So, connect its first pin (which is the base pin) to the pin 11 through to a 1KΩ resistor, second pin (which is the collector pin) to the negative wire of push pull solenoid and third pin (which is the emitter pin) to the ground. The NPN transistor will switch ON when we will give HIGH to its base. So to do that, we will use TIP120 NPN transistor as a switch/driver and a DC power source which can provide 6 ~ 12V. To connect the push pull solenoid with the Arduino, we will have to use external power because it requires 6 ~ 12V to operate and much more current than the Arduino can provide. Connect first six pins of keypad to analog pins A0 ~ A5 of Arduino and remaining two to digital pins 3 and 2. We used analog pins since we need more that 14 digitals pins for this project. If you are using Arduino Mega, then there is no need to use analog pins. For connecting the keypad with the Arduino we are using both analog and digital pins. Components RequiredĬircuit Diagram & Explanation Digital Door Lock using Arduino – Circuit Diagramįirst of all, we will make the connection to the 4×4 Keypad. It will open your door only when the right password is entered and it will start beeping when a wrong password is entered. In this project we will make a digital door lock system with keypad using Arduino Uno. As thefts are increasing day by day security is becoming a major concern nowadays.
0 kommentar(er)
