Components required
- Microcontroller (P89V51RD2) (2)
- Resistor 10K (1)
- Capacitor 33pF (2)
- Capacitor 10uF (1)
- 11.0592MHz Crystal (1)
- 433MHz RF Transmitter (1)
- 433MHz RF Receiver (1)
- Buzzer(optional) (1)
Circuit Diagram and Description
[caption id="attachment_513" align="aligncenter" width="2116"]
Receiving circuit[/caption]
[caption id="attachment_514" align="aligncenter" width="1621"]
Transmitting Circuit[/caption]
Connections of the Transmitter Module
The smaller module of the two with a crystal on it is the Transmitter module. The Pin connections for the module are as below
Pin on Module Connection
GND GND on 8051 Board
DATA P3.1 on 8051 Board
Vcc Vcc on 8051 Board
ANT Connected to 17.25cm long wire
Connections for the Receiver Module
The Larger module of the two is the Receiver module.The Module has multiple GND and Vcc pins which need to be connected externally. The Pin connections for the module are as below
Pin on Module Connection
GND GND on 8051 Board
DATA P3.0 on 8051 Board
Vcc Vcc on 8051 Board
ANT Connected to 17.25cm long wire
About the Program
In this particular program, we are using UART to transmit 8-bit data over the RF module. The data pin of the transmit module is connected to the transmit pin of the 8051. When the Switch 4 is pressed on the 8051 Board then the ASCII value of character t is sent over the RFmodule.If this is received at the receiving 8051 then the Buzzer will turn on for 5 Seconds.
Download
Click here to download the C, Assembly and Hex file.
This article is written by Aditya Wani.
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