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wireless data transfer using 433MHz transmitter

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gaurav yadav

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i have 433mhz tx and rx pair having data rate of 4KBps i have to transmite data from robot(ATMEGA 16) to computer terminal using RS232 protocal its a simplex type of communication . which ic should i use for encoding and decoding the data
 

nandhu015

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HT12 pair will suit your need

Nandhu
 

gaurav yadav

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i have to send data using UART so can i connect
TX SIDE:

UART(COMPUTER)---->>MAX232--->>>D0(HT12E)
DOUT(HT12E)---->>>WIRELESS TRANSMITTER

RX SIDE:

WIRELESS RECEIVER--->>>DIN(HT12D)
D0(HT12D)--->>>UART(ATMEGA16)


as ht12e send 12 bit frame 8 for address bit and 4 data bit(D0 D1 D2 D3)
it also send 12 pilot bit

so if i select baud rate of uart terminal 1/24 of ht12E bit rate i can get correct data or not
and plz tell me if there is a mistake
 
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ctownsend

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gaurav yadav said:
i have to send data using UART so can i connect
TX SIDE:

UART(COMPUTER)---->>MAX232--->>>D0(HT12E)
DOUT(HT12E)---->>>WIRELESS TRANSMITTER

RX SIDE:

WIRELESS RECEIVER--->>>DIN(HT12D)
D0(HT12D)--->>>UART(ATMEGA16)


as ht12e send 12 bit frame 8 for address bit and 4 data bit(D0 D1 D2 D3)
it also send 12 pilot bit

so if i select baud rate of uart terminal 1/24 of ht12E bit rate i can get correct data or not
and plz tell me if there is a mistake
this is totally wrong. How are you going to control the TE pin on the encoder?
Also on the receiver, you need to detect when VT goes high, then and only then do you read the data pins.

For the TX:
If you are using RS232 from a PC, you should have a microcontroller to receive the data from a max232, then send the data to the encoder from the microcontroller, then pulse the TE pin on the encoder.

For the RX:
connect the wireless receiver to the decoder, then the decoder to another microcontroller which then monitors the VT pin. When the VT pin goes high, the microcontroller reads the four data pins.

You can look in the encoder/decoder datasheets for a sample circuit or just search google.
 

gaurav yadav

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what maximum data transfer rate should i expect
with my module and what should i choose my fosc
 

nandhu015

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The data transfer rate depends on the distance between the units

Nandhu
 

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