Step 1: What You Need?
1 x Arduino Board ( Arduino UNO used in this tutorial)
1 x Arduino Ethernet Shield
1 x SCP1000 Pressure Sensor Breakout Board
1 x Arduino Ethernet Shield
1 x SCP1000 Pressure Sensor Breakout Board
Optional
BMP180 I2C Digital Barometric Pressure Sensor Module
Don't have components? Don't worry. Just click the component's name.
Step 2: Build Your Circuit.
After wiring your sensor, your shield should be connected to a network with an ethernet cable. You will need to change the network settings in the program to correspond to your network.
In the above image, the Arduino or Genuino board would be stacked below the Ethernet shield.
Step 3: Upload The Code.
1. Select the Arduino board type: Select Tools >> Board >> Select your correct Arduino board used.
2. Find the port number by accessing device manager on Windows. See the section Port (COM&LPT) and look for an open port named "Arduino Uno (COMxx)". If you are using a different board, you will find a name accordingly. What matters is the xx in COMxx part. In my case, it's COM3. So my port number is 3.
Select the right port: Tools >> Port >> Select the port number.
3. You can find this code in the example of Arduino IDE.
Select File >> Examples >> Ethernet >> BarometricPressureWebServer
Click press the "upload" button (see the button with right arrow mark).
/*
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
http://www.vti.fi/en/support/obsolete_products/pressure_sensors/ This sketch adapted from Nathan Seidle's SCP1000 example for PIC:
http://www.sparkfun.com/datasheets/Sensors/SCP1000-Testing.zip 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() {
// start the SPI library:
SPI.begin(); // start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin(); // initalize the data ready and chip select pins:
pinMode(dataReadyPin, INPUT);
pinMode(chipSelectPin, OUTPUT); Serial.begin(9600); //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);
}
Download:
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