Add SDP8xx example

Author: Fototux

SDP8xx_I2C_minimal_example/SDP8xx_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>
+
+// SDP810 500 Pa
+const int16_t SDP810_ADDRESS = 0x25;
+
+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("DP\tT");
+  
+  // init I2C
+  Wire.begin();
+  
+  // wait until sensors startup, > 25 ms according to datasheet
+  delay(25);
+
+  // start up sensor, sensor will go to continuous measurement mode
+  // differential pressure mode with averaging till read 
+  Wire.beginTransmission(SDP810_ADDRESS);
+  Wire.write(0x36);
+  Wire.write(0x15);
+  Wire.endTransmission();
+
+  // wait until first data is ready, > 8 ms
+  delay(10);
+}
+
+void loop() {
+
+  uint16_t scaling;
+  int16_t dp, temperature;
+  uint8_t data[9], counter;
+
+  // read measurement data, after two bytes a CRC follows
+  Wire.requestFrom(SDP810_ADDRESS, 9);
+  counter = 0;
+  while (Wire.available()) {
+    data[counter++] = Wire.read();
+  }
+
+  dp = (uint16_t)data[0] << 8 | data[1];
+  temperature = (uint16_t)data[3] << 8 | data[4];
+  scaling = (uint16_t)data[6] << 8 | data[7];
+
+
+  Serial.print(String(float(dp) / scaling));
+  Serial.print("\t");
+  Serial.print(String(float(temperature) / 200));
+  Serial.println();
+
+  // wait 100 ms for next measurement
+  delay(100);
+}