I'm pretty new to electronics so please excuse my ignorance!
I'm attempting to make a very basic application from an Arduino - I'm attempting to sense the outside and inside temperature of my house.
I've bought some LM35s and they work well when directly attached to a multimeter, or plugged into a breadboard very close to the Arduino. However when I tried to put one in a box outside the house it didn't work as I expected. I used some long (approximately 4 meters) multi-strand cabling a bit like this:
The output voltage of the LM35 (measured at the end of the cable) was fluctuating either side of the correct value and off by a significant amount.
Since the output voltage of the LM35 is in the millivolts range (0mV at 0, +10mV per degree above that, so 250mV at 25 deg C) does that mean that the resistance of the cabling is having an effect?
I measured the resistance of each strand of the cable and they all came out at around 1.0 Ohms.