Electric Imp Agent Code for Si7020 Breakout Board w/ upload to data.sparkfun.com

Si7020_agent_push2sparkfun

// Create a data stream at data.sparkfun.com, then enter your keys here:
local publicKey = "8dX9xNk1w3sOv044oz1m"  // These are fake codes, please enter yours
local privateKey = "pzbnrbq6XvCzWn556pDE" // These are fake codes, please enter yours

function sample(params) {
  // Extract bits from the data sent by the agent
  // Combine the 2 bytes of data from Si7020 into a single uint16
  // then convert to float.  Do this for both temp and humidity
  local rh_code = (params[0]*256+params[1]).tofloat();
  local temp_code = (params[2]*256+params[3]).tofloat();
  
  // Use the formula on page 23 of the Si7020 Datasheet to convert the temp_code
  // to temperature in degrees C
  local temp_c = 175.72*temp_code/65536-46.85;
  
  // For those of us yanks, convert to fahrenheit
  local temp_f = temp_c*9/5+32;
  
  // Use the formula on page 22 of the Si7020 Datasheet to convert the rh_code
  // to humidity in %
  local humidity = 125*rh_code/65536-6;
  
  // Prepare the phant headers
  local phantHeaders = {"Phant-Private-Key": privateKey, "connection": "close"};
  
  // Create a post request
  local req = http.post("https://data.sparkfun.com/input/"+publicKey, phantHeaders,"humidity="+humidity+"&temp="+temp_f);
  
  //Send out the request!
  req.sendsync();
}

device.on("sample",sample);