAK	感应信号输出，默认高电平有效
6	Vt	触摸感应电源输入，3.3V供电
7	U+	USB D+
8	U-	USB D-

（2）调试（完整工程代码见文末链接）

本文基于串口开发（使用UNO中软件模拟串口（2,3），节约串口资源），硬件接口如下：

AS608	UNO
Vi	5V
Tx	2
Rx	3
GND	GND
在使用指纹传感器前需要先录入指纹，操作方式如下（按上表连接接口）：


#include <Adafruit_Fingerprint.h>// On Leonardo/Micro or others with hardware serial, use those! #0 is green wire, #1 is white
// uncomment this line:
// #define mySerial Serial1// For UNO and others without hardware serial, we must use software serial...
// pin #2 is IN from sensor (GREEN wire)
// pin #3 is OUT from arduino  (WHITE wire)
// comment these two lines if using hardware serial
SoftwareSerial mySerial(2, 3); // RX,TX(UNO)
//SoftwareSerial mySerial(10, 11); // RX,TX(MEGA2560)Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);uint8_t id;void setup()  
{Serial.begin(9600);while (!Serial);  // For Yun/Leo/Micro/Zero/...delay(100);Serial.println("\n\nAdafruit Fingerprint sensor enrollment");// set the data rate for the sensor serial portfinger.begin(57600);if (finger.verifyPassword()) {Serial.println("Found fingerprint sensor!");} else {Serial.println("Did not find fingerprint sensor :(");while (1) { delay(1); }}
}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
{Serial.println("Ready to enroll a fingerprint!");Serial.println("Please type in the ID # (from 1 to 127) you want to save this finger as...");id = readnumber();if (id == 0) {// ID #0 not allowed, try again!return;}Serial.print("Enrolling ID #");Serial.println(id);while (!  getFingerprintEnroll() );
}uint8_t getFingerprintEnroll() {int p = -1;Serial.print("Waiting for valid finger to enroll as #"); Serial.println(id);while (p != FINGERPRINT_OK) {p = finger.getImage();switch (p) {case FINGERPRINT_OK:Serial.println("Image taken");break;case FINGERPRINT_NOFINGER:Serial.println(".");break;case FINGERPRINT_PACKETRECIEVEERR:Serial.println("Communication error");break;case FINGERPRINT_IMAGEFAIL:Serial.println("Imaging error");break;default:Serial.println("Unknown error");break;}}// OK success!p = finger.image2Tz(1);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;}Serial.println("Remove finger");delay(2000);p = 0;while (p != FINGERPRINT_NOFINGER) {p = finger.getImage();}Serial.print("ID "); Serial.println(id);p = -1;Serial.println("Place same finger again");while (p != FINGERPRINT_OK) {p = finger.getImage();switch (p) {case FINGERPRINT_OK:Serial.println("Image taken");break;case FINGERPRINT_NOFINGER:Serial.print(".");break;case FINGERPRINT_PACKETRECIEVEERR:Serial.println("Communication error");break;case FINGERPRINT_IMAGEFAIL:Serial.println("Imaging error");break;default:Serial.println("Unknown error");break;}}// OK success!p = finger.image2Tz(2);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!Serial.print("Creating model for #");  Serial.println(id);p = finger.createModel();if (p == FINGERPRINT_OK) {Serial.println("Prints matched!");} else if (p == FINGERPRINT_PACKETRECIEVEERR) {Serial.println("Communication error");return p;} else if (p == FINGERPRINT_ENROLLMISMATCH) {Serial.println("Fingerprints did not match");return p;} else {Serial.println("Unknown error");return p;}   Serial.print("ID "); Serial.println(id);p = finger.storeModel(id);if (p == FINGERPRINT_OK) {Serial.println("Stored!");} else if (p == FINGERPRINT_PACKETRECIEVEERR) {Serial.println("Communication error");return p;} else if (p == FINGERPRINT_BADLOCATION) {Serial.println("Could not store in that location");return p;} else if (p == FINGERPRINT_FLASHERR) {Serial.println("Error writing to flash");return p;} else {Serial.println("Unknown error");return p;}   
}

代码下载后，打开串口调试助手，显示如下，一共可以127个指纹存储
在这里插入图片描述
录入指纹需要一个一个录入，首先第一个，在发送框汇总输入“1”，然后点击发送，显示如下

这时候就需要你把手指放入传感器上录入第1个指纹，录入后如下，提示你录入完成，需要移开手指，然后再录入一次（重复确认）
在这里插入图片描述
确认后即完成录入，显示如下，这时候便表示指纹录入成功

然后关闭串口助手，重新点开，重复上面的步骤依次录入第2、3……等等指纹

录入指纹后，识别指纹过程如下：（完整代码见文末链接）

接口连线不变
重新下载如下代码

void loop()                     // run over and over again
{getFingerprintIDez();delay(50);            //don't ned to run this at full speed.
}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) {Serial.println("Communication error");return p;} else if (p == FINGERPRINT_NOTFOUND) {Serial.println("Did not find a match");return p;} else {Serial.println("Unknown error");return p;}   // found a match!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;p = finger.image2Tz();if (p != FINGERPRINT_OK)  return -1;p = finger.fingerFastSearch();if (p != FINGERPRINT_OK)  return -1;// found a match!Serial.print("Found ID #"); Serial.print(finger.fingerID); Serial.print(" with confidence of "); Serial.println(finger.confidence);return finger.fingerID; 
}