433 MHz RF Transmitter Module | Code | Circuit | Pin configuration | Program

433 MHz RF Transmitter Module

RF Transmitter Module is a wireless communication module that operates at 433Mhz frequency and it has a limited range of data transmission or simply say that it is a short-range wireless communication device. For wireless communication, we need a Transmitter and receiver module. In this tutorial, we will discuss the Transmitter module. It has SIMPLEX MODE communication that means we can send data from the transmitter to the receiver, only one-way communication is possible. You can use this module with microcontrollers or directly with the TTL switching devices.

RF: Radio Frequency

Model number: FS1000A

Other names: 433MHz RF Transmitter, RF-Transmitter, RF-Tx Module.

Other similar devices: 315 MHz, nrf24L01

RF TRANSMITTER

Pin configuration

VCC	Power supply positive pin
GND	Power supply negative pin
DATA	Data transmit out
ANT	Antenna

 

Features

• Modulation: ASK (Amplitude shift keying)
• It supports simplex communication
• The minimum power supply is required to operate is 5v
• Low cost
• Without an antenna, we can send data up to 1-meter

 

Technical Specifications

• Model Number: FS1000A
• Operating voltage: Transmitter: 5v
• Operating frequency: 433.92 MHz
• Turn ON time: min-10ms, typical-20ms.
• Data rate: typical-1kbps,max-3kbps.
• Communication range: 50mts
• Circuit model: saw resonator

 

Where to use 433MHz RF Module

It is a short-range wireless  communication, based on this specification we will use this module where we  need to design short-range wireless applications such as following:

Example-1 I want to unlock the car door remotely, we can design this application using this RF module

Example-2 Design of remote toy cars for wireless control

Example-3 wireless water level indicator, in such applications, if the distance between an alarm indicator and a water tank is very less, then we can go for wired  communication, but in some buildings, it is not possible to make a 50mts of wire and arrangement in that application it is better to implement wireless communication.

   

How RF Transmitter Module Work

RF Transmitter sends the data using serial transmission with the data rate of 3kbps speed. The main part of the module is SAW resonator  which is used to tuned for 433Mhz frequency and this module has inbuilt circuitry like a transistor and some other passive components

when the input is applied as LOGIC-1 to the DATA pin , the oscillator starts to resonate and generates a 433Mhz signal, when the LOGIC-0 is applied the oscillator stops, this type of working is known as ASK Modulation.

 

How to use 433Mhz RF Transmitter module | Arduino with

433Mhz RF Transmitter Module

RF Transmitter Module sends the serial data using DATA pin. you can interface this module directly with any of the electronic switching devices other-wise you can interface with microcontrollers.

Note:  Here I’m giving a 5V power supply

Arduino Interface with RF Transmitter

VCC	5V-Arduino
GND	GND-Arduino
DATA	9-Arduino
ANT	Connect to 10cm wire

 

Circuit diagram

 

 

ARDUINO WITH RF MODULE CIRCUIT

Circuit Explanation

In the above circuit, we apply the 5v dc supply using Arduino as shown in the circuit diagram and the input of this module is a push-button switch. According to my circuit when the switch is closed state it gives LOGIC-0 and when the switch is in an open state it gives LOGIC-1, this data LOGIC-1 or LOGIC-0  will send to the Receiverpart over the air.

So we can say that when the input switch is in closed state RF Transmitter module sends LOGIC-0 to the receiver when the switch is in  open state RF Transmitter sends LOGIC-1 to the receiver part.

Arduino with RF Transmitter Code

/***************************************************** # RF Transmitter code Example sketch follow us: www.technoelectronics44.com ******************************************************/ #include<SoftwareSerial.h> int rf_data=9; int sw=8; void setup() { Serial.begin(9600); Serial.print("WELCOME TO TECHNOELECTRONICS44"); pinMode(sw, INPUT); pinMode(rf_data, OUTPUT); digitalWrite(rf_data,HIGH); } void loop() { if(digitalRead(sw)==LOW) { digitalWrite(rf_data,LOW); } if(digitalRead(sw)==HIGH) { digitalWrite(rf_data,HIGH); } delay(500); }

Datasheet

 

Applications

• Remote controls
• Automation systems
• Wireless security system
• Short distance communication (simplex)
• Industrial wireless security alarm systems

 

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