Diff: SHT1x.h

Revision:

0:ad72ec3d85e8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SHT1x.h	Thu Jun 21 03:56:43 2012 +0000
@@ -0,0 +1,83 @@
+/*
+ * mbed library to use a SENSIRION SHT1x/SHT7x sensor
+ * Copyright (c) 2011 Hiroshi Suga
+ * Released under the MIT License: http://mbed.org/license/mit
+ */
+ 
+/** @file
+ * @brief mbed library to use a SENSIRION SHT1x/SHT7x sensor
+ * humidity/temperature sensor SHT11, SHT15, SHT71, SHT75 (SENSIRION)
+ * interface: I2C digital
+ */
+ 
+#ifndef SHT1x_H
+#define SHT1x_H
+
+#include "mbed.h"
+
+/**
+ * @brief resolution setting
+ */
+enum SHT_acc {
+    SHT_low = 0, ///< RH 8bit, temp 12bit
+    SHT_high = 1, ///< RH 10bit, temp 14bit
+};
+
+enum SHT_vdd {
+    SHT_3V3 = 0,
+    SHT_5V = 1,
+};
+
+/**
+ * @brief SHT1x class
+ */
+class SHT1x : public Base {
+public:
+    /**
+     * @brief Initializes interface (private I2C)
+     * @param p_sda port of I2C SDA
+     * @param p_scl port of I2C SCL
+     * @param p_acc resolution setting
+     * @param p_vdd power
+     */
+    SHT1x(PinName p_sda, PinName p_scl, SHT_acc p_acc = SHT_high, SHT_vdd p_vdd = SHT_3V3);
+
+    /**
+     * @brief Initializes interface (public I2C)
+     * @param p_i2c instance of I2C class
+     * @param p_acc resolution setting
+     * @param p_vdd power
+     */
+    SHT1x(I2C& p_i2c, SHT_acc p_acc = SHT_high, SHT_vdd p_vdd = SHT_3V3);
+
+    /**
+     * @brief Get temperature
+     * @return temperature (`C)
+     */
+    float get_temperature();
+
+    /**
+     * @brief Get humidity
+     * @return humidity (%)
+     */
+    float get_humidity();
+
+    /**
+     * @brief Update results
+     */
+    void update();
+
+protected:
+    void init(SHT_acc p_acc, SHT_vdd p_vdd);
+    unsigned short twi_readshort (int addr, int wait);
+    void twi_writechar (int, int);
+
+    I2C i2c;
+    float humidity, temperature;
+
+private:
+    float d1, d2, c1, c2, c3, t1, t2;
+    enum SHT_acc accuracy;
+};
+
+#endif
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