Step 2: Motorised Lock Control


The Lock control is handled by a motor controller.  This builds on what we have built so far,  the button press now opens the lock. Then does the count down and closes the lock.
 
Arduino sends instructions to the motor controller via the Arduinos Digital pins 4 and 6 to the Motor controllers pins In3 and In4.

D4 D6 to left to pins of In3 In4

Action

10 (HIGH,LOW)

Motor turns clockwise

01 (LOW,HIGH)

Motor turns anticlockwise

11 (HIGH,HIGH)

Motor breaks

00 (LOW,LOW)

Motor is free


  • Arduino connects its 5v to motor controller +5V and the Ground to Ground.  
  • The Lock Connector contains the power to drive the lock, it’s Ground line also connects to the Motor Controllers Ground.  The Locks Power line connects to the Motor Controllers +Vcc.
  • The next two pins are the Locks motor and these connect to the Motor Controller pins Out0 and Out 1.


There is also two more pins on the Lock connection.
A Mont pin, that is 0v when the locks latch is closed and +v when the locks latch is open.  I currently don’t test this.  
The last pin is to a Setter switch, it’s like a reset button this is on the lock and does something with original controller but I don’t use it.  It reports 0v when no pushed and +V when pressed.

wiring diagram
Click to see larger Image


Above you can see the wiring needed to connect the lock motor. The actual circuit may look something like this.

RFID step2

There are two bits of code added to control the lock when the button is pressed.

Below opens the lock.
   digitalWrite(motor0,LOW);  // Open lock
   
digitalWrite(motor1,HIGH);
   
delay(500);                         // Time for lock to open fully
   
digitalWrite(motor0,LOW);  // Stop motor
   
digitalWrite(motor1,LOW);

Below closes the lock.
   digitalWrite(motor0,HIGH);  // Close Lock motor
   
digitalWrite(motor1,LOW);
   
delay(500);
   
digitalWrite(motor0,LOW);  // Stop lock motor
   
digitalWrite(motor1,LOW);

#include <LiquidCrystal.h>

#define motor0 4  
// digital pins the lock uses
#define motor1 6

// initialize the library with the numbers of the interface pins
LiquidCrystal  lcd(7, 8, 9, 10, 11, 12);

byte  ch0[8] = {B11111,B11111,B11111,B11111,B11111,B11111,B11111,0};
byte  ch1[8] = {B11110,B11110,B11110,B11110,B11110,B11110,B11110,0};
byte  ch2[8] = {B11100,B11100,B11100,B11100,B11100,B11100,B11100,0};
byte  ch3[8] = {B11000,B11000,B11000,B11000,B11000,B11000,B11000,0};
byte  ch4[8] = {B10000,B10000,B10000,B10000,B10000,B10000,B10000,0};
byte  ch5[8] = {B00000,B00000,B00000,B00000,B00000,B00000,B00000,0};

int  beeper = 0;                    // Beeper flag 0 = off

void  setup()
{
 
pinMode(13,  OUTPUT);       // door beeper
 
pinMode(A5,  INPUT);         // Button input - we are using as a digital pin

 
pinMode(motor0,OUTPUT);  // set lock motor pins to output
 
pinMode(motor1,OUTPUT);

 lcd.
begin(16, 2);              // set up the LCD's number of columns and rows: 
 lcd.
print("Lock test");  // Print startup message to the LCD.

 
Serial.begin(19200);         // For Serial debugging, 19200 baud because

Serial.println("Ready");     // that’s the speed the RFID card works at.
 
 
 lcd.
createChar(0, ch0);       // initialise our custom characters
 lcd.
createChar(1, ch1);
 lcd.
createChar(2, ch2);
 lcd.
createChar(3, ch3);
 lcd.
createChar(4, ch4);
 lcd.
createChar(5, ch5);
}
  // end setup

void  loop()
{
boolean  buttonState =  digitalRead(A5);  // get button state
buttonState =! buttonState;                 
// Invert button state to match logic
 
 
if  (buttonState ==  true){
   
Serial.println(buttonState);

   digitalWrite(motor0,LOW);  // Open lock
   
digitalWrite(motor1,HIGH);
   
delay(500);                           // time for lock to open fully 
   
digitalWrite(motor0,LOW);  // Stop motor
   
digitalWrite(motor1,LOW);
 
   lcd.
setCursor(0, 1);
   
for  (int  i=0; i <= 15; i++)  // print 16 block characters
   {
     lcd.
print((char) 0);
   }
   
delay(100);
 
   
for  (int  i=15; i >= 0; i--)  
   {    
  // loop through the 16 characters
     
for  (int  c=0; c <= 5; c++)  
     {    
// loop through the 16 characters places of the LCD screen
     beeper=!beeper;
       
digitalWrite(13, beeper);  // Turn beeper on or off
       lcd.
setCursor(i, 1);
       lcd.
print((char) c);     // print our custom character
       
delay(100);              // the delays add up to about 8 seconds, 
                                   
  // that's how long the door lock will be open for.
     }
   }  
  // end count down loop 
   
digitalWrite(13, 0);     // set beeper off

   digitalWrite(motor0,HIGH);  // Close Lock motor 
   
digitalWrite(motor1,LOW);
   
delay(500);
   
digitalWrite(motor0,LOW);  // Stop lock motor
   
digitalWrite(motor1,LOW);

 }
  // end if button loop
}
  // end main loop 

















































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