During early days of mine as an electronic hobbyist, the wireless communication had always
got me excited . Afterall, who wouldnot grow tired of those tangling wires of wired bot. 😛 So i got the cheapest rf module available in the market, without knowing much about it. 😛
So this is a simple project for the beginners who are going to use rf modules for the first time. Here, the signals are generated by the user via push buttons and is sent to the receiver module kept at a distance.
Let us grasp some basic information on the working of a RF- module.
These RF modules work between 30Khz-300 Ghz. In our case, it’s frequency is around 400Mhz-500Mhz (434 MHz approaximately). The digital data is represented as the variations in the amplitude of the carrier signal according to the message signal (known as ASK).It receives serial data and transmits it wirelessly through RF through its antenna. The transmission occurs at the rate of 1Kbps – 10Kbps.The transmitted data is received by an RF receiver operating at the same frequency as that of the transmitter.
- 1-8 for addressing purposes
- 9- ground
- 10-13 for inputting the parallel data
- 17 for actual data pin connected to the transmitter
- 18 voltage
The encoder encodes the input parallel binary data along with its address. In case of multiple transmitter units, this addressing helps identify which transmitter actually transmitted the data.
- 1-8 for addressing
- 9 – ground
- 10-13 parallel data output
- 14 serial data coming from the receiver
- 15-16 resistance for setting the frequency of operation
- 17 threshold voltage(remained open
- 18 voltage
The addressing here matches the address of this receiver unit to determine which transmitter unit send the signals.
Since by default, 1111 will be sent to the receiver unit, we will connect LED according to as shown in the figure. Whenever, any PushButton will be pressed at the transmitter part, corresponding LED will glow.
There should be seperate power supply for Transmitter and Receiver part.
Connecting 9/12 volts to the voltage pin of the transmitter and receiver increases their range considerably.
Here is the video for the completed project :
for the complete description of project:
for working only part:
Thanks a lot..