Arduino door lock with keypad12/24/2023 For that we add a 1k ohm resistor from the push button output pin to ground. In this case I want to detect HIGH state of the button and that means that the button will normally be in the LOW state. Remember that to any push button that we add we have to give it a pullup or pulldown resistor. Let's take a look at the schematic first. Another push button connected to pin D13 will close the door from inside of the room. This button will open the door from inside for "emergency" exit. A push button will be connected to dgital pin D12 and this button will be placed inside of the room. We also connect a buzzer to pin 11 in order to give sound error signals as well. If not, an error will show up and we have to try again. If the password is OK, a servo connected to pin D10 will spin in order to slide a door lock. We will have a simple code that will read each inserted character in order to create our password. So we will connect this keypad to digital pins D2 to D9 of the microcontroller. Now that we know how this keypad should work we can take a look at our schematic. Also, when you release the key you can track the key RELEASED event if you are using the eventListener feature of the library. The function getKey() returns a key value as soon as you press the key but it does not repeat automatically. And the same thing will happen if you sprinkle a bunch of delay(10)'s all through your code. Something as short as delay(250) can make the keypad seem very unresponsive. Consider, though, when you are writing your code that every delay() you use will take processing time away from the keypad. The library is non-blocking which means you can press and hold the key all day long and your Arduino will continue processing the rest of your code. But this library uses 4 pins for columns and 4 pins for rows for this 4x4 keypad. Normally we shoud use two pins for each button to be able to detech esch push. Using the KeyPad library we will be able to read each of the 16 buttons that this keypad has using just 8 pins of the arduino. You could use any Arduino boar that you want. We will conect a small thin Keypad that I've bought from eBay for less than 70 cnts to one Arduino microntroller. With this your DIY Password-Based Door Lock is ready.This should be a cool and easy project. The safebox we made earlier uses the Fingerprint Sensor. You can enter the room only if you have the correct password. NOTE: You can use any lock as per your choice. We have attached the keypad to one of our doors and a solenoid to it. The one we are showing here is as the door lock. There are a number of applications for this project. You can change the number of digits you want in the passcode. Also, you need to set the password in the code itself. If the password is correct: the screen of evive displays “ACCESS GRANTED” and the RGB turns GREEN.Īnd the solenoid gets the signal, thus the magnet attracts the slot, opening the door.Īpply the following code for the working of same. Once you enter all 4 digits, and if the password is wrong: the screen displays “ACCESS DENIED” and the RGB turns RED. This shows the total number of digits entered by you. The screen on evive shows “Enter Password”.Īs soon as we press a digit the LED of the corresponding number turns to BLUE. We have set the passcode of 4 digits (you can set as much as you want). This Strip is to indicate the status of the entire system. Once you are done with the circuit, it’s time to understand the logic behind it. We will be connecting the Keypad and the lock to evive.Ĭonnect both lock and Keypad as shown below: Logic Lie back and chill (and Netflix if you want) as your home and office stay protected from break-ins and thefts. Behold the *drum rolls* DIY Password-Based Door Lock!Ī simple yet effective way to prevent anybody from accessing your room without entering the correct password. We’re here to add yet another way to help you stop worrying worrying about the safety of your abode, your workplace, and any other place you have. Dale Carnegie gave us ‘How to stop worrying and start living’.
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