My problem is the pin 4 connection for the dual realy module is already active , I want the arduino to stay close , when the fingerprint is correct that the time the arduino pin 4 must give signal to the arduino relay
I think i have a code problem here
#include <Adafruit_Fingerprint.h> //Libraries needed
#include <SoftwareSerial.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
#define I2C_ADDR 0x27 //LCD i2c stuff
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
int in1 = 5; // In1 and In2 for the L298n H bridge module
int in2 = 4;
int But1=8; // In order to add a push button I got the 5v from the pin 8 instead of "5v" arduino pin
int But2=9;
String Names[] = { "Yassine", "Surtr", "Tech",}; //Those are the names affected to the fingertemplates IDs
//The first on which is Names[0] : Yassine has the ID 1 in the fingerprint sensor
SoftwareSerial mySerial(2, 3); //Fingerprint sensor wiring RX 3, TX 2
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin); //LCD declaring
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial); //Fingerprint sensor declaring
void setup()
{
pinMode(in2, OUTPUT);
Serial.begin(9600); //Serial begin incase you need to see something on the serial monitor
finger.begin(57600); //Sensor baude rate
lcd.begin (16,2);
lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH);
lcd.home ();
finger.getTemplateCount(); //Counts the number of templates stored in the sensor flash memory
delay(2000);
lcd.setCursor(0,0);
lcd.print("Place finger");
CloseDoor(); //As we don't know the state of the lock system, first we make sure it's closed
}
void loop()
{
getFingerprintIDez(); //This function keeps looping and waiting for a fingerprint to be put on the sensor
delay(50);
bool Button1=digitalRead(But2); //Reading the state of the pushbutton
if(Button1==HIGH){ //If the button is pressed it opens the doorlock as the button is meant to be inside
OpenDoor(); //And once more it depends on your system, mine requires an electrical signal to open
delay(5000); //Opening delay 5s
CloseDoor(); //Closing sequence requires electrical signal otherwise it stays open
}
}
//Main function taken from the "fingerprint" example and modified
//Only the modifications are commented
int getFingerprintIDez() {
uint8_t p = finger.getImage(); //Image scanning
if (p != FINGERPRINT_OK) return -1;
p = finger.image2Tz(); //Converting
if (p != FINGERPRINT_OK) return -1;
p = finger.fingerFastSearch(); //Looking for matches in the internal memory
if (p != FINGERPRINT_OK){ //if the searching fails it means that the template isn't registered
lcd.clear(); //And here we write a message or take an action for the denied template
lcd.print("Access denied");
delay(2000);
lcd.clear();
lcd.print("Place finger");
return -1;
}
//If we found a match we proceed in the function
lcd.clear();
lcd.print("Welcome"); //Printing a message for the recognized template
lcd.setCursor(2,1);
lcd.print(Names[finger.fingerID-1]); //Then print the name we gave it and the -1 is to remove the shift as the ID starts from "1" but the array from "0"
OpenDoor(); //Opening and closing sequence
delay(5000);
CloseDoor();
lcd.clear();
lcd.print("Place finger");
return finger.fingerID;
}
/*The two following functions depends on your locking system
*mine has a DC motor that should turn in both ways for opening and closing
*that's why I'm using H bridge, you could have a solenoid with a transistor
*then you'll need only opening sequence but controlling the transistor
*as the closing is spring loaded...
*/
void OpenDoor(){
digitalWrite(in1, LOW); //Turn in a direction for 100ms and stops
digitalWrite(in2, HIGH); //it's not the delay for the whole sequence
delay(5000); // the sequence delay is above (5000) 5s
}
void CloseDoor(){
digitalWrite(in1, HIGH); //Turn in other direction for 100ms and stops
digitalWrite(in2, LOW);
delay(5000);
}
Your code does not match your schematic. The schematic shows a relay and a motor but your code refers to an H bridge controller on pins 4 and 5.
If you want to change your code, you just need to declare pin 4 as an OUTPUT (which you did) and then just drive it HIGH or LOW with digitalWrite().
Be aware that some relay modules turn the relay on when the signal is LOW and off when it is HIGH. Others have this the other way.
It also matters how you have the output side of the relay wired up - using either the NO (Normally open) or NC (normally closed) terminal along with the COM (common) terminal.
Have you tested your code in smaller blocks, like verifying the fingerprint sensor works and the motor control works? Verify each part is operating as desired and then incorporate the parts in the master code.
void OpenDoor(){
digitalWrite(in2, HIGH); //it's not the delay for the whole sequence
delay(100); // the sequence delay is above (5000) 5s
digitalWrite(in2, LOW);
}
but I experieced this error
C:\Users\USER\AppData\Local\Temp\ccgd6oMY.ltrans0.ltrans.o: In function `main':
C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/main.cpp:46: undefined reference to `loop'
collect2.exe: error: ld returned 1 exit status
Multiple libraries were found for "SoftwareSerial.h"
Used: C:\Program
Multiple libraries were found for "LCD.h"
Used: C:\Users\USER\Documents\Arduino\libraries\Newliquidcrystal_1.3.5
Multiple libraries were found for "Wire.h"
Used: C:\Program
Multiple libraries were found for "Adafruit_Fingerprint.h"
Used: C:\Users\USER\Documents\Arduino\libraries\Adafruit-Fingerprint-Sensor-Library-master
exit status 1
Error compiling for board Arduino/Genuino Uno.
Ok the code works now in the finger print sends signal in the PIN 4 digital pin ,
1st the Fingerprint send signal the motor turns onn
but the problem is the motor wont turn off
I wanted the motor to turn off its self after 5 second after recognizxing my finger print
#include <Adafruit_Fingerprint.h> //Libraries needed
#include <SoftwareSerial.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
#define I2C_ADDR 0x27 //LCD i2c stuff
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
int in2 = 4;
int But1=8; // In order to add a push button I got the 5v from the pin 8 instead of "5v" arduino pin
int But2=9;
String Names[] = { "Yassine", "Surtr", "Tech",}; //Those are the names affected to the fingertemplates IDs
//The first on which is Names[0] : Yassine has the ID 1 in the fingerprint sensor
SoftwareSerial mySerial(2, 3); //Fingerprint sensor wiring RX 3, TX 2
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin); //LCD declaring
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial); //Fingerprint sensor declaring
void setup()
{
pinMode(in2, OUTPUT);
digitalWrite(in2, HIGH);
pinMode(But1, OUTPUT); //Push button stuff, I made the pin 8 permanent HIGH level
digitalWrite(But1,HIGH);
pinMode(But2,INPUT); //And I read the button state on pin 9
Serial.begin(9600); //Serial begin incase you need to see something on the serial monitor
finger.begin(57600); //Sensor baude rate
lcd.begin (16,2);
lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH);
lcd.home ();
finger.getTemplateCount(); //Counts the number of templates stored in the sensor flash memory
delay(2000);
lcd.setCursor(0,0);
lcd.print("Place finger"); //As we don't know the state of the lock system, first we make sure it's closed
}
void loop()
{
getFingerprintIDez(); //This function keeps looping and waiting for a fingerprint to be put on the sensor
delay(50);
bool Button1=digitalRead(But2); //Reading the state of the pushbutton
if(Button1==HIGH){ //If the button is pressed it opens the doorlock as the button is meant to be inside
OpenDoor(); //And once more it depends on your system, mine requires an electrical signal to open
delay(5000); //Opening delay 5s //Closing sequence requires electrical signal otherwise it stays open
}
}
//Main function taken from the "fingerprint" example and modified
//Only the modifications are commented
int getFingerprintIDez() {
uint8_t p = finger.getImage(); //Image scanning
if (p != FINGERPRINT_OK) return -1;
p = finger.image2Tz(); //Converting
if (p != FINGERPRINT_OK) return -1;
p = finger.fingerFastSearch(); //Looking for matches in the internal memory
if (p != FINGERPRINT_OK){ //if the searching fails it means that the template isn't registered
lcd.clear(); //And here we write a message or take an action for the denied template
lcd.print("Access denied");
delay(2000);
lcd.clear();
lcd.print("Place finger");
return -1;
}
//If we found a match we proceed in the function
lcd.clear();
lcd.print("Welcome"); //Printing a message for the recognized template
lcd.setCursor(2,1);
lcd.print(Names[finger.fingerID-1]); //Then print the name we gave it and the -1 is to remove the shift as the ID starts from "1" but the array from "0"
OpenDoor(); //Opening and closing sequence
delay(5000);
lcd.clear();
lcd.print("Place finger");
return finger.fingerID;
}
/*The two following functions depends on your locking system
*mine has a DC motor that should turn in both ways for opening and closing
*that's why I'm using H bridge, you could have a solenoid with a transistor
*then you'll need only opening sequence but controlling the transistor
*as the closing is spring loaded...
*/
void OpenDoor(){
digitalWrite(in2, HIGH); //it's not the delay for the whole sequence
delay(100); // the sequence delay is above (5000) 5s
digitalWrite(in2, LOW);
}
you can't have your button wired between two pins and have one of the permanently HIGH since the button will be floating most of the time.
You also have your motor logic reversed. If the motor does not stop, it means the LOW signal turns the motor on and the HIGH signal turns it off.
#include <Adafruit_Fingerprint.h> //Libraries needed
#include <SoftwareSerial.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
#define I2C_ADDR 0x27 //LCD i2c stuff
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
int in2 = 4;
int But1=8; // In order to add a push button I got the 5v from the pin 8 instead of "5v" arduino pin
int But2=9;
String Names[] = { "Yassine", "Surtr", "Tech",}; //Those are the names affected to the fingertemplates IDs
//The first on which is Names[0] : Yassine has the ID 1 in the fingerprint sensor
SoftwareSerial mySerial(2, 3); //Fingerprint sensor wiring RX 3, TX 2
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin); //LCD declaring
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial); //Fingerprint sensor declaring
void setup()
{
pinMode(in2, OUTPUT);
digitalWrite(in2, HIGH);
pinMode(But1, OUTPUT); //Push button stuff, I made the pin 8 permanent LOW level
digitalWrite(But1,LOW);
pinMode(But2,INPUT_PULLUP); //And I read the button state on pin 9
Serial.begin(9600); //Serial begin incase you need to see something on the serial monitor
finger.begin(57600); //Sensor baude rate
lcd.begin (16,2);
lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH);
lcd.home();
finger.getTemplateCount(); //Counts the number of templates stored in the sensor flash memory
delay(2000);
introScreen();
}
void loop()
{
int result = getFingerprintIDez(); //This function keeps looping and waiting for a fingerprint to be put on the sensor
//delay(50);
bool Button1=digitalRead(But2); //Reading the state of the pushbutton
if(Button1==LOW or result >= 0){
//If the button is pressed it opens the doorlock as the button is meant to be inside
OpenDoor();
introScreen();
}
}
void introScreen()
{
lcd.clear();
lcd.print("Place finger");
}
//Main function taken from the "fingerprint" example and modified
//Only the modifications are commented
int getFingerprintIDez() {
uint8_t p = finger.getImage(); //Image scanning
if (p != FINGERPRINT_OK) return -1;
p = finger.image2Tz(); //Converting
if (p != FINGERPRINT_OK) return -1;
lcd.clear(); //And here we write a message or take an action for the denied template
p = finger.fingerFastSearch(); //Looking for matches in the internal memory
if (p != FINGERPRINT_OK){ //if the searching fails it means that the template isn't registered
lcd.print("Access denied");
delay(2000);
introScreen();
return -1;
}
//If we found a match we proceed in the function
lcd.print("Welcome"); //Printing a message for the recognized template
lcd.setCursor(2,1);
lcd.print(Names[finger.fingerID-1]); //Then print the name we gave it and the -1 is to remove the shift as the ID starts from "1" but the array from "0"
return finger.fingerID;
}
/*The two following functions depends on your locking system
*mine has a DC motor that should turn in both ways for opening and closing
*that's why I'm using H bridge, you could have a solenoid with a transistor
*then you'll need only opening sequence but controlling the transistor
*as the closing is spring loaded...
*/
void OpenDoor(){
digitalWrite(in2, LOW); // turn on motor
delay(5000);
digitalWrite(in, HIGH); // turn off motor
}
