คือผมจะควมคุม node mcu ผ่าน vb อะครับ มี2โหมด คือโหมดเซฟลายนิ้วมือ กับโหมดสแกนลายนิ้วมือแล้วส่งขึ้นฐานข้อมูล ปกติเปิดขึ้นมาจะเป็นโหมดสแกน แต่ถ้าป้อน b เข้าไป จะเข้าโหมดเซฟลายนิ้วมือ และพอป้อน a เข้าไปจะกลับมา โหมด สแกนลายนิ้วมืออีครั้ง แต่มันไม่กลับมาโหมดสแกนอะครับ ช่วยดูโค้ดให้หน่อยครับ ว่าต้องทำอย่างไร เหมือนมันติดที่ while ไม่รู้จะแก้ไขอย่างไร ลองแล้วก็ไม่ได้
ปล. ผมยังไม่ได้ใช้ vbทดสอบนะครับ เพราะ แค่ป้อนผ่าน serial monitor ยังไม่ผ่านเลย สลับไปเซฟได้ แต่สลับให้กลับมาสแกนไม่ได้
ขอบคุณครับ
//////////////////////////////////////////////////////////////โค้ดครับ////////////////////////////////////////////////////////////////////////////////////////
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WIFIMulti.h>
#include <ESP8266HTTPClient.h>
ESP8266WiFiMulti WiFiMulti;
#include <Adafruit_Fingerprint.h>
#include <SoftwareSerial.h>
SoftwareSerial mySerial(D2, D3);
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);
uint8_t id;
int FID;
int ID =0;
char key ='a';
void setup() {
Serial.begin(9600);
  while (!Serial);
  finger.begin(57600);
  for (uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] WAIT %d...\n", t);
Serial.flush();
delay(1000);
}
  if (finger.verifyPassword()) {
    Serial.println("Found fingerprint sensor!");
  } else {
    Serial.println("Did not find fingerprint sensor ");
    while (1) { delay(1); }
  }
  WiFiMulti.addAP("AndroidAP611F", "hkcc8422"); // ssid , password
randomSeed(50);
}

void loop()
{
if(Serial.available())
  {key =Serial.read();
  }
  if(key == 'a')//ป้อน a จะทำงานในฟังชั่น สแกน
  {scan();
  }
  if (key =='b')//ป้อน b จะทำงานในฟังชั่น เซฟ
  {save();
    }

}
/*..........................................................................*/
void scan()
{
    getFingerprintIDez();
if ((WiFiMulti.run() == WL_CONNECTED)) {
HTTPClient http;
if(ID!=FID){
  ID=FID;
String url = "http://192.168.43.131/nodemcu/esp8266mysql/add.php?temp="+String(ID);
Serial.println(url);
http.begin(url); //HTTP
}
int httpCode = http.GET();
if (httpCode > 0) {
Serial.printf("[HTTP] GET... code: %d\n", httpCode);
if (httpCode == HTTP_CODE_OK) {
String payload = http.getString();
Serial.println(payload);
}
} else {
//Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
}
http.end();
}
delay(3000);
  }
  /*..............................................................................*/
void save()
{
    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() );
  }

  /*......................SCAN.........................................................*/
  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;
  Serial.print("Found ID #"); Serial.print(finger.fingerID);
   FID=finger.fingerID;
  Serial.print(" with confidence of "); Serial.println(finger.confidence);
  return finger.fingerID;}
  /*......................SCAN.........................................................*/

  /*...................SAVE...............................................................*/
  uint8_t readnumber(void) {
  uint8_t num = 0;
  
  while (num == 0) {
    while (! Serial.available());
    num = Serial.parseInt();
  }
  return num;
}
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;
  }  
}
/*...................SAVE...............................................................*/