用nRF905和DS18B20制作的51单片机温度数据无线传输系统

我用DS18B20和两套由nRF905组成的无线数传模块制作了一套温度数据的无线传输采集系统，已经调试通过，效果良好。其硬件电路框图如下：

(AM,CD与单片机的P1.3,P1.4的连接未画出)

DS18B20是MAXIM公司推出的数字温度传感器，将它测量的温度数据直接送到单片机，再由单片机传给nRF905，数据经调制后被发送出去。nRF905工作于433/868/915MHz三个ISM(工业、科学和医学)频道，这里使用的是433MHz的载频。另外一套nRF905无线数传模块收到信号后，经解调得到的原始温度数据传给单片机，单片机通过串口把数据再传给上位电脑，最后经过处理的温度数据连同日期、时间、采集点等相关信息可以被自动录入电脑保存并实时显示在电脑屏幕上。简单的电脑数据显示界面如下图：

本系统实物照片如下：

照片中左边为带有DS18B20数字温度传感器的用作发射数据的nRF905无线数传模块，右边为用作接收数据的nRF905数传模块，其中的单片机可以通过串口和电脑相连，上传数据。

/

#include 

#include 

#define uchar unsigned char

#define uintunsigned int

#define WC0x00// Write configuration register command

#define RC0x10// Readconfiguration register command

#define WTP0x20// Write TX Payloadcommand

#define RTP0x21// ReadTX Payloadcommand

#define WTA0x22// Write TX Addresscommand

#define RTA0x23// ReadTX Addresscommand

#define RRP0x24// ReadRX Payloadcommand

typedef struct RFConfig

{

uchar n;

uchar buf[10];

}RFConfig;

code RFConfig RxTxConf =

{

10,

0x01, 0x0c, 0x44, 0x20, 0x20, 0xcc, 0xcc, 0xcc,0xcc, 0x58

};

// The content of this struct is nRF905s initialize data.初始化数据

// CH_NO=1;433MHZ;Normal Opration,No Retrans;RX,TX Address is 4 Bytes

// RX TX Payload Width is 32 Bytes;Disable Extern Clock;Fosc=16MHZ

// 8 Bits CRC And enable

uchar data TxBuf[32];

uchar data RxBuf[32];

uchar key,rsbrf,delayf,tf;

uchar bdata DATA_BUF;

sbit flag =DATA_BUF^7;

sbit flag1 =DATA_BUF^0;

sbit TX_EN =P1^7;

sbit TRX_CE =P1^6;

sbit PWR_UP =P1^5;

sbit MISO =P1^1;

sbit MOSI =P1^0;

sbit SCK=P3^7;

sbit CSN=P3^3;

sbit AM=P1^3;

sbit DR=P3^2;

sbit CD=P1^4;

sbitLED1=P3^4;

sbitLED2=P3^5;

sbitKEY1=P3^0;

sbitKEY2=P3^1;

void InitIO(void);// Initialize IO port

void Inituart(void);// initialize 232 uart

void Config905(void);// Config nRF905 module配置NRF905模式

void SetTxMode(void);// Set nRF905 in Tx mode

void SetRxMode(void);// Set nRF905 in Rx mode

void TxPacket(void);// Send data by nRF905

void RxPacket(void);// Recive data by nRF905

void SpiWrite(uchar);// Write data to nRF905

uchar SpiRead(void);// Read data to nRF905

void Delay(uchar n);// Delay 100us

void Scankey(void);// Scan key

void TxData (uchar x);// Send key_value to CRT display

void comdebug(void);

void Delay(uchar n)

{

uint i;

while(n--)

for(i=0;i<80;i++);

}

void main()

{

unsigned int cyc=0;

unsigned int distan=0;

//================NRF905初始化

CSN=1;// Spidisable

SCK=0;// Spi clock line init high

DR=1;// Init DR for input

AM=1;// Init AM for input

PWR_UP=1;// nRF905 power on

TRX_CE=0;// Set nRF905 in standby mode

TX_EN=0;// set radio in Rx mode

//================

Config905();// Config nRF905 module

TxBuf[0] = 1;

TxBuf[1] = 1;

SetTxMode();// Set Tx Mode

TxPacket();// Transmit Tx buffer data

LED1 = 0;

LED2 = 0;

Delay(500);// delay for led light

LED1 = 1;

LED2 = 1;

TxBuf[0] = 0xff;

TxBuf[1] = 0xff;

// led close

SetRxMode();// Set nRF905 in Rx mode

while(1)

{

//=====================从键盘获得数据

if(KEY1 ==0 ) { LED1 = 0; TxBuf[0] = 1 ;tf = 1 ; }

if(KEY2 ==0 ) { LED2 = 0; TxBuf[1] = 1 ;tf = 1 ; }

if (tf==1)

{

//===============NRF905发送相应的按键

SetTxMode();// Set Tx Mode

TxPacket();// Transmit Tx buffer data

TxBuf[0] = 0xff;

TxBuf[1] = 0xff;

SetRxMode();// Set nRF905 in Rx mode

tf=0;

Delay(500);

LED1 = 1;

LED2 = 1;

}

//=====================等待NRF905接收

if (DR)// If recive data ready...

RxPacket();// ... recive data

}

}

//function Config905();

void Config905(void)

{

uchar i;

CSN=0;// Spi enable for write a spi command

SpiWrite(WC);// Write config command写放配置命令

for (i=0;i写放配置字

{

SpiWrite(RxTxConf.buf[i]);

}

CSN=1;// Disable Spi

}

//function SpiWrite();

void SpiWrite(ucharbyte)

{

uchar i;

DATA_BUF=byte;// Put functions parameter into a bdata variable

for (i=0;i<8;i++)// Setup byte circulation bits

{

if (flag)// Put DATA_BUF.7 on data line

MOSI=1;

else

MOSI=0;

SCK=1;// Set clock line high

DATA_BUF=DATA_BUF<1; // Shift DATA_BUF

SCK=0;// Set clock line low

}

}

//function SpiRead();

uchar SpiRead(void)

{

uchar i;

for (i=0;i<8;i++)// Setup byte circulation bits

{

DATA_BUF=DATA_BUF<1; // Right shift DATA_BUF

SCK=1;// Set clock line high

if (MISO)

flag1=1;// Read data

else

flag1=0;

SCK=0;// Set clock line low

}

return DATA_BUF;// Return function parameter

}

//function TxPacket();

void TxPacket(void)

{

uchar i;

//Config905();

CSN=0;// Spi enable for write a spi command

SpiWrite(WTP);// Write payload command

for (i=0;i<32;i++)

{

SpiWrite(TxBuf[i]);// Write 32 bytes Tx data

}

CSN=1;// Spi disable

Delay(1);

CSN=0;// Spi enable for write a spi command

SpiWrite(WTA);// Write address command

for (i=0;i<4;i++)// Write 4 bytes address

{

SpiWrite(RxTxConf.buf[i+5]);

}

CSN=1;// Spi disable

TRX_CE=1;// Set TRX_CE high,start Tx data transmission

Delay(1);// while (DR!=1);

TRX_CE=0;// Set TRX_CE low

}

//function RxPacket();

void RxPacket(void)

{

uchar i;

TRX_CE=0;// Set nRF905 in standby mode

CSN=0;// Spi enable for write a spi command

SpiWrite(RRP);// Read payload command

for (i=0;i<32;i++)

{

RxBuf[i]=SpiRead();// Read data and save to buffer

}

CSN=1;// Disable spi

while(DR||AM);

// P0= RxBuf[0];// Buffer[0] output from P0 port...

TRX_CE=1;

//xx=(RxBuf[0]>>4)&0x0f;

//TxData(xx);

//=====================

if(RxBuf[0] == 1) LED1 = 0 ;

if(RxBuf[1] == 1) LED2 = 0 ;

Delay(500);// ...light led

// P0=0xff;// Close led

LED1 = 1 ;

LED2 = 1 ;

}

//function SetTxMode();

void SetTxMode(void)

{

TX_EN=1;

TRX_CE=0;

Delay(1);// delay for mode change(>=650us)

}

//function SetRxMode();

void SetRxMode(void)

{

TX_EN=0;

TRX_CE=1;

Delay(1);// delay for mode change(>=650us)

}****************************************