ICP备案证书号:粤ICP备12082730号-1

湿度传感器电气参数 | |
---|---|
[传感器供电电压] | 3.3V |
[传感器功耗] | 150uW |
[传感器输出方式] | IIC |
[传感器湿度响应时间] | 8s(tau63%) |
[传感器温度响应时间] | 5~30s |
湿度传感器性能参数 | |
[传感器湿度测量范围] | 0-100%RH |
[传感器湿度灵敏度] | 0.05%RH |
[传感器湿度测量精度] | ±4.5%RH |
[传感器温度测量范围] | -40~+125℃ |
[传感器温度灵敏度] | 0.01°C |
[传感器温度测量精度] | ±0.5℃ |
[传感器工作温度范围] | -40~+125 °C |
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#define DATA P1_1
#define SCK P1_0
#define ACK 1
#define noACK 0
#define MEASURE_TEMP 0x03 //测量温度命令
#define MEASURE_HUMI 0x05 //测量湿度命令
//读温湿度数据
char s-measure(unsigned char *p- value, un-signed char *p_checksum, unsigned char mode)
{
unsigned char error=0;
unsigned int i;
s_transstart(); //传输开始
switch(mode){
case
TEMP:error+=s_write_byte(measure_temp);
break;
case
HUMI:error+=s_write_byte(measure_humi);break;
default:break;
}
for(i=0;i<65535;i++) if(DATA==0) break;
if (DATA) reeor+=1;
*(p_value)=s_read_byte(ACK);
*(p_value+1)=s_read_byte(ACK);
*p_checksum=s_read_byte(noACK);
return error;
}
//温湿度值标度变换及温度补偿
void calc_sth15(float *p_humidity,float *p_tempera-ture)
{
const float c1=-4.0;
const float c2=0.0405;
const float c3=-0.0000028;
const float t1=-0.01;
const float t2=0.00008;
float rh=×p_humidity;
float t=×p_temperature;
float rh_lin;
float th_ture;
float t_c;
t_c=t×0.01-40;
rh_lin=c3×rh×rh+c2×rh+c1;
trh_ture=(t_c-25)×(t1+t2×rh)+rh_lin;
×p_temperature=t-c;
×p_humidity=rh_ture;
}
//从相对温度和湿度计算露点
char calc_dewpoint(float h,float t)
{float logex,dew_point;
logex=0.66077+7.5×t/(237.3+t)+[log10(h)-2];
dew_point=(logex-0.66077)×237.3/(0.66077+7.5-logex);
return dew_point;
}
求温湿度传感器SHT11的源程序(51单片机语言)