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PASSWORD PROTECTED DOOR LOCK

    In this blog, we will learn about how to make password-protected door locking mechanisms. The password with by given by the serial monitor. If the password is right door will open and if it's wrong door will not open. The movement of the door is controlled by a servo motor and the status of the password is displayed on the LCD display. If the password is correct it will let the person know id is correct and if the password is wrong invalid message is displayed.  You can use Bluetooth for serial communication in real-life scenarios and feed the password to the system through Bluetooth. The application of this can be anywhere you need to use a protected Door. From the below link you can see the working of the project. The below link is of an online circuit simulation software called tinker cad. You need to just log in to the software, tinker cad is free of cost. If  you are interested to see the working go to the link below: https://www.tinkercad.com/things/cDqHb0Nnye2-harshal-sa
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How to read analog and digital data both at same time using Arduino

  From the above circuit, we can read both analog and digital data both at the same time and display the reading over a 16X2 LCD display. We have used PIR( passive infrared  sensor ) motion sensor for analog values and push button for digital values. The PID motion sensor is connected to analog pin 0 and push button is connected to digital pin 9 of the Arduino .   PIR motion sensor are used to detects infrared radiation from the environment. It does not emit any energy but passively receives infrared radiation from the environment. There's a amazing fact human body also emit electromagnetic radiation. The radiation emitted by human body depends on the temperature of the body. Radiation emitted by human body is in the infrared region. Pin1 is output pin   Pin2 is VCC pin Pin3 of the sensor connected to the ground   If  you are interested to see the working go to the link below: https://www.tinkercad.com/things/0N5AvKIBaFp-harshal-sawant/editel?sharecode=9g8Qhm7tNrbUJ0BNs2aA8S3WWaa6p
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Interfacing RELAY with Arduino UNO

  Interfacing RELAY with Arduino UNO What is Relay? Relay is an automatic switch that detects conditions in circuits and causes the contacts to change their positions to close or open the circuit as required. Relays are used in many applications. When the coil of the relay is energized or de-energized, its contacts are ON or Off.          In a relay, we have to consider two important parameters i.e. once is the Trigger Voltage, this is the voltage required to turn on the relay that is to change the contact from Common->NC to Common->NO. Our relay here has a 5V trigger voltage.   Let’s understand the interfacing of relay with Arduino I amusing online simulation software (Tinker cad). Tinker cad helps to interface, code, and simulate online. All the components I have used are present in the software. You can also build your own circuit. All the components have been labeled in the above Figure. The push-button is connected  to pin2 which is a digital pin and the relay is con
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