Lora illumination sensor node data acquisition

One 、 Mission requirements

        Based on the temperature and humidity sensor node code , Development Lora Photosensitive node Application , Data collection required , After receiving the command of the gateway to read the sensor , Respond the sensing data to the gateway .

（1） Modify the device address , Define sensing variables .

// Define network number and device address 
#define MY_NET_ID  0xD0C2       // The Internet ID
#define MY_ADDR    0x02         // Device address 

/* Global variables */
uint16_t LightLux = 200;    // The illuminance collected by the light sensor , Company ：lux

（2） Response sending code , When string formatting output , take LightLux The sensor identification name is added .

 uint8_t RspBuf[BUFFER_SIZE]= {0};
        memset(RspBuf, '\0', BUFFER_SIZE);

        RspBuf[0]=START_HEAD;
        RspBuf[1]=CMD_READ;
        RspBuf[2]=(uint8_t)(MY_NET_ID>>8);
        RspBuf[3]=(uint8_t)MY_NET_ID;
        RspBuf[4]=MY_ADDR;
        RspBuf[5]=ACK_OK;
        sprintf((char *)(RspBuf+7),"LightLux(lux):%d", LightLux);// Data fields ,sprintf in , Two “%” Indicative output “%”.ADC Pass the value after collection LightLux send out .
        RspBuf[6]=strlen((const char *)(RspBuf+7))+1;// Data field length 
        RspBuf[6+RspBuf[6]]=CheckSum((uint8_t *)RspBuf, 6+RspBuf[6]);

        Radio.Send( RspBuf, 7+RspBuf[6]);// Send response data 
        GpioToggle( &Led1 );// Send data switching light 

（3）        initialization ADC：void AdcInit( Adc_t *obj, PinNames adcInput ) It's defined in adc.c in , The user can call ,board.c It defines Adc_t Adc; board.h Defined #define ADC_0   PA_0.

void PlatformInit(void)
{
    //  Development board platform initialization 
    BoardInitMcu();
    BoardInitPeriph();

    //  Development board device initialization 
    OLED_Init();// LCD initialization 
    USART1_Init(115200);// A serial port 1 initialization 
    OLED_Clear();
    OLED_InitView();//OLED The screen displays the initial information 

    printf(" Education in the new world  LoRa \r\n");

    //Lora Module initialization 
    NS_RadioInit( (uint32_t) RF_PING_PONG_FREQUENCY, (int8_t) TX_OUTPUT_POWER, (uint32_t) TX_TIMEOUT_VALUE, (uint32_t) RX_TIMEOUT_VALUE );

    // Please add user initialization code below 
    printf("LoRa Light\r\n");

    AdcInit( &Adc, ADC_0);//ADC Initialize channel 0

    Tim3McuInit(1);// Timer initialization , Set timing interrupt 1ms Break once 
    //IWDG_PrmInit(2048);// Independent watchdog initialization , The timeout is set to 2048ms
}

（4）ADC Data collection conversion report

void LoRa_GetSensorDataProcess(void)
{
    const uint16_t time = 1000;
    if(User0Timer_MS > time)
    {
        User0Timer_MS = 0;
        uint16_t AdcNum,voltage;

        AdcNum = AdcReadChannel( &Adc, ADC_CHANNEL_0 );//ADC precision 12 position , Reference voltage 3.3V
        // stay adc.c Define read ADC0 Value channel 

        voltage = AdcNum*3300/(4096-1.0);// Sensor voltage value , Company ：mV
        LightLux = (5/2.0)*(voltage/10.0);
        char StrBuf[64]={0};
        memset(StrBuf, '\0', 64);
        sprintf(StrBuf, " %d lux",LightLux);
        OLED_ShowString(0,4,(uint8_t *)StrBuf);
    }
}

（5） This experiment is improved in the temperature and humidity sensor node experiment , Please refer to the following connection for details ！https://blog.csdn.net/qq_41742056/article/details/125515371?spm=1001.2014.3001.5501