aboutsummaryrefslogtreecommitdiff
path: root/libraries/Ethernet/examples/BarometricPressureWebServer
diff options
context:
space:
mode:
Diffstat (limited to 'libraries/Ethernet/examples/BarometricPressureWebServer')
-rw-r--r--libraries/Ethernet/examples/BarometricPressureWebServer/BarometricPressureWebServer.ino222
1 files changed, 222 insertions, 0 deletions
diff --git a/libraries/Ethernet/examples/BarometricPressureWebServer/BarometricPressureWebServer.ino b/libraries/Ethernet/examples/BarometricPressureWebServer/BarometricPressureWebServer.ino
new file mode 100644
index 0000000..bfbcb6d
--- /dev/null
+++ b/libraries/Ethernet/examples/BarometricPressureWebServer/BarometricPressureWebServer.ino
@@ -0,0 +1,222 @@
+/*
+ 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);
+IPAddress gateway(192,168,1,1);
+IPAddress subnet(255, 255, 255, 0);
+
+
+// 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);
+}