Arduino + WizNet Ethernet Shield + Xively

I got this WizNet Ethernet Shield that i wanted to try out with the Arduino since the CC3000s proved to be a complete disaster. The shield appeared to be of chinese make and quiet different from the original Arduino Ethernet shield. I stacked my Sparkfun Weather shield on top of it as shown below only to find out that there was no provision to connect the I2C lines from the Arduino. SDA and SCL were not brought out onto the ethernet shield. Even the IOREF pin was not connected which was not helping the weather shield as the temperature and humidity sensor were interfaced using I2C and also needed the reference voltage. Looks like i have to tryout the original arduino ethernet shield sometime which has the I2C header present.Anyways i can only acquire the light sensor data using sparkfun shield using the existing setup.

 The code for the same is as below and what i had shown in an earlier post. The temperature and humidity settings have been zeroed out. The data is sent out to the Xively website.

	#include <SPI.h>
	#include <Ethernet.h>
	#include <Wire.h> // I2C needed for sensors
	#include "MPL3115A2.h" // Pressure sensor
	#include "HTU21D.h" // Humidity sensor
	// Enter a MAC address and IP address for your controller below.
	// The IP address will be dependent on your local network:
	byte mac[] = { "Your MAC" };
	IPAddress server(216,52,233,120);
	IPAddress ip( "Your IP" );
	EthernetClient client;
	MPL3115A2 myPressure; //Create an instance of the pressure sensor
	HTU21D myHumidity; //Create an instance of the humidity sensor
	const byte STAT1 = 7;
	const byte STAT2 = 8;
	const byte LIGHT = A1;
	const byte REFERENCE_3V3 = A3;
	float humidity = 0; // [%]
	float tempf = 0; // [temperature F]
	float pressure = 0;
	float light_lvl = 455; //[analog value from 0 to 1023]
	#define WEBSITE "api.xively.com"
	#define API_key "Your APIKey"
	#define feedID "Your FeedID"
	//Returns the voltage of the light sensor based on the 3.3V rail
	//This allows us to ignore what VCC might be (an Arduino plugged into USB has VCC of 4.5 to 5.2V)
	float get_light_level()
	{
	float operatingVoltage = analogRead(REFERENCE_3V3);
	float lightSensor = analogRead(LIGHT);
	operatingVoltage = 3.3 / operatingVoltage; //The reference voltage is 3.3V
	lightSensor = operatingVoltage * lightSensor;
	return(lightSensor);
	}
	//Calculates each of the variables that wunderground is expecting
	void calcWeather()
	{
	//Calc humidity
	humidity = myHumidity.readHumidity();
	//float temp_h = myHumidity.readTemperature();
	//Serial.print(" TempH:");
	//Serial.print(temp_h, 2);
	//Calc tempf from pressure sensor
	tempf = myPressure.readTempF();
	tempf = (tempf - 32.0)/1.8000;
	//Serial.print(" TempP:");
	//Serial.print(tempf, 2);
	tempf = 0;
	humidity = 0;
	//Calc pressure
	//pressure = (myPressure.readPressure())/100000;
	//Calc light level
	light_lvl = get_light_level() * 100;
	}
	void setup() {
	// Open serial communications and wait for port to open:
	Serial.begin(9600);
	while (!Serial) {
	; // wait for serial port to connect. Needed for Leonardo only
	}
	// start the Ethernet connection:
	if (Ethernet.begin(mac) == 0) {
	Serial.println("Failed to configure Ethernet using DHCP");
	// DHCP failed, so use a fixed IP address:
	Ethernet.begin(mac, ip);
	}
	}
	void loop() {
	calcWeather();
	digitalWrite(STAT1, HIGH); //Blink stat LED
	// Prepare JSON for Xively & get length
	int length = 0;
	String data = "";
	data = data + "\n" + "{\"version\":\"1.0.0\",\"datastreams\" : [ {\"id\" : \"Humidity\",\"current_value\" : \"" + String(humidity) + "\"},"
	+ "{\"id\" : \"Luminosity\",\"current_value\" : \"" + String(light_lvl) + "\"}]}";
	length = data.length();
	digitalWrite(STAT1, HIGH); //Blink stat LED
	if (client.connect(server, 80)) {
	Serial.println("Client Connected");
	if (client.connected())
	{
	Serial.println("Connected!");
	client.println("PUT /v2/feeds/" + String(feedID) + ".json HTTP/1.0");
	client.println("Host: api.xively.com");
	client.println("X-ApiKey: " + String(API_key));
	client.println("Content-Length: " + String(length));
	client.print("Connection: close");
	client.println();
	client.print(data);
	client.println();
	digitalWrite(STAT1, LOW); //Blink stat LED
	digitalWrite(STAT2, LOW); //Blink stat LED
	}
	else {
	Serial.println(F("Connection failed"));
	client.stop();
	return;
	}
	while (client.connected()) {
	while (client.available()) {
	char c = client.read();
	// Serial.print(c);
	}
	client.stop();
	}
	delay(1000);
	}
	else {
	Serial.println("Client Failure");
	}
	}

view raw WizNETIoT.ino hosted with ❤ by GitHub

Alternatively to test how effective the ethernet shield was i sent a value of 0 and 50 alternatively every 2 seconds to the Xively website. The code for that is shown below. Also shown below is the screenshot from the Xively site displaying the incoming data in the graph. Ideally the graph is supposed to be a continuous " saw waveform". The gaps that you can see are the connection to the xively site failing. It takes some amount of time to get back online. But it does recover unlike the CC3000 that goes into some infinite loop. So, apart from the fact that the I2C is messed up, i kinda like this shield. I hope the guys who made this shield add those I2C headers.... :)

	#include <SPI.h>
	#include <Ethernet.h>
	// Enter a MAC address and IP address for your controller below.
	// The IP address will be dependent on your local network:
	byte mac[] = { "Your MAC" };
	IPAddress server(216,52,233,120);
	IPAddress ip( "Your IP" );
	unsigned int randomdata = 0;
	EthernetClient client;
	#define WEBSITE "api.xively.com"
	#define API_key "Your APIKey"
	#define feedID "Your FeedID"
	void setup() {
	// Open serial communications and wait for port to open:
	Serial.begin(9600);
	while (!Serial) {
	; // wait for serial port to connect. Needed for Leonardo only
	}
	// start the Ethernet connection:
	if (Ethernet.begin(mac) == 0) {
	Serial.println("Failed to configure Ethernet using DHCP");
	// DHCP failed, so use a fixed IP address:
	Ethernet.begin(mac, ip);
	}
	}
	void Randomize()
	{
	randomdata = (randomdata == 0) ? 50 : 0;
	}
	void loop() {
	Randomize();
	// Prepare JSON for Xively & get length
	int length = 0;
	String data = "";
	data = data + "\n" + "{\"version\":\"1.0.0\",\"datastreams\" : [ {\"id\" : \"WaveForm\",\"current_value\" : \"" + String(randomdata) + "\"}]}";
	length = data.length();
	if (client.connect(server, 80)) {
	Serial.println("Client Connected");
	if (client.connected())
	{
	Serial.println("Connected!");
	client.println("PUT /v2/feeds/" + String(feedID) + ".json HTTP/1.0");
	client.println("Host: api.xively.com");
	client.println("X-ApiKey: " + String(API_key));
	client.println("Content-Length: " + String(length));
	client.print("Connection: close");
	client.println();
	client.print(data);
	client.println();
	digitalWrite(STAT1, LOW); //Blink stat LED
	}
	else {
	Serial.println(F("Connection failed"));
	client.stop();
	return;
	}
	while (client.connected()) {
	while (client.available()) {
	char c = client.read();
	// Serial.print(c);
	}
	client.stop();
	}
	delay(1000);
	}
	else {
	Serial.println("Client Failure");
	}
	}

view raw wave.ino hosted with ❤ by GitHub