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arduino-cli/libraries/Adafruit_HTU21DF_Soft/Adafruit_HTU21DF_Soft.cpp

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+/***************************************************
+  This is a library for the HTU21DF Humidity & Temp Sensor
+
+  Designed specifically to work with the HTU21DF sensor from Adafruit
+  ----> https://www.adafruit.com/products/1899
+
+  These displays use I2C to communicate, 2 pins are required to
+  interface
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit and open-source hardware by purchasing
+  products from Adafruit!
+
+  Written by Limor Fried/Ladyada for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+#include "Adafruit_HTU21DF_Soft.h"
+#include <SoftwareWire.h>
+#if defined(__AVR__)
+#include <util/delay.h>
+#endif
+
+/**
+* Constructor for the HTU21DF driver.
+ */
+Adafruit_HTU21DF_Soft::Adafruit_HTU21DF_Soft()
+{
+    /* Assign default values to internal tracking variables. */
+    _last_humidity = 0.0f;
+    _last_temp = 0.0f;
+}
+
+/**
+ * Initialises the I2C transport, and configures the IC for normal operation.
+ *
+ * @return true (1) if the device was successfully initialised, otherwise
+ *         false (0).
+ */
+boolean Adafruit_HTU21DF_Soft::begin(SoftwareWire *theWire)
+{
+    _wire = theWire;
+    _wire->begin();
+
+    reset();
+
+    _wire->beginTransmission(HTU21DF_I2CADDR);
+    _wire->write(HTU21DF_READREG);
+    _wire->endTransmission();
+    _wire->requestFrom(HTU21DF_I2CADDR, 1);
+    return (_wire->read() == 0x2); // after reset should be 0x2
+}
+
+/**
+ * Sends a 'reset' request to the HTU21DF, followed by a 15ms delay.
+ */
+void Adafruit_HTU21DF_Soft::reset(void)
+{
+    _wire->beginTransmission(HTU21DF_I2CADDR);
+    _wire->write(HTU21DF_RESET);
+    _wire->endTransmission();
+    delay(15);
+}
+
+/**
+ * Performs a single temperature conversion in degrees Celsius.
+ *
+ * @return a single-precision (32-bit) float value indicating the measured
+ *         temperature in degrees Celsius.
+ */
+float Adafruit_HTU21DF_Soft::readTemperature(void)
+{
+    // OK lets ready!
+    _wire->beginTransmission(HTU21DF_I2CADDR);
+    _wire->write(HTU21DF_READTEMP);
+    _wire->endTransmission();
+
+    delay(50); // add delay between request and actual read!
+
+    uint8_t count = _wire->requestFrom(HTU21DF_I2CADDR, 3);
+
+    /* Make sure we got 3 bytes back. */
+    if (count != 3) {
+        return 0.0f;
+    }
+
+    /* Read 16 bits of data, dropping the last two status bits. */
+    uint16_t t = _wire->read();
+    t <<= 8;
+    t |= _wire->read() & 0b11111100;
+
+    uint8_t crc = _wire->read();
+    (void)crc;
+
+    float temp = t;
+    temp *= 175.72f;
+    temp /= 65536.0f;
+    temp -= 46.85f;
+
+    /* Track the value internally in case we need to access it later. */
+    _last_temp = temp;
+
+    return temp;
+}
+
+/**
+ * Performs a single relative humidity conversion.
+ *
+ * @return A single-precision (32-bit) float value indicating the relative
+ *         humidity in percent (0..100.0%).
+ */
+float Adafruit_HTU21DF_Soft::readHumidity(void) {
+    /* Prepare the I2C request. */
+    _wire->beginTransmission(HTU21DF_I2CADDR);
+    _wire->write(HTU21DF_READHUM);
+    _wire->endTransmission();
+
+    /* Wait a bit for the conversion to complete. */
+    delay(50);
+
+    /* Read the conversion results. */
+    uint8_t count = _wire->requestFrom(HTU21DF_I2CADDR, 3);
+
+    /* Make sure we got 3 bytes back. */
+    if (count != 3) {
+        return 0.0f;
+    }
+
+    /* Read 16 bits of data, dropping the last two status bits. */
+    uint16_t h = _wire->read();
+    h <<= 8;
+    h |= _wire->read() & 0b11111100;
+
+    uint8_t crc = _wire->read();
+    (void)crc;
+
+    float hum = h;
+    hum *= 125.0f;
+    hum /= 65536.0f;
+    hum -= 6.0f;
+
+    /* Track the value internally in case we need to access it later. */
+    _last_humidity = hum;
+
+    return hum;
+}

arduino-cli/libraries/Adafruit_HTU21DF_Soft/Adafruit_HTU21DF_Soft.h

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+/***************************************************
+  This is a library for the HTU21D-F Humidity & Temp Sensor
+
+  Designed specifically to work with the HTU21D-F sensor from Adafruit
+  ----> https://www.adafruit.com/products/1899
+
+  These displays use I2C to communicate, 2 pins are required to
+  interface
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit and open-source hardware by purchasing
+  products from Adafruit!
+
+  Written by Limor Fried/Ladyada for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+#ifndef _ADAFRUIT_HTU21DF_H
+#define _ADAFRUIT_HTU21DF_H
+
+#if (ARDUINO >= 100)
+ #include "Arduino.h"
+#else
+ #include "WProgram.h"
+#endif
+#include <SoftwareWire.h>
+
+/** Default I2C address for the HTU21D. */
+#define HTU21DF_I2CADDR         (0x40)
+
+/** Read temperature register. */
+#define HTU21DF_READTEMP        (0xE3)
+
+/** Read humidity register. */
+#define HTU21DF_READHUM         (0xE5)
+
+/** Write register command. */
+#define HTU21DF_WRITEREG        (0xE6)
+
+/** Read register command. */
+#define HTU21DF_READREG         (0xE7)
+
+/** Reset command. */
+#define HTU21DF_RESET           (0xFE)
+
+/**
+ * Driver for the Adafruit HTU21DF breakout board.
+ */
+class Adafruit_HTU21DF_Soft {
+    public:
+        Adafruit_HTU21DF_Soft();
+
+        boolean begin(SoftwareWire *theWire);
+        float   readTemperature(void);
+        float   readHumidity(void);
+        void    reset(void);
+
+    private:
+        SoftwareWire *_wire;
+        boolean readData(void);
+        float _last_humidity, _last_temp;
+};
+
+#endif /* _ADAFRUIT_HTU21DF_H */