Photon with fingerprint scanner and servo

dsn101 · November 16, 2018, 6:08am

Hi
I’m currently doing a project for my class, and I’m using an Arduino UNO with a jm-101 sensor for scanning fingerprints which, when fingerprints match it sends a signal to a servo motor to move from one position to another.
I want to translate my Arduino project into my photon for reducing size and as requirement for the class.

I’m having trouble communicating the sensor with the photon as it appears there’s no communication between the both of them.

Any help would be appreciate

here’s my original code:

#include<LiquidCrystal.h>
LiquidCrystal lcd(13,12,11,10,9,8);
#include <SoftwareSerial.h>
SoftwareSerial fingerPrint(2, 3);
#include<Servo.h>

Servo myServo;
int pos1=0;

#include <Adafruit_Fingerprint.h>
uint8_t id;
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&fingerPrint);

#define enroll 14
#define del 15
#define up 16
#define down 17
#define openLight 6
#define closeLight 7
#define servoPin 5

void setup() 
{
    delay(1000);
    myServo.attach(servoPin, 650, 2200);
    myServo.write(0);
    pinMode(enroll, INPUT_PULLUP);
    pinMode(up, INPUT_PULLUP); 
    pinMode(down, INPUT_PULLUP); 
    pinMode(del, INPUT_PULLUP); 
    pinMode(openLight, OUTPUT);
    pinMode(closeLight, OUTPUT);
    lcd.begin(16,2);
    lcd.print("Security System");
    lcd.setCursor(0,1);
    lcd.print("by Finger Print");
    delay(2000);
    lcd.clear();
    lcd.print("Circuit Digest");
    lcd.setCursor(0,1);
    lcd.print("DJM PROJECT");
    delay(2000);
    finger.begin(57600);
    Serial.begin(9600);
    lcd.clear();
    lcd.print("Finding Module");
    lcd.setCursor(0,1);
    delay(1000);
    if (finger.verifyPassword()) 
    {
      Serial.println("Found fingerprint sensor!");
      lcd.clear();
      lcd.print("Found Module ");
      delay(1000);
    } 
    else 
    {
    Serial.println("Did not find fingerprint sensor :(");
    lcd.clear();
    lcd.print("module not Found");
    lcd.setCursor(0,1);
    lcd.print("Check Connections");
    while (1);
    }
}

void loop() 
{
 lcd.setCursor(0,0);
 lcd.print("Press UP/Down ");
 lcd.setCursor(0,1);
 lcd.print("to start System");
 digitalWrite(closeLight, HIGH);
 if(digitalRead(up)==0 || digitalRead(down)==0)
 {
  for(int i=0;i<5;i++)
  {
    lcd.clear();
    lcd.print("Place Finger");
    delay(2000);
    int result=getFingerprintIDez();
    if(result>=0)
    {
        digitalWrite(openLight, HIGH);
        digitalWrite(closeLight, LOW);
        lcd.clear();
        lcd.print("Allowed");
        lcd.setCursor(0,1);
        lcd.print("Gate Opened   ");
        myServo.write(90);
        delay(5000);
        myServo.write(0);
        digitalWrite(closeLight, HIGH);
        digitalWrite(openLight, LOW);
        lcd.setCursor(0,1);
        lcd.print("Gate Closed   ");
        return;
     }
   }
 }
 checkKeys();
 delay(1000);
}

void checkKeys()
{
   if(digitalRead(enroll) == 0)
   {
    lcd.clear();
    lcd.print("Please Wait");
    delay(1000);
    while(digitalRead(enroll) == 0);
    Enroll();
   }

   else if(digitalRead(del) == 0)
   {
    lcd.clear();
    lcd.print("Please Wait");
    delay(1000);
    delet();
   }  
}

void Enroll()
{
   int count=0;
   lcd.clear();
   lcd.print("Enroll Finger    ");
   lcd.setCursor(0,1);
   lcd.print("Location:");
   while(1)
   {
     lcd.setCursor(9,1);
     lcd.print(count);
     if(digitalRead(up) == 0)
     {
       count++;
       if(count>25)
       count=0;
       delay(500);
     }

     else if(digitalRead(down) == 0)
     {
       count--;
       if(count<0)
       count=25;
       delay(500);
     }
     else if(digitalRead(del) == 0)
     {
          id=count;
          getFingerprintEnroll();
          return;
     }

       else if(digitalRead(enroll) == 0)
     {        
          return;
     }
 }
}

void delet()
{
   int count=0;
   lcd.clear();
   lcd.print("Delete Finger    ");
   lcd.setCursor(0,1);
   lcd.print("Location:");
   while(1)
   {
     lcd.setCursor(9,1);
     lcd.print(count);
     if(digitalRead(up) == 0)
     {
       count++;
       if(count>25)
       count=0;
       delay(500);
     }

     else if(digitalRead(down) == 0)
     {
       count--;
       if(count<0)
       count=25;
       delay(500);
     }
     else if(digitalRead(del) == 0)
     {
          id=count;
          deleteFingerprint(id);
          return;
     }

       else if(digitalRead(enroll) == 0)
     {        
          return;
     }
 }
}

void serv()
{
  for(pos1 = 180; pos1>=1; pos1-=1)
  {
    myServo.write(pos1);
    delay(2); // tiempo que tarda en ir a la siguiente posicion
  }
  delay(2000);
  for(pos1 = 0; pos1 <180; pos1+=1)
  {
 myServo.write(pos1);
 delay(0.5); //tiempo que tarda en retroceder
  }
} 

uint8_t getFingerprintEnroll() 
{
  int p = -1;
  lcd.clear();
  lcd.print("finger ID:");
  lcd.print(id);
  lcd.setCursor(0,1);
  lcd.print("Place Finger");
  delay(2000);
  while (p != FINGERPRINT_OK)
  {
    p = finger.getImage();
    switch (p)
    {
    case FINGERPRINT_OK:
      Serial.println("Image taken");
      lcd.clear();
      lcd.print("Image taken");
      break;
    case FINGERPRINT_NOFINGER:
      Serial.println("No Finger");
      lcd.clear();
      lcd.print("No Finger");
      break;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      lcd.clear();
      lcd.print("Comm Error");
      break;
    case FINGERPRINT_IMAGEFAIL:
      Serial.println("Imaging error");
      lcd.clear();
      lcd.print("Imaging Error");
      break;
    default:
      Serial.println("Unknown error");
       lcd.clear();
      lcd.print("Unknown Error");
      break;
    }
  }

  // OK success!

  p = finger.image2Tz(1);
  switch (p) {
    case FINGERPRINT_OK:
      Serial.println("Image converted");
      lcd.clear();
      lcd.print("Image converted");
      break;
    case FINGERPRINT_IMAGEMESS:
      Serial.println("Image too messy");
       lcd.clear();
       lcd.print("Image too messy");
      return p;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      lcd.clear();
      lcd.print("Comm Error");
      return p;
    case FINGERPRINT_FEATUREFAIL:
      Serial.println("Could not find fingerprint features");
      lcd.clear();
      lcd.print("Feature Not Found");
      return p;
    case FINGERPRINT_INVALIDIMAGE:
      Serial.println("Could not find fingerprint features");
      lcd.clear();
      lcd.print("Feature Not Found");
      return p;
    default:
      Serial.println("Unknown error");
      lcd.clear();
      lcd.print("Unknown Error");
      return p;
  }
  
  Serial.println("Remove finger");
  lcd.clear();
  lcd.print("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");
   lcd.clear();
      lcd.print("Place Finger");
      lcd.setCursor(0,1);
      lcd.print("   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");
      return;
    }
  }

  // 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!");
    lcd.clear();
    lcd.print("Stored!");
    delay(2000);
  } 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;
  }   
}

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)
  {
   lcd.clear();
   lcd.print("Finger Not Found");
   lcd.setCursor(0,1);
   lcd.print("Try Later");
   delay(2000);  
  return -1;
  }
  // found a match!
  Serial.print("Found ID #"); 
  Serial.print(finger.fingerID); 
  return finger.fingerID; 
}

uint8_t deleteFingerprint(uint8_t id) 
{
  uint8_t p = -1;  
  lcd.clear();
  lcd.print("Please wait");
  p = finger.deleteModel(id);
  if (p == FINGERPRINT_OK) 
  {
    Serial.println("Deleted!");
    lcd.clear();
    lcd.print("Figer Deleted");
    lcd.setCursor(0,1);
    lcd.print("Successfully");
    delay(1000);
  } 
  
  else 
  {
    Serial.print("Something Wrong"); 
    lcd.clear();
    lcd.print("Something Wrong");
    lcd.setCursor(0,1);
    lcd.print("Try Again Later");
    delay(2000);
    return p;
  }   
}

Thanks!

ScruffR · November 16, 2018, 7:01am

It would make more sense to (also) show the code you are running on the Photon.
On the Photon I’d rather use hardware Serial1 instead of SoftwareSerial.
Also doublecheck that your external hardware does work with 3.3V signals, otherwise you may need to add level shifting.

Also what pins are you using on the Photon?

dsn101 · November 17, 2018, 1:37am

Hi, I currently just put the same part of the sensor code in the photon to look which commands are not compatible and reassign the pins as
Photon - - >sensor
Tx-------------Rx
Rx------------Tx
Gnd - - - - - - Gnd
Vin-----------V

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Photon with fingerprint scanner and servo

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