/*
 * =====================================================================================
 *
 *       Filename:  SFM3400Test.ino
 *
 *    Description:  Senserion SFM3X00 library
 *
 *        Version:  1.0
 *        Created:  04/16/2020 16:59:40
 *
 *   Organization:  Public Invention
 *
 *        License:  Senserion BSD 3-Clause License
 *
 * =====================================================================================
 */
#include <Arduino.h>
#include <SFM3X00.h>
#include <I2C_Slave.h>

// delay between readings
#define SAMPLE_DELAY   100

// address of sensor
// usually 64 or 0x40 by default
#define FLOW_SENSOR_ADDRESS 0x40

// create insance of sensor with address 
SFM3X00 flowSensor(FLOW_SENSOR_ADDRESS);

// callback to handle I2C commands upon receipt
void command_handler(uint16_t command, uint16_t value) {
    Slave.writeRegisters(value);
}

void setup()
{
  // establish serial communication
  Slave.begin(FLOW_SENSOR_ADDRESS);
  Slave.onCommand(command_handler);
  Serial.begin(9600);

  // initialize sensor values and start measuring flow
  flowSensor.begin();
  delay(1000);

  // print various sensor values
  Serial.println();
  Serial.print("sensor serial number: ");
  Serial.println(flowSensor.serialNumber, HEX);
  Serial.print("sensor article number: ");
  Serial.println(flowSensor.articleNumber, HEX);
  Serial.println();
  Serial.print("read scale factor: ");
  Serial.println(flowSensor.flowScale);
  Serial.print("read flow offset: ");
  Serial.println(flowSensor.flowOffset);
  
  // display the sample rate in hertz
  Serial.print("sample rate: ");
  Serial.print(1000.0 / (float)SAMPLE_DELAY);
  Serial.println(" Hz");
  Serial.println();

  flowSensor.begin();
  delay(5);
}


void loop()
{

  // read flow from sensor and print
  float flow = flowSensor.readFlow();

  if(flowSensor.checkRange(flow))
  {
    Serial.print("flow exceeded sensor limits:  ");
    Serial.print(flow);
    Serial.println(" slm");
  }
  else
  {
    Serial.print("flow : ");
    Serial.print(flow);
    Serial.println(" slm");
  }

  delay(SAMPLE_DELAY);
}