Diff: main.cpp

Revision:

0:f7ac3f4062cf

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Oct 12 02:44:32 2014 +0000
@@ -0,0 +1,71 @@
+//**********************
+// Barometer and Altimeter
+// LPS25H sample for mbed
+//
+// LPC1768 flash=512KB, ADC=12bits
+// LPC11U35 flash=64KB, ADC=10bits
+// Nucleo ADC=12bits
+//
+// (C)Copyright 2014 All rights reserved by Y.Onodera
+// http://einstlab.web.fc2.com
+//**********************
+#include "mbed.h"
+#include "AQM0802.h"
+#include "LPS25H.h"
+
+#if defined(TARGET_LPC1768)
+I2C i2c(p28,p27);
+#endif
+// for TG-LPC11U35-501
+#if defined(TARGET_LPC11U35_501)
+I2C i2c(P0_5,P0_4);
+#endif
+// for Nucleo
+#if defined(TARGET_NUCLEO_F401RE)
+I2C i2c(D14,D15);
+#endif
+
+AQM0802 lcd(i2c);
+LPS25H lps25h(i2c);
+
+#define T0  288.15
+#define dT  0.0065
+#define P0  101325.0
+#define g   9.80665
+#define R   287.052
+double GetAltitude(double p, double t){
+
+    return (t+273.15)/dT*(pow((P0/p),dT*R/g)-1);
+
+}
+
+int main() {
+    
+    char msg[10];
+    int p, t, a;
+
+    sprintf(msg,"Barometer");
+    lcd.locate(0,0);
+    lcd.print(msg);
+    sprintf(msg,"Altimeter");
+    lcd.locate(0,1);
+    lcd.print(msg);
+    wait(1);
+      
+    while(1) {
+
+        p = (double)lps25h.pressure()/40.96;
+        t = 42.5 + (double)lps25h.temperature()/480.0;
+        a = GetAltitude(p,t);
+
+        sprintf(msg,"%6dPa",p);
+        lcd.locate(0,0);
+        lcd.print(msg);
+        sprintf(msg,"%4dm%2dC", a, t);
+        lcd.locate(0,1);
+        lcd.print(msg);
+        wait(1);
+    }
+
+}
+