IP Configuration

lib/Adafruit_Si7021/Adafruit_Si7021.cpp

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+/**************************************************************************/
+/*!
+    @file     Adafruit_Si7021.cpp
+    @author   Limor Fried (Adafruit Industries)
+    @license  BSD (see license.txt)
+
+    This is a library for the Adafruit Si7021 breakout board
+    ----> https://www.adafruit.com/products/3251
+
+    Adafruit invests time and resources providing this open source code,
+    please support Adafruit and open-source hardware by purchasing
+    products from Adafruit!
+
+    @section  HISTORY
+
+    v1.0  - First release
+*/
+/**************************************************************************/
+
+#if ARDUINO >= 100
+ #include "Arduino.h"
+#else
+ #include "WProgram.h"
+#endif
+
+#include <Wire.h>
+#include <Adafruit_Si7021.h>
+
+
+/**************************************************************************/
+
+Adafruit_Si7021::Adafruit_Si7021(void) {
+  _i2caddr = SI7021_DEFAULT_ADDRESS;
+  sernum_a = sernum_b = 0;
+}
+
+bool Adafruit_Si7021::begin(void) {
+  Wire.begin();
+
+  reset();
+  if (readRegister8(SI7021_READRHT_REG_CMD) != 0x3A) return false;
+
+  readSerialNumber();
+
+  //Serial.println(sernum_a, HEX);
+  //Serial.println(sernum_b, HEX);
+
+  return true;
+}
+
+float Adafruit_Si7021::readHumidity(void) {
+  Wire.beginTransmission(_i2caddr);
+  Wire.write((uint8_t)SI7021_MEASRH_NOHOLD_CMD);
+  Wire.endTransmission(false);
+  delay(25);
+
+  Wire.requestFrom(_i2caddr, 3);
+  uint16_t hum = Wire.read();
+  hum <<= 8;
+  hum |= Wire.read();
+  uint8_t chxsum = Wire.read();
+
+  float humidity = hum;
+  humidity *= 125;
+  humidity /= 65536;
+  humidity -= 6;
+
+  return humidity;
+}
+
+float Adafruit_Si7021::readTemperature(void) {
+  Wire.beginTransmission(_i2caddr);
+  Wire.write((uint8_t)SI7021_MEASTEMP_NOHOLD_CMD);
+  Wire.endTransmission(false);
+  delay(25);
+
+  Wire.requestFrom(_i2caddr, 3);
+  uint16_t temp = Wire.read();
+  temp <<= 8;
+  temp |= Wire.read();
+  uint8_t chxsum = Wire.read();
+
+  float temperature = temp;
+  temperature *= 175.72;
+  temperature /= 65536;
+  temperature -= 46.85;
+
+  return temperature;
+}
+
+void Adafruit_Si7021::reset(void) {
+  Wire.beginTransmission(_i2caddr);
+  Wire.write((uint8_t)SI7021_RESET_CMD);
+  Wire.endTransmission();
+  delay(50);
+}
+
+void Adafruit_Si7021::readSerialNumber(void) {
+  Wire.beginTransmission(_i2caddr);
+  Wire.write((uint8_t)(SI7021_ID1_CMD>>8));
+  Wire.write((uint8_t)(SI7021_ID1_CMD&0xFF));
+  Wire.endTransmission();
+
+  Wire.requestFrom(_i2caddr, 8);
+  sernum_a = Wire.read();
+  Wire.read();
+  sernum_a <<= 8;
+  sernum_a |= Wire.read();
+  Wire.read();
+  sernum_a <<= 8;
+  sernum_a |= Wire.read();
+  Wire.read();
+  sernum_a <<= 8;
+  sernum_a |= Wire.read();
+  Wire.read();
+
+  Wire.beginTransmission(_i2caddr);
+  Wire.write((uint8_t)(SI7021_ID2_CMD>>8));
+  Wire.write((uint8_t)(SI7021_ID2_CMD&0xFF));
+  Wire.endTransmission();
+
+  Wire.requestFrom(_i2caddr, 8);
+  sernum_b = Wire.read();
+  Wire.read();
+  sernum_b <<= 8;
+  sernum_b |= Wire.read();
+  Wire.read();
+  sernum_b <<= 8;
+  sernum_b |= Wire.read();
+  Wire.read();
+  sernum_b <<= 8;
+  sernum_b |= Wire.read();
+  Wire.read();
+}
+
+/*******************************************************************/
+
+void Adafruit_Si7021::writeRegister8(uint8_t reg, uint8_t value) {
+  Wire.beginTransmission(_i2caddr);
+  Wire.write((uint8_t)reg);
+  Wire.write((uint8_t)value);
+  Wire.endTransmission();
+
+  //Serial.print("Wrote $"); Serial.print(reg, HEX); Serial.print(": 0x"); Serial.println(value, HEX);
+}
+
+uint8_t Adafruit_Si7021::readRegister8(uint8_t reg) {
+  uint8_t value;
+  Wire.beginTransmission(_i2caddr);
+  Wire.write((uint8_t)reg);
+  Wire.endTransmission(false);
+
+  Wire.requestFrom(_i2caddr, 1);
+  value = Wire.read();
+
+  //Serial.print("Read $"); Serial.print(reg, HEX); Serial.print(": 0x"); Serial.println(value, HEX);
+  return value;
+}
+
+uint16_t Adafruit_Si7021::readRegister16(uint8_t reg) {
+  uint16_t value;
+  Wire.beginTransmission(_i2caddr);
+  Wire.write((uint8_t)reg);
+  Wire.endTransmission();
+
+  Wire.requestFrom(_i2caddr, 2);
+  value = Wire.read();
+  value <<= 8;
+  value |= Wire.read();
+
+  //Serial.print("Read $"); Serial.print(reg, HEX); Serial.print(": 0x"); Serial.println(value, HEX);
+  return value;
+}

lib/Adafruit_Si7021/Adafruit_Si7021.h

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+/**************************************************************************/
+/*!
+    @file     Adafruit_Si7021.h
+    @author   Limor Fried (Adafruit Industries)
+    @license  BSD (see license.txt)
+
+    This is a library for the Adafruit Si7021 breakout board
+    ----> https://www.adafruit.com/products/3251
+
+    Adafruit invests time and resources providing this open source code,
+    please support Adafruit and open-source hardware by purchasing
+    products from Adafruit!
+
+    @section  HISTORY
+
+    v1.0  - First release
+*/
+/**************************************************************************/
+
+#ifndef __Si7021_H__
+#define __Si7021_H__
+
+#if ARDUINO >= 100
+ #include "Arduino.h"
+#else
+ #include "WProgram.h"
+#endif
+
+/*=========================================================================
+    I2C ADDRESS/BITS
+    -----------------------------------------------------------------------*/
+#define SI7021_DEFAULT_ADDRESS         (0x40)
+
+#define SI7021_MEASRH_HOLD_CMD           0xE5
+#define SI7021_MEASRH_NOHOLD_CMD         0xF5
+#define SI7021_MEASTEMP_HOLD_CMD         0xE3
+#define SI7021_MEASTEMP_NOHOLD_CMD       0xF3
+#define SI7021_READPREVTEMP_CMD          0xE0
+#define SI7021_RESET_CMD                 0xFE
+#define SI7021_WRITERHT_REG_CMD          0xE6
+#define SI7021_READRHT_REG_CMD           0xE7
+#define SI7021_WRITEHEATER_REG_CMD       0x51
+#define SI7021_READHEATER_REG_CMD        0x11
+#define SI7021_ID1_CMD                   0xFA0F
+#define SI7021_ID2_CMD                   0xFCC9
+#define SI7021_FIRMVERS_CMD              0x84B8
+
+
+/*=========================================================================*/
+
+class Adafruit_Si7021 {
+ public:
+  Adafruit_Si7021(void);
+  bool begin(void);
+
+  float readTemperature(void);
+  void reset(void);
+  void readSerialNumber(void);
+  float readHumidity(void);
+
+  uint32_t sernum_a, sernum_b;
+
+ private:
+
+  uint8_t readRegister8(uint8_t reg);
+  uint16_t readRegister16(uint8_t reg);
+  void writeRegister8(uint8_t reg, uint8_t value);
+
+  int8_t  _i2caddr;
+};
+
+/**************************************************************************/
+
+#endif // __Si7021_H__

lib/Adafruit_Si7021/README.md

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+Adafruit Si7021
+===============
+
+Driver for Adafruit's Si7021 humidity / temp sensor breakout
+
+Designed specifically to work with the Si7021 breakout in the adafruit shop
+
+   * https://www.adafruit.com/products/3251
+
+This chip uses 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!
+
+Check out the links above for our tutorials and wiring diagrams 
+
+Written by Limor Fried/Ladyada for Adafruit Industries.  
+BSD license, all text above must be included in any redistribution
+
+To download. click the ZIP button on the right, rename the uncompressed folder Adafruit_Si7021. Check that the Adafruit_Si7021 folder contains Adafruit_Si7021.cpp and Adafruit_Si7021.h
+
+Place the Adafruit_Si7021 library folder your arduinosketchfolder/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.

lib/Adafruit_Si7021/examples/si7021.ino

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+#include "Adafruit_Si7021.h"
+
+Adafruit_Si7021 sensor = Adafruit_Si7021();
+
+void setup() {
+  Serial.begin(115200);
+
+  // wait for serial port to open
+  while (!Serial) {
+    delay(10);
+  }
+
+  Serial.println("Si7021 test!");
+  
+  if (!sensor.begin()) {
+    Serial.println("Did not find Si7021 sensor!");
+    while (true);
+  }
+}
+
+void loop() {
+  Serial.print("Humidity:    "); Serial.print(sensor.readHumidity(), 2);
+  Serial.print("\tTemperature: "); Serial.println(sensor.readTemperature(), 2);
+  delay(1000);
+}

lib/Adafruit_Si7021/library.properties

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+name=Adafruit Si7021 Library
+version=1.0.1
+author=Adafruit
+maintainer=Adafruit <info@adafruit.com>
+sentence=Arduino library for Si7021 sensors.
+paragraph=Arduino library for Si7021 temperature + humidity sensors.
+category=Sensors
+url=https://github.com/adafruit/Adafruit_Si7021
+architectures=*