外形

注意事项

引脚设置为开漏输出
模块可以3.3v供电

代码

代码来自STM32 单片机 GY-906 MLX90614 红外温度读取
这位大哥的

main

temp=SMBus_ReadTemp();printf("ÎÂ¶ÈÖµÎª£º%.2f\r\n",temp);
HAL_Delay(100);

.c

#include "mlx90614.h"/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ACK  0
#define NACK 1
#define SA              0x00 //Slave address x
#define RAM_ACCESS      0x00 //RAM access command RAM´æÈ¡ÃüÁî
#define EEPROM_ACCESS   0x20 //EEPROM access command EEPROM´æÈ¡ÃüÁî
#define RAM_TOBJ1       0x07 //To1 address in the eeprom Ä¿±ê1ÎÂ¶È,¼ì²âµ½µÄºìÍâÎÂ¶È -70.01 ~ 382.19¶È#define SMBUS_PORT GPIOB      //PB¶Ë¿Ú(¶Ë¿ÚºÍÏÂÃæµÄÁ½¸öÕë½Å¿É×Ô¶¨Òå)
#define SMBUS_SCK       GPIO_PIN_6 //PB6£ºSCL
#define SMBUS_SDA       GPIO_PIN_7 //PB7£ºSDA2#define RCC_APB2Periph_SMBUS_PORT     RCC_APB2Periph_GPIOB#define SMBUS_SCK_H()       SMBUS_PORT->BSRR = SMBUS_SCK //ÖÃ¸ßµçÆ½
#define SMBUS_SCK_L()       SMBUS_PORT->BRR = SMBUS_SCK  //ÖÃµÍµçÆ½
#define SMBUS_SDA_H()       SMBUS_PORT->BSRR = SMBUS_SDA
#define SMBUS_SDA_L()       SMBUS_PORT->BRR = SMBUS_SDA#define SMBUS_SDA_PIN()      SMBUS_PORT->IDR & SMBUS_SDA //¶ÁÈ¡Òý½ÅµçÆ½/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*//*******************************************************************************
* Function Name  : SMBus_StartBit
* Description    : Generate START condition on SMBus
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SMBus_StartBit(void)
{SMBUS_SDA_H();     // Set SDA lineSMBus_Delay(5);      // Wait a few microsecondsSMBUS_SCK_H();        // Set SCL lineSMBus_Delay(5);      // Generate bus free time between StopSMBUS_SDA_L();        // Clear SDA lineSMBus_Delay(5);        // Hold time after (Repeated) Start// Condition. After this period, the first clock is generated.//(Thd:sta=4.0us min)ÔÚSCK=1Ê±£¬¼ì²âµ½SDAÓÉ1µ½0±íÊ¾Í¨ÐÅ¿ªÊ¼£¨ÏÂ½µÑØ£©SMBUS_SCK_L();      // Clear SCL lineSMBus_Delay(5);        // Wait a few microseconds
}/*******************************************************************************
* Function Name  : SMBus_StopBit
* Description    : Generate STOP condition on SMBus
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SMBus_StopBit(void)
{SMBUS_SCK_L();     // Clear SCL lineSMBus_Delay(5);        // Wait a few microsecondsSMBUS_SDA_L();        // Clear SDA lineSMBus_Delay(5);        // Wait a few microsecondsSMBUS_SCK_H();        // Set SCL lineSMBus_Delay(5);      // Stop condition setup time(Tsu:sto=4.0us min)SMBUS_SDA_H();      // Set SDA lineÔÚSCK=1Ê±£¬¼ì²âµ½SDAÓÉ0µ½1±íÊ¾Í¨ÐÅ½áÊø£¨ÉÏÉýÑØ£©
}/*******************************************************************************
* Function Name  : SMBus_SendByte
* Description    : Send a byte on SMBus
* Input          : Tx_buffer
* Output         : None
* Return         : None
*******************************************************************************/
u8 SMBus_SendByte(u8 Tx_buffer)
{u8 Bit_counter;u8  Ack_bit;u8  bit_out;for(Bit_counter=8; Bit_counter; Bit_counter--){if (Tx_buffer&0x80){bit_out=1;   // If the current bit of Tx_buffer is 1 set bit_out}else{bit_out=0;  // else clear bit_out}SMBus_SendBit(bit_out);       // Send the current bit on SDATx_buffer<<=1;             // Get next bit for checking}Ack_bit=SMBus_ReceiveBit();       // Get acknowledgment bitreturn Ack_bit;
}/*******************************************************************************
* Function Name  : SMBus_SendBit
* Description    : Send a bit on SMBus 82.5kHz
* Input          : bit_out
* Output         : None
* Return         : None
*******************************************************************************/
void SMBus_SendBit(u8 bit_out)
{if(bit_out==0){SMBUS_SDA_L();}else{SMBUS_SDA_H();}SMBus_Delay(2);                    // Tsu:dat = 250ns minimumSMBUS_SCK_H();                   // Set SCL lineSMBus_Delay(6);                  // High Level of Clock PulseSMBUS_SCK_L();                  // Clear SCL lineSMBus_Delay(3);                    // Low Level of Clock Pulse
//  SMBUS_SDA_H();                  // Master release SDA line ,return;
}/*******************************************************************************
* Function Name  : SMBus_ReceiveBit
* Description    : Receive a bit on SMBus
* Input          : None
* Output         : None
* Return         : Ack_bit
*******************************************************************************/
u8 SMBus_ReceiveBit(void)
{u8 Ack_bit;SMBUS_SDA_H();          //Òý½Å¿¿Íâ²¿µç×èÉÏÀ£¬µ±×÷ÊäÈëSMBus_Delay(2);           // High Level of Clock PulseSMBUS_SCK_H();          // Set SCL lineSMBus_Delay(5);          // High Level of Clock Pulseif (SMBUS_SDA_PIN()){Ack_bit=1;}else{Ack_bit=0;}SMBUS_SCK_L();            // Clear SCL lineSMBus_Delay(3);            // Low Level of Clock Pulsereturn   Ack_bit;
}/*******************************************************************************
* Function Name  : SMBus_ReceiveByte
* Description    : Receive a byte on SMBus
* Input          : ack_nack
* Output         : None
* Return         : RX_buffer
*******************************************************************************/
u8 SMBus_ReceiveByte(u8 ack_nack)
{u8     RX_buffer;u8    Bit_Counter;for(Bit_Counter=8; Bit_Counter; Bit_Counter--){if(SMBus_ReceiveBit())          // Get a bit from the SDA line{RX_buffer <<= 1;          // If the bit is HIGH save 1  in RX_bufferRX_buffer |=0x01;}else{RX_buffer <<= 1;           // If the bit is LOW save 0 in RX_bufferRX_buffer &=0xfe;}}SMBus_SendBit(ack_nack);            // Sends acknowledgment bitreturn RX_buffer;
}/*******************************************************************************
* Function Name  : SMBus_Delay
* Description    : ÑÓÊ±  Ò»´ÎÑ»·Ô¼1us
* Input          : time
* Output         : None
* Return         : None
*******************************************************************************/
void SMBus_Delay(u16 time)
{delay_us(time);
}/*******************************************************************************
* Function Name  : SMBus_Init
* Description    : SMBus³õÊ¼»¯
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SMBus_Init()
{SMBUS_SCK_H();SMBUS_SDA_H();
}/******************************************************************************** Function Name  : SMBus_ReadMemory* Description    : READ DATA FROM RAM/EEPROM* Input          : slaveAddress, command* Output         : None* Return         : Data
*******************************************************************************/
u16 SMBus_ReadMemory(u8 slaveAddress, u8 command)
{u16 data;          // Data storage (DataH:DataL)u8 Pec;                // PEC byte storageu8 DataL=0;         // Low data byte storageu8 DataH=0;            // High data byte storageu8 arr[6];         // Buffer for the sent bytesu8 PecReg;          // Calculated PEC byte storageu8 ErrorCounter;  // Defines the number of the attempts for communication with MLX90614ErrorCounter=0x00;                // Initialising of ErrorCounterslaveAddress <<= 1;   //2-7Î»±íÊ¾´Ó»úµØÖ·do{repeat:SMBus_StopBit();             //If slave send NACK stop comunication--ErrorCounter;                   //Pre-decrement ErrorCounterif(!ErrorCounter)               //ErrorCounter=0?{break;                       //Yes,go out from do-while{}}SMBus_StartBit();              //Start conditionif(SMBus_SendByte(slaveAddress))//Send SlaveAddress ×îµÍÎ»Wr=0±íÊ¾½ÓÏÂÀ´Ð´ÃüÁî{goto   repeat;             //Repeat comunication again}if(SMBus_SendByte(command))     //Send command{goto repeat;             //Repeat comunication again}SMBus_StartBit();                   //Repeated Start conditionif(SMBus_SendByte(slaveAddress+1))   //Send SlaveAddress ×îµÍÎ»Rd=1±íÊ¾½ÓÏÂÀ´¶ÁÊý¾Ý{goto    repeat;                 //Repeat comunication again}DataL = SMBus_ReceiveByte(ACK);    //Read low data,master must send ACKDataH = SMBus_ReceiveByte(ACK); //Read high data,master must send ACKPec = SMBus_ReceiveByte(NACK);   //Read PEC byte, master must send NACKSMBus_StopBit();              //Stop conditionarr[5] = slaveAddress;     //arr[4] = command;            //arr[3] = slaveAddress+1;    //Load array arrarr[2] = DataL;                //arr[1] = DataH;              //arr[0] = 0;                  //PecReg=PEC_Calculation(arr);//Calculate CRC}while(PecReg != Pec);       //If received and calculated CRC are equal go out from do-while{}data = (DataH<<8) | DataL;  //data=DataH:DataLreturn data;
}/*******************************************************************************
* Function Name  : PEC_calculation
* Description    : Calculates the PEC of received bytes
* Input          : pec[]
* Output         : None
* Return         : pec[0]-this byte contains calculated crc value
*******************************************************************************/
u8 PEC_Calculation(u8 pec[])
{u8     crc[6];u8   BitPosition=47;u8  shift;u8    i;u8    j;u8    temp;do{/*Load pattern value 0x000000000107*/crc[5]=0;crc[4]=0;crc[3]=0;crc[2]=0;crc[1]=0x01;crc[0]=0x07;/*Set maximum bit position at 47 ( six bytes byte5...byte0,MSbit=47)*/BitPosition=47;/*Set shift position at 0*/shift=0;/*Find first "1" in the transmited message beginning from the MSByte byte5*/i=5;j=0;while((pec[i]&(0x80>>j))==0 && i>0){BitPosition--;if(j<7){j++;}else{j=0x00;i--;}}/*End of while *//*Get shift value for pattern value*/shift=BitPosition-8;/*Shift pattern value */while(shift){for(i=5; i<0xFF; i--){if((crc[i-1]&0x80) && (i>0)){temp=1;}else{temp=0;}crc[i]<<=1;crc[i]+=temp;}/*End of for*/shift--;}/*End of while*//*Exclusive OR between pec and crc*/for(i=0; i<=5; i++){pec[i] ^=crc[i];}/*End of for*/}while(BitPosition>8); /*End of do-while*/return pec[0];
}/******************************************************************************** Function Name  : SMBus_ReadTemp* Description    : Calculate and return the temperature* Input          : None* Output         : None* Return         : SMBus_ReadMemory(0x00, 0x07)*0.02-273.15
*******************************************************************************/
float SMBus_ReadTemp(void)
{   float temp;temp = SMBus_ReadMemory(SA, RAM_ACCESS|RAM_TOBJ1)*0.02-273.15;return temp;
}

.h

#ifndef __MLX90614_H
#define __MLX90614_H/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "gpio.h"
#include "tim.h"
/* Exported types ------------------------------------------------------------*/
/* Exported variables --------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/* Exported macro ------------------------------------------------------------*/
/* Exported functions ------------------------------------------------------- */
void SMBus_StartBit(void);
void SMBus_StopBit(void);
void SMBus_SendBit(u8);
u8 SMBus_SendByte(u8);
u8 SMBus_ReceiveBit(void);
u8 SMBus_ReceiveByte(u8);
void SMBus_Delay(u16);
void SMBus_Init(void);
u16 SMBus_ReadMemory(u8, u8);
u8 PEC_Calculation(u8*);
float SMBus_ReadTemp(void); //»ñÈ¡ÎÂ¶ÈÖµ#endif

实际效果

非常灵敏
不愧是红外

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GY906 温度的传感器

目录

外形

注意事项

代码

main

.c

.h

实际效果

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