Diff: sensor.h

Revision:

0:d8f4c441e032

Child:

1:0e75de2a5d21

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sensor.h	Fri Jun 10 15:20:20 2016 +0000
@@ -0,0 +1,85 @@
+//#include <SoftwareSerial.h>
+//#include <AM2321.h>
+#include "MicroduinoPinNames.h"
+
+#define INTERVAL_pm25             200
+unsigned long pm25_time = 0;
+
+//SoftwareSerial pmSerial(4,5);   //PM2.5传感器通讯软串口
+Serial pmSerial(D4, D5); //rx,tx
+AnalogIn gLight(A0);
+AnalogIn gCH4(A2);
+//AM2321 am2321;
+
+float sensor_tem,sensor_hum,sensor_light,
+      Sensor_etoh;
+
+float sensorPM25;
+
+long map(long x, long in_min, long in_max, long out_min, long out_max)
+{
+    return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+}
+
+// 读取PM2.5传感器
+float PM25()
+{
+    int data_s = 0;    //串口接收数据
+    int num = -1;      //串口接收数据计数
+    int sum = 0;       //校验和
+    int cal[6];        //接收数据缓存
+    float dustDensity = 0;  //PM2.5浓度
+
+    //pmSerial.begin(2400);   //首先启动软串口
+    pmSerial.baud(2400);
+    //pmSerial.flush();       //清空串口缓存
+
+    while(1) {
+        //if(pmSerial.available() > 0) { //串口缓存有数据
+        if (pmSerial.readable() > 0) {
+            //data_s = pmSerial.read();   //读取串口缓存数据
+            data_s = pmSerial.getc();
+            if(data_s == 0xAA) {         //得到数据帧起始位
+                num = 0;                  //开始计数
+            } else if(num >= 0) {
+                num++;                //读到数据，计数+1
+                cal[num-1] = data_s;  //数据保存到缓存中
+                if(num == 6) {         //读到数据帧最后一位
+                    sum = cal[0] + cal[1] + cal[2] + cal[3];  //计算校验和
+                    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
+                        dustDensity = (cal[0]*256 + cal[1])*(5.0/1024)*550;   //计算PM2.5浓度，单位ug/m3
+                    } else {   //接收的数据不正常
+                        dustDensity = 0;    //浓度清零
+                    }
+                    break;
+                }
+            }
+        }
+    }
+    //pmSerial.end();     //关闭软串口
+    return dustDensity; //返回值
+}
+
+// 读取光照传感器
+void updateLight()
+{
+    //sensor_light = map(analogRead(A0), 0, 1023, 0, 255);
+    sensor_light = map(gLight.read_u16(), 0, 65535, 0, 255);
+}
+
+// 读取甲醛传感器
+void updateCH4()
+{
+    //Sensor_etoh = map(analogRead(A2), 0, 1023, 0, 30);
+    Sensor_etoh = map(gCH4.read_u16(), 0, 65535, 0, 30);
+}
+
+// 读取温湿度传感器
+void updateTempHumi()
+{
+#if 0
+    am2321.read();
+    sensor_tem = am2321.temperature / 10.0;
+    sensor_hum = am2321.humidity / 10.0;
+#endif
+}