![]() Majority of mailboxes are open and shut type i.e. The main sensor used for detecting the mail is the photo resistor or LDR. The aim of the project is to notify the user with a message whenever he/she receives a mail in their mailbox. In this project, a simple mail alert system is developed using simple and cheap wireless communication devices. As mentioned in the transmitter part, a simple 15 CM long wire will act as the antenna. Hence, the data out pin of the RF Receiver is connected to pin 11 of the Arduino. The GND is connected to ground pin of the Arduino.Īrduino UNO receives data from the RF Receiver. The VCC pin must be connected to 3.3V pin of the Arduino just to be safe (although the receiver module can tolerate 5V). As the aim of the project is to simply transmit the message on the event of reception of mail, no other components are used in the receiver section. The receiver part of the project consists of Arduino UNO board and the 434 MHz RF Receiver Module. In order to convert the change of resistance to something which Arduino can easily understand, the LDR and an additional resistor (10 KΩ or 15 KΩ) are connected in a potential divider fashion (as LDR is basically a variable resistor) and the output of this potential divider is connected to the Analog Input A0 of the Arduino. over 10 meters, then we need to connect a 15 CM antenna (a simple wire will suffice).Ĭoming to the sensor part of the project, the LDR must be connected to the Analog IN pins of the Arduino. Some RF Transmitter modules comes with antenna attached to the board.įor smaller distances, the antenna is really not necessary. So, it is connected to pin 12 of the Arduino UNO. The data pin receives data from the Arduino UNO. These two terminals can be connected to the respective pins of the Arduino. VCC is connected to 5V supply and GND is connected to ground terminal. The transmitter module used in the project consists of 4 pins. ![]() The transmitter part of the project consists of Arduino UNO, 434 MHz RF Transmitter Module and a photo resistor. It can be used in wireless data transmission for different applications like RC cars, wireless doorbells, home automation etc.Ī Photo Resistor or Light Dependent Resistor (LDR) is an analog device, whose resistance varies according the ambient light incident on it. The 434 MHz RF Transmitter – Receiver pair is a cheap way to implement wireless communication. We have used two Arduino boards in this project and to be more specific we have used Arduino UNO. 434 MHz (or 315 MHz) RF Receiver ModuleĪrduino acts as the main controlling part of the project.Arduino UNO (or any other Arduino compatible board).Photo Resistor (Light Dependent Resistor – LDR).434 MHz (or 315 MHz) RF Transmitter Module.Arduino UNO (or any Arduino compatible board).The following image shows the circuit diagram of the Receiver part of the project. The following image shows the circuit diagram of the Transmitter or Sender part of the project. Since the project is based on RF Modules, the circuit is divided in to transmitter and receiver.
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