[第3期空气质量分析仪]第二周作业

发布于 2019-10-24 16:26:33 浏览：961 订阅该版

第二周：实现温湿度传感器应用、PM2.5传感器驱动与应用一.温度模块：上周完成了温度驱动，此次作业只需在application下，添加temp_humi_th.c线程任务就可以，创建线程定是采集温湿度信息，打印到串口。二.PM2.5传感器的驱动此处所选用的PM2.5传感器为GP2Y1010，依靠输出脉冲的高度来判断颗粒浓度。static void read_pm25_entry(void*parameter){    rt_uint8_t i=0;    float dust = 0.0f;    rt_uint16_t dust1,dust2;    for(;;)    {        for(i= 0; i < 6; i++)        {           rt_pin_write(PM25_LED_PIN,PIN_LOW);           rt_hw_us_delay(280);                      pm25_value += rt_adc_read(pm25_adc_dev,PM25_DEV_CHANNEL);           rt_hw_us_delay(40);           rt_pin_write(PM25_LED_PIN,PIN_HIGH);           rt_thread_mdelay(9);rt_hw_us_delay(680);           //rt_kprintf("PM2.5 ADC Value is :%d <br>",pm25_value);        }       pm25_value /= 5;        pm25_vol = pm25_value * PM25_REF_VOLTAGE / CONVERT_BITS;       //rt_kprintf("PM2.5 Voltage is :%d.%02d<br>",pm25_vol / 100,pm25_vol % 100);        dust= ((0.17f * pm25_vol - 0.1f) * 100000);        dust1= dust / 100;        dust2= (rt_uint16_t)(dust) % 1000;       LCD_ShowNum(82,224,dust1,3,24);       LCD_ShowNum(130,224,dust2,3,24);       rt_thread_delay(1000);    }}static int adc1_in7_init(void){   rt_pin_mode(PM25_LED_PIN,PIN_MODE_OUTPUT);   rt_pin_write(PM25_LED_PIN,PIN_LOW);    pm25_adc_dev =(rt_adc_device_t)rt_device_find(PM25_DEVICE_NAME);    if(pm25_adc_dev == RT_NULL)    {       rt_kprintf("ADC Run Failed! Can not Find %s Device <br>",PM25_DEVICE_NAME);       return RT_ERROR;    }    pm25_ret =rt_adc_enable(pm25_adc_dev,PM25_DEV_CHANNEL);    return pm25_ret;}INIT_COMPONENT_EXPORT(adc1_in7_init)；

static int pm25_sample(void){    static rt_thread_t thread15 =RT_NULL;    thread15 =rt_thread_create("pm2.5",                              read_pm25_entry,                              RT_NULL,                              1024,                              10,                              20);    if(thread10 != RT_NULL)    {       rt_thread_startup(thread10);    }    return RT_EOK;}INIT_APP_EXPORT(pm25_sample);