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arduino-cli/libraries/Adafruit_HTU21DF/Adafruit_HTU21DF.cpp

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+/*!
+ * @file Adafruit_HTU21DF.cpp
+ *
+ * @mainpage Adafruit HTU21DF Sensor
+ *
+ * @section intro_sec Introduction
+ *
+ * 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!
+ *
+ * @section author Author
+ *
+ * Written by Limor Fried/Ladyada for Adafruit Industries.
+ *
+ * @section license License
+ *
+ * BSD license, all text above must be included in any redistribution
+ */
+
+#include "Adafruit_HTU21DF.h"
+
+#if defined(__AVR__)
+#include <util/delay.h>
+#endif
+
+/**
+ * Constructor for the HTU21DF driver.
+ */
+Adafruit_HTU21DF::Adafruit_HTU21DF() {
+  /* 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::begin(void) {
+  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::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::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::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/Adafruit_HTU21DF.h

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+/*!
+ * @file Adafruit_HTU21DF.h
+ */
+
+#ifndef _ADAFRUIT_HTU21DF_H
+#define _ADAFRUIT_HTU21DF_H
+
+#if (ARDUINO >= 100)
+#include "Arduino.h"
+#else
+#include "WProgram.h"
+#endif
+#include "Wire.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 {
+public:
+  Adafruit_HTU21DF();
+
+  boolean begin(void);
+  float readTemperature(void);
+  float readHumidity(void);
+  void reset(void);
+
+private:
+  boolean readData(void);
+  float _last_humidity, _last_temp;
+};
+
+#endif /* _ADAFRUIT_HTU21DF_H */

arduino-cli/libraries/Adafruit_HTU21DF/README.md

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+# Adafruit HTU21D-F Humidity/Temp Sensor for Arduino [![Build Status](https://github.com/adafruit/Adafruit_HTU21DF_Library/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_HTU21DF_Library/actions)[![Documentation](https://github.com/adafruit/ci-arduino/blob/master/assets/doxygen_badge.svg)](http://adafruit.github.io/Adafruit_HTU21DF_Library/html/index.html)
+
+![sensors_1899-00](https://user-images.githubusercontent.com/181073/46350691-b53d1880-c655-11e8-8415-452aec129b44.jpg)
+
+This is a library for the HTU21D-F Humidity + Temperature sensor.
+
+Designed specifically to work with the HTU21D-F in the Adafruit shop:
+
+- https://www.adafruit.com/products/1899
+
+These boards 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.
+
+## Installing this Library
+
+Check out the links above for our tutorials and wiring diagrams. Use the Arduino library manager to install
+
+We also have a great tutorial on Arduino library installation at:
+http://learn.adafruit.com/adafruit-all-about-arduino-libraries-install-use
+
+## Learning Guide and API Documentation
+
+### Learning Guide
+
+For a practical guide on how to use this breakout, see our comprehensive [Adafruit HTU21D-F Learning Guide](https://learn.adafruit.com/adafruit-htu21d-f-temperature-humidity-sensor/overview).
+
+### API Documentation
+
+> **NOTE:** This documentation is automatically generated based on the doxygen comments in the code.
+
+For specific programming issues, see the [API Documentation](http://adafruit.github.io/Adafruit_HTU21DF_Library/html/class_adafruit___h_t_u21_d_f.html) describing the `Adafruit_HTU21DF` class available in this library.

arduino-cli/libraries/Adafruit_HTU21DF/examples/HTU21DFtest/HTU21DFtest.ino

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+/***************************************************
+  This is an example 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
+ ****************************************************/
+
+#include <Wire.h>
+#include "Adafruit_HTU21DF.h"
+
+// Connect Vin to 3-5VDC
+// Connect GND to ground
+// Connect SCL to I2C clock pin (A5 on UNO)
+// Connect SDA to I2C data pin (A4 on UNO)
+
+Adafruit_HTU21DF htu = Adafruit_HTU21DF();
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("HTU21D-F test");
+
+  if (!htu.begin()) {
+    Serial.println("Couldn't find sensor!");
+    while (1);
+  }
+}
+
+void loop() {
+    float temp = htu.readTemperature();
+    float rel_hum = htu.readHumidity();
+    Serial.print("Temp: "); Serial.print(temp); Serial.print(" C");
+    Serial.print("\t\t");
+    Serial.print("Humidity: "); Serial.print(rel_hum); Serial.println(" \%");
+    delay(500);
+}

arduino-cli/libraries/Adafruit_HTU21DF/library.properties

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+name=Adafruit HTU21DF Library
+version=1.0.5
+author=Adafruit
+maintainer=Adafruit <info@adafruit.com>
+sentence=Arduino library for the HTU21D-F sensors in the Adafruit shop
+paragraph=Arduino library for the HTU21D-F sensors in the Adafruit shop
+category=Sensors
+url=https://github.com/adafruit/Adafruit_HTU21DF_Library
+architectures=*