您好，我的问题是，当我将指纹传感器与 esp8266 连接时，它不起作用！我正在使用 adafruit 指纹传感器 R305 和 esp 模块 esp8266 cp2102。我已将 vcc 引脚连接到 3.3v 引脚，将接地引脚连接到 groung，然后将 rx 连接到 rx 引脚，将 tx 连接到 tx 引脚。我使用 adafruit 传感器库，但当我连接指纹时它会做任何事情。我打算用这两个组件创建一个简单的指纹考勤系统，我用 IFTTT 应用程序创建了一个数据库。有代码。
#include <BearSSLHelpers.h>
#include <CertStoreBearSSL.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiAP.h>
#include <ESP8266WiFiGeneric.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266WiFiScan.h>
#include <ESP8266WiFiSTA.h>
#include <ESP8266WiFiType.h>
#include <WiFiClient.h>
#include <WiFiClientSecure.h>
#include <WiFiClientSecureAxTLS.h>
#include <WiFiClientSecureBearSSL.h>
#include <WiFiServer.h>
#include <WiFiServerSecure.h>
#include <WiFiServerSecureAxTLS.h>
#include <WiFiServerSecureBearSSL.h>
#include <WiFiUdp.h>
#include <SoftwareSerial.h>
#include <Adafruit_Fingerprint.h>
#define rxPin 2
#define txPin 3
const char* NAME; // the name will be gievn in the code for each ID saved
const char* ID; // the ID that are save into the fingerprint sensor
String Event_Name = "FINGERPRINT "; // this is the name of the file of the database
String Key = "beStaVRpfye6wtonedU"; // this is my unique key for the database created
// Replace with your unique IFTTT URL resource
String resource = "/trigger/" + Event_Name + "/with/key/" + Key;
// Maker Webhooks IFTTT
const char* server = "maker.ifttt.com"; // here database is store
// Replace with your SSID and Password
char* ssid = "Telecom-2"; //wifi name
char* pass = "X5NVY53V236k"; // wifi password
SoftwareSerial mySerial (rxPin, txPin);
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial); // communcation with the IoT and fingerprint sensor
void setup()
{
Serial.begin(57600);
mySerial.begin(57600);
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);
delay(5);
if (finger.verifyPassword()) {
Serial.println("Found fingerprint sensor!");
} else {
Serial.println("Did not find fingerprint sensor :(");
while (1) {
delay(1);
}
}
// the fingerpprint sensor will first starts
finger.getTemplateCount();
Serial.print("Sensor contains ");
Serial.print(finger.templateCount);
Serial.println(" templates");
Serial.println("Waiting for valid finger...");
// meanwhile the esp8266 wifi module will start and conect to the wifi data given
Serial.print("Connecting to: "); // connecting to a wifi avaible
Serial.print(ssid); // connecting to the given wifi name
WiFi.begin(ssid, pass); // connection in progress
int timeout = 10 * 4; // 10 seconds
while (WiFi.status() != WL_CONNECTED && (timeout-- > 0)) {
delay(250);
Serial.print("Attempting to connect to SSID");
}
Serial.println("Connected");
if (WiFi.status() != WL_CONNECTED) {
Serial.println("Failed to connect");
}
Serial.print("WiFi connected in: ");
Serial.print(millis());
Serial.print(", IP address: ");
Serial.println(WiFi.localIP());
}
void loop() // run over and over again
{ // now the finger print sensor will wait for a register ID
getFingerprintIDez();
if (finger.fingerID == 1) //mean if the ID correspond to ID 1
{
Serial.print("!!--");
Serial.println(finger.fingerID);
NAME = "Sailen"; //therefore the name of sailen will appear as ID 1
ID = "1";
if (finger.confidence >= 60) // fingerprint test must over 60% of confidence
{
Serial.print("Attendace Marked for ");
Serial.println(NAME);
makeIFTTTRequest();
// digital write - open the attendance
}
}
if (finger.fingerID == 2 ) {
Serial.print("!!--");
Serial.println(finger.fingerID);
digitalWrite(5, LOW);
NAME = "Bob"; // therefore the name of bob will appear for ID 2
ID = "2";
if (finger.confidence >= 60) // fingerprint test must over 60% of confidence
{
Serial.print("Attendace Marked for ");
Serial.println(NAME);
makeIFTTTRequest();
// digital write - open the door
} //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;
}
// Make an HTTP request to the IFTTT web service
void makeIFTTTRequest() {
Serial.print("Connecting to "); // means connecting to my google database
Serial.print(server);
WiFiClient client;
int retries = 5;
while (!!!client.connect(server, 80) && (retries-- > 0)) {
Serial.print(".");
}
Serial.println();
if (!!!client.connected()) {
Serial.println("Failed to connect...");
}
Serial.print("Request resource: ");
Serial.println(resource);
// now that the IoT has access to the data base
// value 1 will be use for name and value 2 for which ID it is
String jsonObject = String("{\"value1\":\"") + NAME + "\",\"value2\":\"" + ID
+ "\"}"; // name and id is registered in the database
client.println(String("POST ") + resource + " HTTP/1.1");
client.println(String("Host: ") + server);
client.println("Connection: close\r\nContent-Type: application/json");
client.print("Content-Length: ");
client.println(jsonObject.length());
client.println();
client.println(jsonObject);
int timeout = 5 * 10; // 5 seconds
while (!!!client.available() && (timeout-- > 0)) {
delay(100);
}
if (!!!client.available()) {
Serial.println("No response...");
}
while (client.available()) {
Serial.write(client.read());
}
Serial.println("\nclosing connection");
client.stop();
}`
有什么不对？我在 youtube 上观看了这样的视频，但我的有点不同 https://techiesms.com/iot-projects/iot-attendance-system-without-website/