sensor.h

00001 #include "MicroduinoPinNames.h"
00002 #include "Config.h"
00003 #include "AM2321.h"
00004 
00005 extern Serial pc;
00006 extern Timer g_MainTimer;
00007 #define INTERVAL_pm25    200
00008 
00009 //SoftwareSerial pmSerial(4,5);   //PM2.5传感器通讯软串口
00010 #ifdef OPEN_PM25
00011 Serial pmSerial(D5, D4); //tx,rx
00012 #endif
00013 AnalogIn gLight(A0);
00014 AnalogIn gCH4(A2);
00015 AM2321 am2321;
00016 
00017 float sensor_tem,sensor_hum,sensor_light,Sensor_etoh;
00018 
00019 float sensorPM25 = 0.6;
00020 
00021 long map(long x, long in_min, long in_max, long out_min, long out_max)
00022 {
00023     return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
00024 }
00025 
00026 #ifdef OPEN_PM25
00027 void PM25_init(void)
00028 {
00029     //pc.printf("Enter PM25_init\r\n");
00030     pmSerial.baud(2400);
00031 }
00032 
00033 // 读取PM2.5传感器
00034 void PM25()
00035 {
00036     //pc.printf("Enter PM25()\r\n");
00037     int data_s = 0;    //串口接收数据
00038     int num = -1;      //串口接收数据计数
00039     int sum = 0;       //校验和
00040     int cal[6];        //接收数据缓存
00041     float dustDensity = 0;  //PM2.5浓度
00042 
00043     //pmSerial.begin(2400);   //首先启动软串口
00044     //pmSerial.baud(2400);
00045     //pmSerial.flush();       //清空串口缓存
00046 
00047     uint32_t start = g_MainTimer.read_ms();
00048     while(true) {//避免无限循环
00049         uint32_t nowTime = g_MainTimer.read_ms();
00050         if (nowTime - start > 100) {
00051             break;
00052         }
00053         //pc.printf("PM25:while(1)\r\n");
00054         //if(pmSerial.available() > 0) { //串口缓存有数据
00055         if (pmSerial.readable() > 0) {
00056         //if ((data_s = pmSerial.getc()) != 0) {
00057             //myled = 0;
00058             //pc.printf("readable() > 0\r\n");
00059             //data_s = pmSerial.read();   //读取串口缓存数据
00060             data_s = pmSerial.getc();
00061             if(data_s == 0xAA) {         //得到数据帧起始位
00062                 num = 0;                  //开始计数
00063             } else if(num >= 0) {
00064                 num++;                //读到数据，计数+1
00065                 cal[num-1] = data_s;  //数据保存到缓存中
00066                 if(num == 6) {         //读到数据帧最后一位
00067                     sum = cal[0] + cal[1] + cal[2] + cal[3];  //计算校验和
00068                     if(sum == cal[4] && cal[5] == 0xFF) {     //校验和匹配，数据帧最后一位为0xFF，说明接收的数据帧正常
00069                         dustDensity = (cal[0]*256 + cal[1])*(5.0/1024)*550;   //计算PM2.5浓度，单位ug/m3
00070                     } else {   //接收的数据不正常
00071                         dustDensity = 0;    //浓度清零
00072                     }
00073                     break;
00074                 }
00075             }
00076         }
00077     }
00078     //pmSerial.end();     //关闭软串口
00079     //return dustDensity; //返回值
00080     sensorPM25 = dustDensity;
00081     //pc.printf("sensorPM25 = %f\r\n", sensorPM25);
00082 }
00083 #endif
00084 
00085 #if 0
00086 // 读取光照传感器
00087 void updateLight()
00088 {
00089     //sensor_light = map(analogRead(A0), 0, 1023, 0, 255);
00090     //float lvf = gLight;
00091     int lt = (int)(gLight.read()*1024.0);
00092     
00093     //pc.printf("light = %d, lvf = %f\r\n", lt, lvf);
00094     sensor_light = map(lt, 0, 1024, 0, 255);// 这里和Arduino不一样，不知道为什么
00095     
00096 }
00097 #else
00098 void updateLight(void)
00099 {
00100     uint16_t lt = gLight.read_u16();
00101     pc.printf("lt0 = 0x%x, ", lt);
00102     lt = lt & 0x03FF;// 10bit
00103     //lt = lt >> 2;
00104     //lt = (lt & 0x0FFF)>>2;
00105     //lt = (lt >> 2) & 0x03FF;
00106     sensor_light = map(lt, 0, 1023, 0, 255);
00107     //sensor_light = map(lt, 0, 65535, 0, 65535);
00108     pc.printf("lt=0x%x, sensor_light=%f\r\n", lt, sensor_light);
00109     sensorPM25 += 1.0;
00110 }
00111 #endif
00112 
00113 // 读取甲醛传感器
00114 void updateCH4()
00115 {
00116     //Sensor_etoh = map(analogRead(A2), 0, 1023, 0, 30);
00117     uint16_t ch4 = gCH4.read_u16();
00118     //ch4 = ch4 & 0x03FF;
00119     //Sensor_etoh = map(ch4, 0, 1023, 0, 30);
00120     Sensor_etoh = map(ch4, 0, 65535, 0, 30);
00121     //pc.printf("CH4 = %d\r\n", ch4);
00122 }
00123 
00124 // 读取温湿度传感器
00125 void updateTempHumi(void)
00126 {
00127     static uint32_t lstTime = 0;
00128     uint32_t nowTime = g_MainTimer.read_ms();
00129     pc.printf("Enter updateTempHumi(), lstTime:%ums, nowTime:%u, cha:%u\r\n", lstTime, nowTime, nowTime - lstTime);
00130     if (nowTime - lstTime < 2000) {
00131         return;
00132     }
00133     am2321.read();
00134     sensor_tem = am2321.temperature / 10.0;
00135     sensor_hum = am2321.humidity / 10.0;
00136     //pc.printf("%u:temp = %.1f, hum = %.1f\r\n",cot, sensor_tem, sensor_hum);
00137     lstTime = g_MainTimer.read_ms();
00138 }