Add SVM40 example

Author: Fototux

SVM40_I2C_minimal_example/SVM40_I2C_minimal_example.ino

@@ -0,0 +1,102 @@
+/*
+* 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>
+ 
+// SVM40
+const int16_t SVM40_ADDRESS = 0x6A;
+ 
+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);
+ 
+  // output format
+  Serial.println("VOC_Index\tRH\tT");
+ 
+  // init I2C
+  Wire.begin();
+ 
+  // wait until sensors startup, > 1 ms according to datasheet
+  delay(1);
+ 
+  // start up sensor, sensor will go to continous measurement mode
+  // each second there will be new measurement values
+  Wire.beginTransmission(SVM40_ADDRESS);
+  Wire.write(0x00);
+  Wire.write(0x10);
+  Wire.endTransmission();
+ 
+  // wait until sensors is ready, fan is initialized
+  delay(1000);
+}
+ 
+void loop() {
+ 
+  int16_t voc, humidity, temperature;
+  uint8_t data[9], counter;
+ 
+  // read measurement data
+  Wire.beginTransmission(SVM40_ADDRESS);
+  Wire.write(0x03);
+  Wire.write(0xA6);
+  Wire.endTransmission();
+ 
+  // wait 5 ms to allow the sensor to fill the internal buffer
+  delay(5);
+ 
+  // read measurement data svm40, after two bytes a CRC follows
+  Wire.requestFrom(SVM40_ADDRESS, 9);
+  counter = 0;
+  while (Wire.available()) {
+    data[counter++] = Wire.read();
+  }
+ 
+  // VOC level is a signed int and scaled by a factor of 10 and needs to be divided by 10
+  // humidity is a signed int and scaled by 100 and need to be divided by 100
+  // temperature is a signed int and scaled by 200 and need to be divided by 200
+  voc = (uint16_t)data[0] << 8 | data[1];
+  humidity = (uint16_t)data[3] << 8 | data[4];
+  temperature = (uint16_t)data[6] << 8 | data[7];
+ 
+  Serial.print(String(float(voc) / 10));
+  Serial.print("\t");
+  Serial.print(String(float(humidity) / 100));
+  Serial.print("\t");
+  Serial.print(String(float(temperature) / 200));
+  Serial.println();
+ 
+  // wait 1 s for next measurement
+  delay(1000);
+}