Diff: main.cpp

Revision:

0:924cb994fc16

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Oct 20 16:49:21 2016 +0000
@@ -0,0 +1,86 @@
+#include "mbed.h"
+#include "MPL3115A2.h"
+#include "htu21d.h"
+
+
+I2C i2c(I2C_SDA, I2C_SCL);       // sda, scl
+Serial pc(USBTX, USBRX); // tx, rx
+MPL3115A2 mpl(&i2c, &pc);
+htu21d htu(i2c);
+DigitalOut bled(PTC3);
+DigitalOut gled(PTC12);
+AnalogIn light(A1);
+AnalogIn lightref(A3);
+
+float readLightSensor(AnalogIn sig, AnalogIn ref);
+
+int main() {
+    pc.baud(115200);
+    wait_ms(300);
+    gled.write(1);
+    bled.write(1);
+
+ 
+    pc.printf("** Temperature Shield **\r\n");
+ 
+ 
+    // Initialize the MPL3115A2 pressure and temp.
+    Temperature t;
+    Pressure p;
+    
+    mpl.init();
+    pc.printf("MPL3115A2 ID: 0x%X\r\n", mpl.whoAmI());
+    // Offsets for Dacula, GA
+    mpl.setOffsetTemperature(20);
+    mpl.setOffsetPressure(-32);
+   
+   
+     //initialize the HTU21D humidity and temp.
+    float H21Temp = 0.0;                      //Temperture from HTU21D
+    float H21Hum = 0.0;                       //Humidity from HTU21D
+    int htu21 = htu.softReset();
+    if(htu21 == 0){
+        pc.printf(" - HTU21D broken...\r\n");
+    } 
+    else{
+         uint8_t HTU21DuserReg = htu.getUserReg();
+         pc.printf("HTU21D UserReg: 0x%02x   SN: 0x%04x %08x %04x\r\n", 
+                   HTU21DuserReg, htu.HTU21sn.HTU21D_sna, htu.HTU21sn.HTU21D_snb, htu.HTU21sn.HTU21D_snc);
+    }
+    
+    //main loop
+    while(1) 
+    {   
+        //read mpl
+        bled = 0;
+        wait(1);
+        mpl.readTemperature(&t);
+        mpl.readPressure(&p);
+        bled = 1;
+        pc.printf("Temp: %s C, Pressure: %sPa \r\n", t.print(), p.print());
+
+        //read htu
+        gled = 0;
+        wait(1);
+        if(htu21 == 1) {    //if HTU21D didn't initialize, don't access HTU21D anymore
+            H21Hum = htu.getHum();
+            if((double)H21Hum == 255.0) pc.printf("\r\n*** HTU21D Hum error!!\r\n");
+            H21Temp = htu.getTemp();
+            if((double)H21Temp == 255.0) pc.printf("\r\n*** HTU21D Temp error!!\r\n");
+        }
+        gled = 1;
+        pc.printf("Temp: %7.2f C   Hum: %4.1f %% \r\n ", H21Temp, H21Hum);
+        
+        //read photoresistor
+        wait(1);
+        float lightLvl = readLightSensor(light,lightref);
+        pc.printf("Light: %3.2f \r\n", lightLvl);
+
+    }
+}
+
+float readLightSensor(AnalogIn sig, AnalogIn ref){
+    float opVoltage = 3.3/ref.read();
+    float lightSen = opVoltage *sig.read();
+    return lightSen;
+    }
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