Communication among electronic devices and human machine interfacing requires some specialized components. These modules readily incorporate those specialized components and are ready to interface with microcontroller.
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NRF24L01 2.4GHz RF Communication Module

The NFR24L01 is a transceiver module which means that it can both send and receive the data.

These modules are very cheap, smaller in size and has a lot of specifications. Some of the specifications of these modules are as follows

Specifications of NRF24L01 Module

·         Power consumption is around 12mA during transmission which is even lesser than the led.
·         It can operate with baud rates from 250Kbps up to 2 Mbps.
·         Its range can reach up to 100 meters if used in open space and with antenna.
·         It can both send and receive the data simultaneously.
·         Each module can communicate with up to 6 other modules.
·         It uses the 2.4 GHz band.
·         It can send 1 to 25 bytes of raw data at the transmission rate of 1 MB.
·         It has 125 different channels.

Pin out

The NRF24L01 module works with the Arduino through the SPI communication. The pinout of the module is as follows

NRF24L01 Pinout

The operating voltage of this module is from 1.9 to 3.6V but the other pins are 5V tolerant which means that the other pins can be directly connected to the Arduino.

The MOSI, MISO and the SCK are the SPI pins and these needs to be connected to the SPI pins of Arduino. Different Arduino’s have different SPI pins.

The CSN and CE are for setting the module in active mode and for switching between command and transmit mode. These can be connected to any digital pins of Arduino.

The IRQ pin is the interrupt pin and you don’t have to connect it.

433Mhz RF Decoder Transmitter With Receiver Module Kit
his is 433Mhz RF transmitter with receiver kit for ARM MCU wireless
Application environment:
Remote control switch, receiver module, motorcycles, automobile anti-theft products, home security products, electric doors, shutter doors, windows, remote control socket, remote control LED, remote audio remote control electric doors, garage door remote control, remote control retractable doors, remote volume gate, pan doors, remote control door opener, door closing device control system, remote control curtains, alarm host, alarm, remote control motorcycle remote control electric cars, remote control MP3.


Receiver module:
Product Model: XD-RF-5V
Operating voltage: DC5V
Quiescent Current: 4MA
Receiving frequency: 433.92MHZ
Receiver sensitivity: -105DB

Technical parameters of
Product Model: XD-FST
Launch distance :20-200 meters (different voltage, different results)
Operating voltage :3.5-12V
Dimensions: 19 * 19mm
Operating mode: AM
Transfer rate: 4KB / S
Transmitting power: 10mW
Transmitting frequency: 433M
Pinout from left → right: (DATA; VCC; GND)
Audio Bluetooth Stereo Module
Stereo Audio Bluetooth module, gives out stereo audio output. 5V Power supply
Bluetooth Communication Module HC-05
Very simple Bluetooth module (Based on BC417 Chip) to connect it with your microcontroller , Arduino , Raspberry Pi , or any MCU board using the TTL UART interface.
ESP32 WiFi Wroom 32Bit MCU Devlopment Board
ESP32 wroom 32 ESP32-WROOM-32 DevKitC Development Board, ESP-32, 38-pin DevKitC Layout
This is a development board for the ESP-WROOM-32 module from Expressif Systems. A further development from the popular ESP8266 modules, this comes with both Wifi and Bluetooth. It is supported by the Arduino IDE, and also supports Micropython and there is developing support for NodeMCU Lua.

There are different variations of these development boards available. They offer similar capabilities but with different pinout configuration. This listing is for the 38 (2 x 19) pin layout, sometimes called the DevKitC Development board. It measures 55mm x 29mm x 14mm

CPU Tensilica Dual Core 32-bit 240 MHz LX6 processor, integrated 520 Kb SRAM
Wifi 802.11 b/g/n/e/i
Bluetooth v4.2 BR/EDR and BLE
Memory 4 MByte Flash
Temperature Range -40 to 125 Deg C.

The USB interface uses a Silicon labs CP210x chip. Drivers are required for most operating systems, but are freely available : download 

Extensive documentation is available on the Expressif or visit

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