c - 使用 C 编程语言对 XM1000 传感器设备进行编程 需要 if 语句

Question

我正在对传感器节点 (XM1000) 进行编程，我正在使用 Contiki 操作系统对该设备进行编程(我正在使用终端查看输出，并使用 GEdit 写入我的“C”代码。该传感器节点具有温度、光照板载湿度传感器以及 3 个 LED 灯。

下面我有两组代码。第一组代码起作用并为我提供温度、光照和湿度值的传感器读数。

第二组代码函数。它打开/关闭 LED 灯并使其在传感器节点 XM1000 上定期闪烁，计算 LED 闪烁的次数并将计数输出到控制台。

我遇到的问题是创建一个 if 语句来满足以下条件，并且我正在努力将两个代码组合在一起。这就是我想要实现的目标:

• 如果温度超过 26 度，则打开 LED 灯 1 5 秒，否则，如果温度等于或低于 26 度，则关闭 LED 灯 1。

• 如果湿度超过 40%，则打开 LED 灯 2 5 秒，否则，如果湿度等于或低于 40%，则关闭 LED 灯 2。

• 如果光强度超过 510 纳米，则打开 LED 灯 3 5 秒，否则如果光强度等于或低于 510 纳米，则关闭 LED 灯 3。

第一组代码:它测量温度、光照和湿度，并将结果输出到终端窗口上。

    #include "contiki.h" //Contiki Header File 
    #include "dev/light-sensor.h" //Light Sensor Header File 
    #include "dev/sht11-sensor.h" //Temperature and Humidity Header File 

    #include <stdio.h> /* for printf() */ // standard input/output library needed to write to the standard output

    static struct etimer timer; //Process Requires a Timer 
    int light=0, temp=0, humid=0;

    //To Start

    /*___________________________________________________*/

    PROCESS(sensor_reading_process, "Sensor Reading Process");
    AUTOSTART_PROCESSES(&sensor_reading_process);

    /*___________________________________________________*/

    //PROCESS BEGINS 

    PROCESS_THREAD(sensor_reading_process, ev, data)
   {
     PROCESS_BEGIN();

     SENSORS_ACTIVATE(light_sensor); //Activate the Light Sensor
     SENSORS_ACTIVATE(sht11_sensor);//Activate Temp/Humidity Sensor

     etimer_set(&timer, CLOCK_CONF_SECOND);//Configuring Timer 1SEC

     while(1) {  //Start of While Loop 

     PROCESS_WAIT_EVENT_UNTIL(ev==PROCESS_EVENT_TIMER);//Wait4Time


    // This is how we get the Sensor Values for light, temp, hum
    light = light_sensor.value(LIGHT_SENSOR_PHOTOSYNTHETIC);
    temp = sht11_sensor.value(SHT11_SENSOR_TEMP);
    humid = sht11_sensor.value(SHT11_SENSOR_HUMIDITY);

    printf("Light=%d, Temp=%d, Humid=%d\n", light, temp, humid); 
    //Above Line if Print Plus Values 
    etimer_reset(&timer); //Reset the Timer 

    }

    PROCESS_END(); //End of Process
     }

第二个代码:

    #include "contiki.h" 
    #include "leds.h"  // LED HEADER FILE 
    #include <stdio.h> /* for printf() */ 
    static struct etimer timer; 
    /*____________________________________________________*/ 
    PROCESS(led_blinking_process, "LED Blinking Process"); 
    PROCESS(LED_process, "LED process"); 
    AUTOSTART_PROCESSES(&LED_process); 
    /*____________________________________________________*/ 


     PROCESS_THREAD(LED_process, ev, data) 
     { 
     static int count = 0; 
     PROCESS_BEGIN(); 
     etimer_set(&timer, CLOCK_CONF_SECOND/2); // 0.5S timer 
     leds_init(); // initialise the LEDs 
     while(1) { 
     PROCESS_WAIT_EVENT_UNTIL(ev==PROCESS_EVENT_TIMER); // wait for timer             event 
    count++; // count the blinking times 
    process_start(&led_blinking_process, NULL); // to blink the BLUE Led 
    printf("Count: %d\n", count); // output the counter number to console 
    etimer_reset(&timer); // reset the timer 
    } 
    PROCESS_END(); 
    } 


    CODE FOR LED LIGHTS 

    /*____________________________________________________*/ 
    PROCESS_THREAD(led_blinking_process, ev, data) 
    { 
    PROCESS_BEGIN(); 
    leds_toggle(LEDS_BLUE); // Blinking the Blue LED 
    PROCESS_END(); 
    }

请注意，当我运行这两个代码时，它们都是有效的，我只是想将它们组合起来，使用 if 语句，这样我就可以满足我上面提到的功能。

预先感谢您的任何帮助或贡献!

Answer 1

这就是我认为它会是什么样子，给予或采取一点黑客攻击。我将代码构建为单个循环，仅以 5 秒的间隔轮询所有三个传感器。因此，每 5 秒，所有三个灯的开/关状态可能会发生变化。我认为浇草坪时，你并不需要瞬间精确地知道什么时候变热，什么时候变黑，或者什么时候。

根据您在OP评论部分的回复，可能需要完成一些涉及传感器读数返回值的计算。我认为在编译时进行计算可能更容易，因此代码是有偏见的。

#include <stdio.h> /* for printf() */ 

#include "contiki.h" 
#include "leds.h"
#include "dev/light-sensor.h"
#include "dev/sht11-sensor.h"

PROCESS(Led_management_process, "LED Management Process"); 
AUTOSTART_PROCESSES(&Led_management_process); 

static struct etimer Timer; 

/* Per the online docs at http://www.advanticsys.com/wiki/index.php?title=TestCM5000

     T = -39.6 + 0.01 × SO(T)

So, solving for SOt gives:
*/
#define degreesC(n) (n)

#define TEMP_D1 degreesC(-39.6)
#define TEMP_D2 degreesC(0.01)
#define TEMP_THRESHOLD(tempC) (int)(((((double)(tempC))-(TEMP_D1))/(TEMP_D2)))

#define TARGET_TEMP_READING  TEMP_THRESHOLD(degreesC(26))

#define LIGHT_LED LEDS_GREEN
#define HUM_LED   LEDS_BLUE
#define TEMP_LED  LEDS_RED

PROCESS_THREAD(Led_management_process, ev, data) 
{ 
    static int humidity_led_on = 0;
    static int light_led_on = 0;
    static int temp_led_on = 0;

    PROCESS_BEGIN();
    SENSORS_ACTIVATE(light_sensor);
    SENSORS_ACTIVATE(sht11_sensor);
    leds_init();

    unsigned int cycle = 0;

    while (1) {
        printf("%8u:", cycle);

        /* This part is questionable, since I don't know if the 
           sensors are guaranteed to return ints (vs. floats or
           something) and I don't know what units they use. */
        int temp = sht11_sensor.value(SHT11_SENSOR_TEMP);

        if (temp > TARGET_TEMP_READING) {
            printf(" TEMP warm- ");
            if (!temp_led_on) {
                printf("toggle LED");
                temp_led_on = 1;
                leds_toggle(TEMP_LED);
            }
            else {
                printf("LED is ok ");
            }
        }
        else {
            printf(" TEMP cold- ");
            if (temp_led_on) {
                printf("toggle LED");
                temp_led_on = 0;
                leds_toggle(TEMP_LED);
            }
            else {
                printf("LED is ok ");
            }
        }

        /* Code for humidity */
        /* Code for light */

        printf("\n");

        /* Sleep 5 seconds */
        etimer_set(&Timer, CLOCK_CONF_SECOND * 5);
        PROCESS_WAIT_EVENT_UNTIL(ev==PROCESS_EVENT_TIMER);
        etimer_reset(&Timer);
        ++cycle;
    }

    PROCESS_END(); 
}