Diff: SHT.h

Revision:

0:df1c8f2961a1

Child:

1:0dbbb4802508

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SHT.h	Sun Jan 24 22:00:35 2010 +0000
@@ -0,0 +1,66 @@
+/* mbed module to use a Sensirion SHT1x /SHT7x sensor
+ * Copyright (c) 2007-2009 Stephen McGarry
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+#ifndef SHT_H
+#define SHT_H
+
+#include "mbed.h"
+
+enum SHT_acc {
+    SHT_low=0,
+    SHT_high=1
+};
+
+typedef unsigned char byte;
+
+class SHT : public Base {
+public:
+    /* Constructor: SHT
+     *  Creates an SHT interface connected to specific pins.
+     *
+     */
+    SHT(PinName p_sclk, PinName p_data, SHT_acc p_accuracy);
+
+    /* Functions
+     */
+    float get_temperature();     // get the most recent temp reading
+    float get_humidity();        // get the most recent humidity reading
+    float get_dewpoint();        // get the most recent dewpoint value
+    void update(SHT_acc accuracy); // update stored values from sensor
+
+protected:
+    byte read_byte(bool send_ack);
+    char write_byte(byte value);
+    void trans_start(void);
+    void connection_reset(void);
+    char soft_reset();
+    char read_status(byte &value);
+    char write_status(byte value);
+    char measure(int &value, byte mode);
+    void calculate();
+
+    DigitalOut sclk;
+    DigitalInOut data;
+    SHT_acc accuracy;    // will we use high or low accuracy mode on the sensor
+
+    float temperature;    // calculated from sensor reading
+    float humidity;
+    float dewpoint;
+    int temp,hum;        // integer values from sensor before conversion
+
+    enum commands {
+        com_read_status_reg=0x06,
+        com_write_status_reg=0x07,
+        com_measure_temp=0x03,
+        com_measure_humid=0x05,
+        com_reset=0x1E
+    };
+
+    enum acks {
+        no_ack=0,
+        send_ack=1
+    };
+};
+
+#endif
\ No newline at end of file