Diff: sht11.h

Revision:

0:56bbfad2d592

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sht11.h	Sun Apr 19 01:09:46 2015 +0000
@@ -0,0 +1,86 @@
+/**
+@file sht11.h
+
+@brief Header file containing member functions and variables
+
+*/
+
+#ifndef __SHT11_H__
+#define __SHT11_H__
+
+#include "mbed.h"
+
+/** 
+@brief Simple library for interfacing with Sensirion SHT11 
+
+@brief Revision 1.0
+
+@author Tim Meese
+@date   January 201
+ *
+ * Example:
+ * @code
+ 
+ #include "mbed.h"
+ #include "sht11.h"
+ 
+//        clk, dat
+ SHT11 sht(p7, p8);
+ 
+ int main() {
+    
+   // initialise display 
+  lcd.init();
+  // print a string in top-left corner
+  lcd.printString("Hello, World!",0,0);
+  // move cursor to 4th row
+  lcd.setXYAddress(0,3);
+  // print character
+  lcd.printChar('X');
+    
+  while(1);
+ }
+  
+ * @endcode
+ */
+ 
+class SHT11
+{
+
+private:
+    DigitalOut* clk;
+    DigitalInOut* data;
+    float lastTemperature;
+    float lastHumidity;
+
+    void sendTransmissionStart();
+    void connectionReset();
+    void softReset();
+    int writeByte(unsigned char writeData);
+    int readByte(unsigned char *pReadData, bool doAck);
+    int readStatus(unsigned char *pRetStatus);
+    int writeStatus(unsigned char writeValue);
+    int measureTemp(unsigned short *pRetTempRaw);
+    int measureHumid(unsigned short *pRetHumidRaw);
+    float convertTempCelsius(unsigned short rawTempIn);
+    float convertTempFahrenheit(unsigned short rawTempIn);
+    float convertHumid(unsigned short rawHumidIn, unsigned short rawTempIn);
+
+public:
+    /** Create a SHT11 object connected to the specified pins
+    *
+    * @param clkPin  Pin connected to clk
+    * @param dataPin Pin connected to data
+    * 
+    */
+    SHT11(PinName clkPin, PinName dataPin);
+    
+    /** Initialise SHT11
+    *
+    */
+    void init();
+    int getTemperature(float * pRetTemperature);
+    int getTempHumid(float * pRetTemperature, float * pRetHumidity);
+};
+
+#endif /* __SHT11_H__ */