一、SHT30介绍
1、简介
SHT30是一种数字湿度和温度传感器，由Sensirion公司生产。它是基于物理蒸发原理的湿度传感器，具有高精度和长期稳定性。SHT30采用I2C数字接口，可以直接与微控制器或其他设备连接。该传感器具有低功耗和快速响应的特点，能够在广泛的温度和湿度范围内准确测量。SHT30还具有内置的温度补偿功能，可以提供精确的湿度和温度测量结果。它广泛用于气象观测、室内环境监测、农业、工业自动化等领域。
2、引脚图
二、原理图
iic记得接上拉电阻哦
三、源码分享
1、iic.h
#ifndef _MYIIC_H
#define _MYIIC_H
#include "sys.h"//IO方向设置
#define SDA_IN() {GPIOG->MODER&=~(3<<(12*2));GPIOG->MODER|=0<<12*2;} //PH5输入模式
#define SDA_OUT() {GPIOG->MODER&=~(3<<(12*2));GPIOG->MODER|=1<<12*2;} //PH5输出模式
//IO操作
#define IIC_SCL(n) (n?HAL_GPIO_WritePin(GPIOG,GPIO_PIN_11,GPIO_PIN_SET):HAL_GPIO_WritePin(GPIOG,GPIO_PIN_11,GPIO_PIN_RESET)) //SCL
#define IIC_SDA(n) (n?HAL_GPIO_WritePin(GPIOG,GPIO_PIN_12,GPIO_PIN_SET):HAL_GPIO_WritePin(GPIOG,GPIO_PIN_12,GPIO_PIN_RESET)) //SDA
#define READ_SDA HAL_GPIO_ReadPin(GPIOG,GPIO_PIN_12) //输入SDA//IIC所有操作函数
void IIC_Init(void); //初始化IIC的IO口
void IIC_Start(void); //发送IIC开始信号
void IIC_Stop(void); //发送IIC停止信号
void IIC_Send_Byte(u8 txd); //IIC发送一个字节
u8 IIC_Read_Byte(unsigned char ack);//IIC读取一个字节
u8 IIC_Wait_Ack(void); //IIC等待ACK信号
void IIC_Ack(void); //IIC发送ACK信号
void IIC_NAck(void); //IIC不发送ACK信号void IIC_Write_One_Byte(u8 daddr,u8 addr,u8 data);
u8 IIC_Read_One_Byte(u8 daddr,u8 addr);
#endif2、iic.c
#include "myiic.h"
#include "delay.h"//IIC初始化
void IIC_Init(void)
{GPIO_InitTypeDef GPIO_Initure;__HAL_RCC_GPIOG_CLK_ENABLE(); //使能GPIOH时钟//PH4,5初始化设置GPIO_Initure.Pin=GPIO_PIN_11|GPIO_PIN_12;GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP; //推挽输出GPIO_Initure.Pull=GPIO_PULLUP; //上拉GPIO_Initure.Speed=GPIO_SPEED_FREQ_VERY_HIGH; //快速HAL_GPIO_Init(GPIOG,&GPIO_Initure);IIC_SDA(1);IIC_SCL(1);
}//产生IIC起始信号
void IIC_Start(void)
{SDA_OUT(); //sda线输出IIC_SDA(1); IIC_SCL(1);delay_us(4);IIC_SDA(0);//START:when CLK is high,DATA change form high to low delay_us(4);IIC_SCL(0);//钳住I2C总线，准备发送或接收数据
}
//产生IIC停止信号
void IIC_Stop(void)
{SDA_OUT();//sda线输出IIC_SCL(0);IIC_SDA(0);//STOP:when CLK is high DATA change form low to highdelay_us(4);IIC_SCL(1); IIC_SDA(1);//发送I2C总线结束信号delay_us(4);
}
//等待应答信号到来
//返回值：1，接收应答失败
// 0，接收应答成功
u8 IIC_Wait_Ack(void)
{u8 ucErrTime=0;SDA_IN(); //SDA设置为输入 IIC_SDA(1);delay_us(1); IIC_SCL(1);delay_us(1); while(READ_SDA){ucErrTime++;if(ucErrTime>250){IIC_Stop();return 1;}}IIC_SCL(0);//时钟输出0 return 0;
}
//产生ACK应答
void IIC_Ack(void)
{IIC_SCL(0);SDA_OUT();IIC_SDA(0);delay_us(2);IIC_SCL(1);delay_us(2);IIC_SCL(0);
}
//不产生ACK应答
void IIC_NAck(void)
{IIC_SCL(0);SDA_OUT();IIC_SDA(1);delay_us(2);IIC_SCL(1);delay_us(2);IIC_SCL(0);
}
//IIC发送一个字节
//返回从机有无应答
//1，有应答
//0，无应答
void IIC_Send_Byte(u8 txd)
{ u8 t; SDA_OUT(); IIC_SCL(0);//拉低时钟开始数据传输for(t=0;t<8;t++){ IIC_SDA((txd&0x80)>>7);txd<<=1; delay_us(2); //对TEA5767这三个延时都是必须的IIC_SCL(1);delay_us(2); IIC_SCL(0); delay_us(2);}
}
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
u8 IIC_Read_Byte(unsigned char ack)
{unsigned char i,receive=0;SDA_IN();//SDA设置为输入for(i=0;i<8;i++ ){IIC_SCL(0); delay_us(2);IIC_SCL(1);receive<<=1;if(READ_SDA)receive++; delay_us(1); } if (!ack)IIC_NAck();//发送nACKelseIIC_Ack(); //发送ACK return receive;
}3、sht30.h
#ifndef __SHT30_H
#define __SHT30_H
#include "sys.h"
#include "myiic.h"#define SHT30_State 0xF32D#define CMD_CLEAR_STATUS 0x3041 // clear status register
#define CMD_HEATER_ENABLE 0x306D // enabled heater
#define CMD_HEATER_DISABLE 0x3066 // disable heater
#define CMD_MEAS_CLOCKSTR_H 0x2C06
#define CMD_MEAS_POLLING_H 0x2400
#define POLYNOMIAL 0x131 // P(x) = x^8 + x^5 + x^4 + 1 = 100110001// Generator polynomial for CRCvoid sht30_init(uint8_t slaveAddr);
uint8_t sht30_read_data(uint8_t slaveAddr,uint16_t mode,uint16_t *temp,uint16_t *humid);#endif4、sht30.c
#include "sht30.h"
#include "delay.h"//SHT30写命令
void sht30_write_cmd(uint8_t slaveAddr,uint16_t cmd)
{IIC_Start();IIC_Send_Byte(slaveAddr << 1);IIC_Wait_Ack();IIC_Send_Byte(cmd >> 8);IIC_Wait_Ack();IIC_Send_Byte(cmd);IIC_Wait_Ack();IIC_Stop();
}uint8_t sht30_calc_crc(uint8_t data[], uint8_t Bytes)
{uint8_t bit; // bit maskuint8_t crc = 0xFF; // calculated checksumuint8_t byteCtr; // byte counter// calculates 8-Bit checksum with given polynomialfor(byteCtr = 0; byteCtr < Bytes; byteCtr++){crc^= (data[byteCtr]);for(bit = 8; bit > 0; --bit){if(crc & 0x80) crc = (crc << 1) ^ POLYNOMIAL;else crc = (crc << 1);}}return crc;
}uint8_t sht30_check_crc(uint8_t data[], uint8_t Bytes, uint8_t checksum)
{uint8_t crc; // calculated checksum// calculates 8-Bit checksumcrc = sht30_calc_crc(data, Bytes);// verify checksumif(crc != checksum) return 0;else return 1;
}//读SHT30状态uint16_t sht30_read_state(uint8_t slaveAddr)
{uint8_t temp[2],crc;uint16_t sta;IIC_Start();IIC_Send_Byte(slaveAddr << 1);IIC_Wait_Ack();IIC_Send_Byte(SHT30_State >> 8);IIC_Wait_Ack();IIC_Send_Byte((u8)SHT30_State);IIC_Wait_Ack();IIC_Start();IIC_Send_Byte(slaveAddr << 1 | 0x01);IIC_Wait_Ack();temp[0] = IIC_Read_Byte(1);//高位temp[1] = IIC_Read_Byte(1);//低位crc = IIC_Read_Byte(0);//校验IIC_Stop();if(sht30_check_crc(temp,2,crc)){sta = temp[0] << 8 | temp[1];return sta;}elsereturn 0;
}
float sht30_calc_temperature(uint16_t rawValue)
{
// calculate temperature [°C]
// T = -45 + 175 * rawValue / (2^16-1)return 175.0f * (float)rawValue / 65535.0f - 45.0f;
}
float sht30_calc_humidity(u16 rawValue)
{
// calculate relative humidity [%RH]
// RH = rawValue / (2^16-1) * 100return 100.0f * (float)rawValue / 65535.0f;
}//读取SHT30数据uint8_t sht30_read_data(uint8_t slaveAddr,uint16_t mode,uint16_t *temp,uint16_t *humid)
{uint8_t temp1[2],crc1,temp2[2],crc2;uint16_t tempValue;sht30_write_cmd(slaveAddr,mode); //发送测量模式命令，并开始测量//delay_ms(5);//No Clock Stretching 模式下传感器对第一次微控制器发送的I2CStart() 是没有 ACK的 IIC_Start(); IIC_Send_Byte(slaveAddr << 1 | 0x01);IIC_Stop();delay_ms(50);//第二次微控制器发送的I2CStart()数据采集转换完成 有ACKIIC_Start();IIC_Send_Byte(slaveAddr << 1 | 0x01);IIC_Wait_Ack();temp1[0] = IIC_Read_Byte(1);//温度高位temp1[1] = IIC_Read_Byte(1);//温度低位crc1 = IIC_Read_Byte(1);//温度CRC校验值temp2[0] = IIC_Read_Byte(1);//湿度高位temp2[1] = IIC_Read_Byte(1);//湿度低位crc2 = IIC_Read_Byte(0);//湿度CRC校验值IIC_Stop();//CRC 校验uint8_t tempCheck = sht30_check_crc(temp1,2,crc1);uint8_t humCheck = sht30_check_crc(temp2,2,crc2);if(tempCheck){tempValue = temp1[0];tempValue <<= 8;tempValue |= temp1[1];*temp = sht30_calc_temperature(tempValue) * 10; //精度0.3°tempValue = temp2[0];tempValue <<= 8;tempValue |= temp2[1];*humid = sht30_calc_humidity(tempValue);//精度 %2return 1;}elsereturn 0;
}void sht30_init(uint8_t slaveAddr)
{}
