Hi,
I have this temperature sensor ( http://www.ebay.com/itm/361139777153?_trksid=p2060353.m2749.l2649 ).
How can I use it to measure temperatures by Arduino? I know it increases resistance because of heat (it has about 30ohms in room temperature, goes up to +- 60 ohms when I hold lighter under it).
Bud how to use it with Arduino? As far as I know, I first need to get resistance values for which I know the temperature, and then I will be able to calculate the temperature from resistance.
But I think it's the resistance change isn't linear to temperature change, so how to create the formula to calculate temperature from resistance? And is it even possible to use Arduino for this? The temperature sensor was used in some PID temperature controller, but the PID has gone away.
Hi,
You have a thermocouple, not a resistance type sensor.
See This Page for how-to use this type of sensor.
You will need a thermocouple amplifier like the small module in this photo:
To use a K type thermocouple with the Arduino you need an amplifier (p.e. Thermocouple Amplifier MAX31855 breakout board (MAX6675 upgrade) : ID 269 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits). These have a digitial output so the complexity of getting the temperature is wrapped and you don't have to do the calculation.
terryking228:
Hi,
You have a thermocouple, not a resistance type sensor.See This Page for how-to use this type of sensor.
You will need a thermocouple amplifier like the small module in this photo:
Damm. I wanted to get it working todays.
I ordered the MAX6675 module, but is there any way to get it working without it?
but is there any way to get it working without it?
You can use a good digital multimeter to read the tiny voltages, and look up the temperature in the K-type thermocouple tables.
The table temperature will be off by tens of degrees, because you don't have a cold junction reference.