毕业设计
https://blog.csdn.net/GSH_Hello_World/article/details/72627990
******************************************************************接线*******************************************************************
传感器 VCC GND AO/DATA 描述
DHT11 3.3 PC7
亮度 3.3 PC2 模拟报警
MQ-2 5.0 PA4 范围0~5000 超过3000报警
PM2.5 5.0 PC4( LED PC6 ) 范围0~3000 超过1050报警
驱动风扇 5.0 ENA->PA3
IN1->PC3
IN2->PC5
*****************************************************************************************************************************************
DHT11
while(1)
{
if( Read_DHT11(&DHT11_Data)==SUCCESS)
{
printf("\r\n温度:%d.%d ℃ 湿度:%d.%d %RH\r\n",DHT11_Data.temp_int,DHT11_Data.temp_deci,DHT11_Data.humi_int,DHT11_Data.humi_deci);
}
else
{
printf("Read DHT11 ERROR\r\n");
}
Delay_ms(2000);
}
MQ2
while (1)
{
MQ2_Value = (float)MQ2_ADC_ConvertedValue/4096*3.3;
MQ2_PPM = (float)(((MQ2_Value - 1) / 0.1) * 200);
printf("\r\n The current AD value = 0x%04X \r\n",MQ2_ADC_ConvertedValue);
printf("\r\n The current AD value = %f V \r\n",MQ2_Value);
printf("\r\n The current AD value = %.2f ppm \r\n",MQ2_PPM);
printf("\r\n\r\n");
Delay_ms(2000);
}
PHOTORESISTOR
while (1)
{
PHOTORESISTOR_Value = (float)PHOTORESISTOR_ADC_ConvertedValue/4096*3.3;
PHOTORESISTOR_PPM = (float)(((PHOTORESISTOR_Value - 1) / 0.1) * 200);
printf("\r\n The current AD value = 0x%04X \r\n",PHOTORESISTOR_ADC_ConvertedValue);
printf("\r\n The current AD value = %f V \r\n",PHOTORESISTOR_Value);
printf("\r\n The current AD value = %.2f ppm \r\n",PHOTORESISTOR_PPM);
printf("\r\n\r\n");
Delay_ms(2000);
}
GP2Y1010AU0F灰尘传感器
图1为脉冲输入波形,周期为10ms,高电平为0.32ms
图2为AD采样时序,由图可知,在输入上升沿到输出的峰值,时间为280us左右,就在此时进行采样,因为整个高电平持续的时间为320us,
所以在打开红外发光二极管280us后采样,然后延时40us后关闭红外发光二极管,最后再延时9680us(输入波形的周期为10ms),这就实现了一次完整的工作
下图截自 datasheet,你可以看出粉尘传感器的输出电压是几乎呈线性的。dustDensity = 0.17 * calcVoltage - 0.1;
这个公式曲线近似转换过来的(来自Chris Nafis)。
这里dustDensity是粉尘密度值,单位mg/m3。calcVoltage是输出电压值。
while (1)
{
pm=Get_DUST_Average(10);
printf("\r\n The current AD value = 0x%04X \r\n",DUST_ADC_ConvertedValue);
printf("\t PM2.5 = %f ug/m3",(float)pm);
Delay_ms(500);
}
风扇
http://tieba.baidu.com/p/4238265567#81394034746l
风扇+极直接接在5v上,-极接在三极管集电极C。
三极管发射极E接0V,基极B接一个gpio
电容接在风扇-极和0v或5v两端,如果用电解电容注意极性。
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基于STM32单片机和无线网络技术设计和开发的一款智能空气监测系统
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基于STM32单片机和无线网络技术设计和开发的一款智能空气监测系统,可实时检测室内空气质量,例如:温湿度,亮度,烟雾浓度,PM2.5浓度,并且该系统具有自动报警和风扇多档位变速功能,用户可通过液晶显示屏和微信小程序实现人机交互。
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