Add SFA30 example

Author: Fototux

SFA30_I2C_minimal_example/SFA30_I2C_minimal_example.ino

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+/*
+ * Copyright (c) 2020, Sensirion AG
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * * Neither the name of Sensirion AG nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Wire.h>
+
+// SFA30
+const int16_t SFA_ADDRESS = 0x5D;
+
+void setup() {
+  Serial.begin(115200);
+  // wait for serial connection from PC
+  // comment the following line if you'd like the output
+  // without waiting for the interface being ready
+  while(!Serial);
+
+  // init I2C
+  Wire.begin();
+
+  // wait until sensor is ready
+  delay(10);
+  
+  // start SFA measurement in periodic mode, will update every 0.5 s
+  Wire.beginTransmission(SFA_ADDRESS);
+  Wire.write(0x00);
+  Wire.write(0x06);
+  Wire.endTransmission();
+
+  // module is not outputing HCHO for the first 10 s after powering up
+  delay(10000);
+
+}
+
+void loop() {
+  float hcho, temperature, humidity;
+  uint8_t data[9], counter;
+
+  // send read data command
+  Wire.beginTransmission(SFA_ADDRESS);
+  Wire.write(0x03);
+  Wire.write(0x27);
+  Wire.endTransmission();
+
+  //wait time before reading for the values should be more than 2ms
+  delay(10);
+  
+  // read measurement data: 
+  // 2 bytes formaldehyde, 1 byte CRC, scale factor 5
+  // 2 bytes RH, 1 byte CRC, scale factor 100
+  // 2 bytes T, 1 byte CRC, scale factor 200
+  // stop reading after 9 bytes (not used)
+  Wire.requestFrom(SFA_ADDRESS, 9);
+  counter = 0;
+  while (Wire.available()) {
+    data[counter++] = Wire.read();
+  }
+  
+  // floating point conversion according to datasheet
+  hcho = (float)((int16_t)data[0] << 8 | data[1])/5;
+  // convert RH in %
+  humidity = (float)((int16_t)data[3] << 8 | data[4])/100;
+  // convert T in degC
+  temperature = (float)((int16_t)data[6] << 8 | data[7])/200;
+
+  Serial.print(hcho);
+  Serial.print("\t");
+  Serial.print(temperature);
+  Serial.print("\t");
+  Serial.print(humidity);
+  Serial.println();
+
+  // wait 1 s for next measurement read out, sensor is averaging in between
+  delay(1000);
+
+
+}