Walkie-Talkie using NRF24L01: Nowadays we are living in the area of 4G and 5G. Almost all devices enabled 4G or 5G. However, old technologies like walkie-talkies and RF communication are still in use. In this modern age, Arduino-based walkie-talkies are mostly used.
The range of old technology is very short but less costly. If we have to communicate in a company or in a small industry, then we use less costly devices like RF communication or walkie-talkies. With the help of a walkie-talkie, we can communicate with each other by pressing the push-to-talk (PTT) button.
Walkie-talkie using NRF24L01 RF Module
The main component of this project is the Arduino Uno and NRF24L01 RF module. The brain of this circuit is Arduino for processing. We are using the NRF24L01 module. It has a 2.4 GHz very high-frequency ISM band. Its data rate can be 250 kbps, 1 mbps, and 2 mbps. Due to these features, it is the best choice. It may have 125 channels with 1 MHz spacing. So 125 people can communicate with each other at a time.
Another advantage of the NRF24L01 module is that its signals don’t interfere with other walkie-talkie systems like railway walkie-talkies and police walkie-talkies. A single NRF24L01 module can be attached to 6 other NRF24L01 modules at a time when they are receiving data. The power consumption of the modules is very low; it is another advantage of NRF24L01.
Types of NRF Communication Modules
There are two types of NRF communion modules commonly used.
- NRF24L01+
- NRF24L01+PA+LNA
The NRF24L01+ has an onboard antenna, and its range is only 100 meters. It is not suitable for outdoor communication, so use it for indoor communication. Moreover, signals become very poor between the walls.
The NRF24L01+PA+LNA with an external antenna. PA is used to boost the power of signals before transmission. LNA stands for a low-noise amplifier. It is used to clear the uncertain low level of signals. Due to the external antenna, its range is 1000 meters.
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