cặp thu phát FS1000A_PCR1A 315mhz

[hector]

bác nào co kinh nghiệm về 2 con này thì giúp em với.em truyền nhận tín hiệu giữa 2 con này băng pic 16f887.nhưng mạch chỉ chạy đúng khi em cấp điện vào còn sau đó thì chỉ nhân dc toàn tín hiệu nhiễu.em nghĩ code đúng vì nó nhận đúng khi cấp điện.nhưng ko hiểu sao chỉ đúng trong lần phát đầu tiên.ko biết 2 con này nên xài anten như thế nào.em chỉ gắn sợi dây điện làm anten cho nó
đây là code viết trong mikroc

Trans:


// Manchester module connections
sbit MANRXPIN at RC0_bit;
sbit MANRXPIN_Direction at TRISC0_bit;
sbit MANTXPIN at RC1_bit;
sbit MANTXPIN_Direction at TRISC1_bit;
// End Manchester module connections

char index, character;
char s1[] = "This is";
char noise = 0;

void main() {

ANSEL = 0; // Configure AN pins as digital I/O
ANSELH = 0;
C1ON_bit = 0; // Disable comparators
C2ON_bit = 0;
Man_Send_Init(); // Initialize transmitter

while (1) { // Endless loop


Man_Send(0x0B); // Send "start" byte
Delay_ms(500); // Wait for a while

character = s1[0]; // Take first char from string
index = 0; // Initialize index variable
while (character) { // String ends with zero

Man_Send(character);
Delay_ms(90); // Wait for a while
index++; // Increment index variable
character = s1[index]; // Take next char from string
}
Man_Send(0x0E); // Send "end" byte

Delay_ms(2000);
}
}






code Receiver:

// Manchester module connections Start
sbit MANRXPIN at RC0_bit;
sbit MANRXPIN_Direction at TRISC0_bit;
sbit MANTXPIN at RC1_bit;
sbit MANTXPIN_Direction at TRISC1_bit;
// End Manchester module connections End

unsigned char error = 0, ErrorCount = 0, temp = 0;

void main() {

ANSEL = 0; // Configure AN pins as digital I/O
ANSELH = 0;
C1ON_bit = 0; // Disable comparators
C2ON_bit = 0;


UART1_Init(9600);

Man_Receive_Init(); // Initialize Receiver


do{ // Rx Routine forever loop

GET_BYTE:
temp = Man_Receive(&error); // Attempt byte receive

if (error) goto ERROR_BYTE; // if comm's error goto error handler
goto START_BYTE; // if good byte Received goto start handler

ERROR_BYTE:
UART1_Write_Text("ErrorByte count = "); // Write error and count to UART
ErrorCount++; // Update error counter
UART1_Write(ErrorCount+48);
UART1_Write_Text("\n\r");
if(ErrorCount > 5) goto RE_SYNC;
goto GET_BYTE;

START_BYTE:
if (temp == 0x0B){ // "Start" byte value expected is 0xC3
goto DISPLAY_BYTE; // goto the Display routine
}
goto NOISE_BYTE; // Valid data byte found is not a start byte
// go to noise reporting loop

DISPLAY_BYTE:
if(temp == 0x0E) goto STOP_BYTE; // Valid Stop Byte found Exit

UART1_Write_Text("Valid Data Found\n\r"); // Send Activity to UART


while (1){ // loop to collect all valid data
temp = Man_Receive(&error); // Attempt byte receive
if (error) goto ERROR_BYTE; // if comm's error goto error handler
if (temp == 0x0E)break; // Stop condition found Exit while loop
UART1_Write(temp); // write received byte on UART
}
UART1_Write_Text("\n\r"); // new line + Carriage Return

goto STOP_BYTE; // Exit UART write loop

NOISE_BYTE:
UART1_Write_Text("Synchronized But Data Found is Noise = "); // Send Activity to UART
UART1_Write(temp);
UART1_Write_Text("\n\r");
goto GET_BYTE; // Exit noise detect loop

RE_SYNC:

UART1_Write_Text("Synchronizing\n\r"); // Display Activity on 2nd Row
delay_ms(50);
temp = Man_Synchro(); // Try to synchronize again
ErrorCount = 0; // Reset error counter
if (temp == 0xFF) goto RE_SYNC; // Sync failed try again
goto GET_BYTE; // Sync complete start over again

STOP_BYTE:
if (temp == 0x0E){ // If "End" byte was received
UART1_Write_Text("Valid Stop Found\n\r"); // Send Activity to UART
delay_ms(100);
}
goto GET_BYTE; // start over again

}while(1); // Rx Routine

} // main