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Arduino-Development

/*
  SCP1000 Barometric Pressure Sensor Display
 Serves the output of a Barometric Pressure Sensor as a web page.
 Uses the SPI library. For details on the sensor, see:
 http://www.sparkfun.com/commerce/product_info.php?products_id=8161
 This sketch adapted from Nathan Seidle's SCP1000 example for PIC:
 http://www.sparkfun.com/datasheets/Sensors/SCP1000-Testing.zip
 TODO: this hardware is long obsolete.  This example program should
 be rewritten to use https://www.sparkfun.com/products/9721
 Circuit:
 SCP1000 sensor attached to pins 6,7, and 11 - 13:
 DRDY: pin 6
 CSB: pin 7
 MOSI: pin 11
 MISO: pin 12
 SCK: pin 13
 created 31 July 2010
 by Tom Igoe
 */

#include <Ethernet.h>
// the sensor communicates using SPI, so include the library:
#include <SPI.h>


// assign a MAC address for the Ethernet controller.
// fill in your address here:
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
// assign an IP address for the controller:
IPAddress ip(192, 168, 1, 20);


// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);


//Sensor's memory register addresses:
const int PRESSURE = 0x1F;      //3 most significant bits of pressure
const int PRESSURE_LSB = 0x20;  //16 least significant bits of pressure
const int TEMPERATURE = 0x21;   //16 bit temperature reading

// pins used for the connection with the sensor
// the others you need are controlled by the SPI library):
const int dataReadyPin = 6;
const int chipSelectPin = 7;

float temperature = 0.0;
long pressure = 0;
long lastReadingTime = 0;

void setup() {
  // You can use Ethernet.init(pin) to configure the CS pin
  //Ethernet.init(10);  // Most Arduino shields
  //Ethernet.init(5);   // MKR ETH shield
  //Ethernet.init(0);   // Teensy 2.0
  //Ethernet.init(20);  // Teensy++ 2.0
  //Ethernet.init(15);  // ESP8266 with Adafruit Featherwing Ethernet
  //Ethernet.init(33);  // ESP32 with Adafruit Featherwing Ethernet

  // start the SPI library:
  SPI.begin();

  // start the Ethernet connection
  Ethernet.begin(mac, ip);

  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  // Check for Ethernet hardware present
  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
    Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
    while (true) {
      delay(1); // do nothing, no point running without Ethernet hardware
    }
  }
  if (Ethernet.linkStatus() == LinkOFF) {
    Serial.println("Ethernet cable is not connected.");
  }

  // start listening for clients
  server.begin();

  // initalize the data ready and chip select pins:
  pinMode(dataReadyPin, INPUT);
  pinMode(chipSelectPin, OUTPUT);

  //Configure SCP1000 for low noise configuration:
  writeRegister(0x02, 0x2D);
  writeRegister(0x01, 0x03);
  writeRegister(0x03, 0x02);

  // give the sensor and Ethernet shield time to set up:
  delay(1000);

  //Set the sensor to high resolution mode tp start readings:
  writeRegister(0x03, 0x0A);

}

void loop() {
  // check for a reading no more than once a second.
  if (millis() - lastReadingTime > 1000) {
    // if there's a reading ready, read it:
    // don't do anything until the data ready pin is high:
    if (digitalRead(dataReadyPin) == HIGH) {
      getData();
      // timestamp the last time you got a reading:
      lastReadingTime = millis();
    }
  }

  // listen for incoming Ethernet connections:
  listenForEthernetClients();
}


void getData() {
  Serial.println("Getting reading");
  //Read the temperature data
  int tempData = readRegister(0x21, 2);

  // convert the temperature to celsius and display it:
  temperature = (float)tempData / 20.0;

  //Read the pressure data highest 3 bits:
  byte  pressureDataHigh = readRegister(0x1F, 1);
  pressureDataHigh &= 0b00000111; //you only needs bits 2 to 0

  //Read the pressure data lower 16 bits:
  unsigned int pressureDataLow = readRegister(0x20, 2);
  //combine the two parts into one 19-bit number:
  pressure = ((pressureDataHigh << 16) | pressureDataLow) / 4;

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" degrees C");
  Serial.print("Pressure: " + String(pressure));
  Serial.println(" Pa");
}

void listenForEthernetClients() {
  // listen for incoming clients
  EthernetClient client = server.available();
  if (client) {
    Serial.println("Got a client");
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          // print the current readings, in HTML format:
          client.print("Temperature: ");
          client.print(temperature);
          client.print(" degrees C");
          client.println("<br />");
          client.print("Pressure: " + String(pressure));
          client.print(" Pa");
          client.println("<br />");
          break;
        }
        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        } else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);
    // close the connection:
    client.stop();
  }
}


//Send a write command to SCP1000
void writeRegister(byte registerName, byte registerValue) {
  // SCP1000 expects the register name in the upper 6 bits
  // of the byte:
  registerName <<= 2;
  // command (read or write) goes in the lower two bits:
  registerName |= 0b00000010; //Write command

  // take the chip select low to select the device:
  digitalWrite(chipSelectPin, LOW);

  SPI.transfer(registerName); //Send register location
  SPI.transfer(registerValue); //Send value to record into register

  // take the chip select high to de-select:
  digitalWrite(chipSelectPin, HIGH);
}


//Read register from the SCP1000:
unsigned int readRegister(byte registerName, int numBytes) {
  byte inByte = 0;           // incoming from  the SPI read
  unsigned int result = 0;   // result to return

  // SCP1000 expects the register name in the upper 6 bits
  // of the byte:
  registerName <<=  2;
  // command (read or write) goes in the lower two bits:
  registerName &= 0b11111100; //Read command

  // take the chip select low to select the device:
  digitalWrite(chipSelectPin, LOW);
  // send the device the register you want to read:
  int command = SPI.transfer(registerName);
  // send a value of 0 to read the first byte returned:
  inByte = SPI.transfer(0x00);

  result = inByte;
  // if there's more than one byte returned,
  // shift the first byte then get the second byte:
  if (numBytes > 1) {
    result = inByte << 8;
    inByte = SPI.transfer(0x00);
    result = result | inByte;
  }
  // take the chip select high to de-select:
  digitalWrite(chipSelectPin, HIGH);
  // return the result:
  return (result);
}

	/*
	SCP1000 Barometric Pressure Sensor Display

	Serves the output of a Barometric Pressure Sensor as a web page.
	Uses the SPI library. For details on the sensor, see:
	http://www.sparkfun.com/commerce/product_info.php?products_id=8161

	This sketch adapted from Nathan Seidle's SCP1000 example for PIC:
	http://www.sparkfun.com/datasheets/Sensors/SCP1000-Testing.zip

	TODO: this hardware is long obsolete. This example program should
	be rewritten to use https://www.sparkfun.com/products/9721

	Circuit:
	SCP1000 sensor attached to pins 6,7, and 11 - 13:
	DRDY: pin 6
	CSB: pin 7
	MOSI: pin 11
	MISO: pin 12
	SCK: pin 13

	created 31 July 2010
	by Tom Igoe
	*/

	#include <Ethernet.h>
	// the sensor communicates using SPI, so include the library:
	#include <SPI.h>


	// assign a MAC address for the Ethernet controller.
	// fill in your address here:
	byte mac[] = {
	0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
	};
	// assign an IP address for the controller:
	IPAddress ip(192, 168, 1, 20);


	// Initialize the Ethernet server library
	// with the IP address and port you want to use
	// (port 80 is default for HTTP):
	EthernetServer server(80);


	//Sensor's memory register addresses:
	const int PRESSURE = 0x1F; //3 most significant bits of pressure
	const int PRESSURE_LSB = 0x20; //16 least significant bits of pressure
	const int TEMPERATURE = 0x21; //16 bit temperature reading

	// pins used for the connection with the sensor
	// the others you need are controlled by the SPI library):
	const int dataReadyPin = 6;
	const int chipSelectPin = 7;

	float temperature = 0.0;
	long pressure = 0;
	long lastReadingTime = 0;

	void setup() {
	// You can use Ethernet.init(pin) to configure the CS pin
	//Ethernet.init(10); // Most Arduino shields
	//Ethernet.init(5); // MKR ETH shield
	//Ethernet.init(0); // Teensy 2.0
	//Ethernet.init(20); // Teensy++ 2.0
	//Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet
	//Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet

	// start the SPI library:
	SPI.begin();

	// start the Ethernet connection
	Ethernet.begin(mac, ip);

	// Open serial communications and wait for port to open:
	Serial.begin(9600);
	while (!Serial) {
	; // wait for serial port to connect. Needed for native USB port only
	}

	// Check for Ethernet hardware present
	if (Ethernet.hardwareStatus() == EthernetNoHardware) {
	Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");
	while (true) {
	delay(1); // do nothing, no point running without Ethernet hardware
	}
	}
	if (Ethernet.linkStatus() == LinkOFF) {
	Serial.println("Ethernet cable is not connected.");
	}

	// start listening for clients
	server.begin();

	// initalize the data ready and chip select pins:
	pinMode(dataReadyPin, INPUT);
	pinMode(chipSelectPin, OUTPUT);

	//Configure SCP1000 for low noise configuration:
	writeRegister(0x02, 0x2D);
	writeRegister(0x01, 0x03);
	writeRegister(0x03, 0x02);

	// give the sensor and Ethernet shield time to set up:
	delay(1000);

	//Set the sensor to high resolution mode tp start readings:
	writeRegister(0x03, 0x0A);

	}

	void loop() {
	// check for a reading no more than once a second.
	if (millis() - lastReadingTime > 1000) {
	// if there's a reading ready, read it:
	// don't do anything until the data ready pin is high:
	if (digitalRead(dataReadyPin) == HIGH) {
	getData();
	// timestamp the last time you got a reading:
	lastReadingTime = millis();
	}
	}

	// listen for incoming Ethernet connections:
	listenForEthernetClients();
	}


	void getData() {
	Serial.println("Getting reading");
	//Read the temperature data
	int tempData = readRegister(0x21, 2);

	// convert the temperature to celsius and display it:
	temperature = (float)tempData / 20.0;

	//Read the pressure data highest 3 bits:
	byte pressureDataHigh = readRegister(0x1F, 1);
	pressureDataHigh &= 0b00000111; //you only needs bits 2 to 0

	//Read the pressure data lower 16 bits:
	unsigned int pressureDataLow = readRegister(0x20, 2);
	//combine the two parts into one 19-bit number:
	pressure = ((pressureDataHigh << 16) \| pressureDataLow) / 4;

	Serial.print("Temperature: ");
	Serial.print(temperature);
	Serial.println(" degrees C");
	Serial.print("Pressure: " + String(pressure));
	Serial.println(" Pa");
	}

	void listenForEthernetClients() {
	// listen for incoming clients
	EthernetClient client = server.available();
	if (client) {
	Serial.println("Got a client");
	// an http request ends with a blank line
	boolean currentLineIsBlank = true;
	while (client.connected()) {
	if (client.available()) {
	char c = client.read();
	// if you've gotten to the end of the line (received a newline
	// character) and the line is blank, the http request has ended,
	// so you can send a reply
	if (c == '\n' && currentLineIsBlank) {
	// send a standard http response header
	client.println("HTTP/1.1 200 OK");
	client.println("Content-Type: text/html");
	client.println();
	// print the current readings, in HTML format:
	client.print("Temperature: ");
	client.print(temperature);
	client.print(" degrees C");
	client.println("<br />");
	client.print("Pressure: " + String(pressure));
	client.print(" Pa");
	client.println("<br />");
	break;
	}
	if (c == '\n') {
	// you're starting a new line
	currentLineIsBlank = true;
	} else if (c != '\r') {
	// you've gotten a character on the current line
	currentLineIsBlank = false;
	}
	}
	}
	// give the web browser time to receive the data
	delay(1);
	// close the connection:
	client.stop();
	}
	}


	//Send a write command to SCP1000
	void writeRegister(byte registerName, byte registerValue) {
	// SCP1000 expects the register name in the upper 6 bits
	// of the byte:
	registerName <<= 2;
	// command (read or write) goes in the lower two bits:
	registerName \|= 0b00000010; //Write command

	// take the chip select low to select the device:
	digitalWrite(chipSelectPin, LOW);

	SPI.transfer(registerName); //Send register location
	SPI.transfer(registerValue); //Send value to record into register

	// take the chip select high to de-select:
	digitalWrite(chipSelectPin, HIGH);
	}


	//Read register from the SCP1000:
	unsigned int readRegister(byte registerName, int numBytes) {
	byte inByte = 0; // incoming from the SPI read
	unsigned int result = 0; // result to return

	// SCP1000 expects the register name in the upper 6 bits
	// of the byte:
	registerName <<= 2;
	// command (read or write) goes in the lower two bits:
	registerName &= 0b11111100; //Read command

	// take the chip select low to select the device:
	digitalWrite(chipSelectPin, LOW);
	// send the device the register you want to read:
	int command = SPI.transfer(registerName);
	// send a value of 0 to read the first byte returned:
	inByte = SPI.transfer(0x00);

	result = inByte;
	// if there's more than one byte returned,
	// shift the first byte then get the second byte:
	if (numBytes > 1) {
	result = inByte << 8;
	inByte = SPI.transfer(0x00);
	result = result \| inByte;
	}
	// take the chip select high to de-select:
	digitalWrite(chipSelectPin, HIGH);
	// return the result:
	return (result);
	}