Literature review is an important step before proceed to the project

Literature review is an important step before proceed to the project. By collecting all the required information about the 433MHz RF modules. The literature review also can provide a useful information to complete the project. The idea for this project comes from the problem faced when the data that have been transmitted becomes losses with the range that provided. In this chapter it will be explained more details about all the flow and also the components that will be used in this project.

This frequency 433MHz that using in wireless sensor network which is used in building and want to test the sending and receiving data without any data loss. 433MHz RF Modules required the 17cm of the antenna to support the range to send the data. Range is the one of the most important parameter of any wireless system which is it defined how the transmitter and receiver can be apart from each other. 433MHz RF Modules are used to build the wireless connection between two points. For the outside with few obstacles the data can go through hundreds meters. While for the indoor, the data can go for over 50 meters through multiple walls. The external antenna will be soldering to the “ANT” on the transmitter to get more range which is 17cm of the length for the antenna.

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The Arduino Pro is a microcontroller board based on the ATmega328. This microcontroller distributed as open-source hardware and software, permitting the manufacturer of Arduino boards. The Pro comes in 3.3V/8MHz version. This version can powered with a battery. It has 14 digital pins which is can be used as input or output, 6 analog inputs, a battery power jack, a power switch, a reset button, a holes for mounting a power jack, an ICSP header and pin header. A pin header can be connected to an FTDI cable. Each pin can provide or receive a maximum of 40mA. Arduino Pro can be powered via the USB header, with a battery or with an external power supply.

In this project, the RFM69HCW which is 433MHz RF Module version that has been chosen because it is an inexpensive and versatile radio module that operates in the unlicensed ISM (Industry Science and Medicine) radio band. It’s available for using in the building inexpensive short range wireless networks of sensors. This types can operates on the 433MHz frequency and can capable of transmitting at up to 100mW and up to 300kbps. In addition, this types can be maximize range by increasing the transmit power and reducing the data rate or it can be reduce both for short-range sensor that sip battery power.

Micro-B is the smallest USB connector type. Nearly uses in every new cell phone uses that Micro-B connector that you might already have one or two cables laying around.

Using this board because the standard FTDI board cannot supply the enough current to run the RFM69 433MHz RF Modules.

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