Sending float data | Arduino | Forum

gadjet said

I used this: -
updateThingSpeak("field1="+ String(sensors.getTempC(Thermometer),DEC));

This takes the float value from my DS18B20 temp sensor.

If anyone is around I used a slightly different take to get decimal values to two decimal places.
I needed 3 values passed to thingspeak. Most of the code below is just debug stuff but I left it in.
The lines that do the work are the FLOAT.

Yes I borrowed the code from another thingspeak member and just tweaked it a little as it seemed slightly more modular and easier to add sensor routines see http://community.thingspeak.com/forum/arduino/ds18b20-temp-sensor/ Raklinks post

//Print Temperatures
Serial.print("Getting temperatures...

");
sensors.requestTemperatures();
float WT = sensors.getTempC(WaterTemp); // was int
Serial.print("INVALID: ");
Serial.print(WT);
Serial.print("C: ");
Serial.print("

");
float OT = sensors.getTempC(OutsideTemp); // was int
Serial.print("Room Temp is: ");
Serial.print(OT);
Serial.print("C: ");
Serial.print("

");
// read value of 5V solar panel 0 to 500
float LT = (analogRead(A0)); // was int
//String AP = String(analogRead(A0), DEC);
Serial.print("light: ");
Serial.print(LT/100); // divide by 100 to get voltage produced
Serial.print("V: ");
Serial.print("

");

// Update ThingSpeak
if(!client.connected() && (millis() - lastConnectionTime > updateThingSpeakInterval))
{
updateThingSpeak("field1="+String(WT, DEC) +"&field2="+String(OT, DEC)+"&field3="+String(LT, DEC));