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Read temperature from a TMP102 sensor and push to Xively
//
// Read temperature from a TMP102 sensor and push to Xively
//
#include <SPI.h>
#include <WiFly.h>
#include <Wire.h>
const char ssid[] = "BigBabyBoy";
const char wpaPassword[] = "mrjonesandme";
const char apiUsername[] = "ghing";
const char apiKey[] = "S9UpmnQPtEuPbXxtVKHzQFRYLyfEmUJ9Us8q8I3GqDFD3Ypx";
const char feedId[] = "960752696";
const int tmp102Address = 0x48;
WiFlyClient client("api.xively.com", 80);
void putXivelyData(const char *feedId, const char *apiKey, float temp) {
String feedPath = "/v2/feeds/" + String(feedId) + ".json";
char tempBuf[14];
String tempS;
String json;
dtostrf(temp, 7, 2, tempBuf);
tempS = String(tempBuf);
tempS.trim();
json = "{\"datastreams\":[{\"id\":\"temperature\", \"current_value\":\"" + tempS + "\"}]}";
Serial.println("connecting...");
if (!client.connect()) {
Serial.println("connection failed");
return;
}
Serial.println("connected");
client.print("PUT ");
client.print(feedPath);
client.print(" HTTP/1.1\n");
client.println("Host: api.xively.com");
client.print("X-ApiKey: ");
client.println(apiKey);
client.print("Content-Type: application/json\n");
client.print("Content-Length: ");
client.print(json.length());
client.print("\n\n");
client.println(json);
// Wait for response
delay(2000);
while (client.available()) {
Serial.print(client.readChar());
}
Serial.println();
if (client.connected()) {
Serial.println("disconnecting.");
client.stop();
}
}
// From http://bildr.org/2011/01/tmp102-arduino/
float getTemperature(){
Wire.requestFrom(tmp102Address, 2);
byte MSB = Wire.read();
byte LSB = Wire.read();
// it's a 12bit int, using two's compliment for negative
int TemperatureSum = ((MSB << 8) | LSB) >> 4;
float celsius = TemperatureSum*0.0625;
return celsius;
}
void setup() {
Serial.begin(9600);
WiFly.begin();
Wire.begin();
if (!WiFly.join(ssid, wpaPassword)) {
Serial.print("Failed to connect to the wifi network ");
Serial.println(ssid);
while (1) {
// Hang on failure
}
}
Serial.print("Wifi connection to ");
Serial.print(ssid);
Serial.println(" successful");
}
void loop() {
float celsius = getTemperature();
Serial.print("Celsius: ");
Serial.println(celsius);
float fahrenheit = (1.8 * celsius) + 32;
Serial.print("Fahrenheit: ");
Serial.println(fahrenheit);
putXivelyData(feedId, apiKey, fahrenheit);
delay(5000);
}
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