I found it is hard to make RF transceivers even with years of expereince. Even it is a kind of worthless when the working guaranteed modules are already available.
- nRF24L01.jpg (21.67 KiB) Viewed 11767 times
NRF24L01 Wireless Transceiver Module is one good example. You can buy two of them for < $8 and I'm sure it will cost you more to even build one. Have a look at this eBay deal.
http://cgi.ebay.com/Arduino-NRF24L01-Wi ... 415b5fd1b8.
The coding would be very easy.
TX mode:
Code: Select all
void setup()
{
SPI_DIR = ( CE + SCK + CSN + MOSI);
SPI_DIR &=~( IRQ + MISO);
Serial.begin(9600);
init_io();
TX_Mode();
}
void loop()
{
unsigned char status=0;
unsigned char key=0;
for(;;)
{
tx_buf[1]=key;
key++;
status=SPI_Read(STATUS);
if(status&TX_DS)
{
SPI_RW_Reg(FLUSH_TX,0);
Serial.println(tx_buf[1],HEX);
SPI_Write_Buf(WR_TX_PLOAD,tx_buf,TX_PLOAD_WIDTH);
}
SPI_RW_Reg(WRITE_REG+STATUS,status);
delay(1000);
}
}
RX mode:
Code: Select all
void setup()
{
SPI_DIR = ( CE + SCK + CSN + MOSI);
SPI_DIR&=~ ( IRQ + MISO);
Serial.begin(9600);
init_io();
RX_Mode();
}
void loop()
{
unsigned char status=0;
unsigned char key=0;
for(;;)
{
tx_buf[1]=key;
key++;
status=SPI_Read(STATUS);
if(status&TX_DS)
{
SPI_RW_Reg(FLUSH_TX,0);
Serial.println(tx_buf[1],HEX);
SPI_Write_Buf(WR_TX_PLOAD,tx_buf,TX_PLOAD_WIDTH);
}
SPI_RW_Reg(WRITE_REG+STATUS,status);// clear RX_DR or TX_DS or MAX_RT interrupt flag
delay(1000);
}
}
You can find a sample TX, RX code here:
If you really want to build it yourself, you can find the schematic in the following archive.
More information can be found in
Arduino site.
. So I'm planing to use digital electronics for this. But the only issue is the transmitter and receiver. Is it possible to modulate a digital code in a FM carrier frequency ? If so can any give me an example or any information regarding this ?
there is no anything to do, just play with new toy 
