I'm looking for some input as to whether I'm dumb or my sensor's busted.
I created an instance using my Fusion Brain and just a temperature sensor. I finally got the configurator file working using just the Temperature sensor[celcius] function. When I read the value running the config file in MDX, I got temps around 40 C.
I implanted the C->F converter parameters into the function and got temps around 120 F, also.
Could I be using the standard functions wrong or do I have a busted sensor? (granted it is kinda old...)
How old? If you ordered in early to mid 2007, you have a different temperature sensor, which will read high if used with the newer sensor's function. By any chance can you read the markings on the black part?
Originally Posted by ctsoccer13
Ah, yea.. I did order it probably mid-last year.
The ridiculously small writing on the back says something along the lines of:
Forgive me if I'm off by a letter or number--it's kinda hard to read :)
if you can, probe the sensor with a multimeter while it's being powered. Let us knwo what voltage it reports, and what temperature.
hey, sorry it took me a while to respond--had a bit going on.
I measured the voltage across it and its at 3.618 V while reading a temp of 41.58 C using the temperature function given with the configurator.
Thanks for the help so far!
vout=.0195*temp+.4, where temp is measured in degC.
so, (3.61800 - .400) / .0195 = 165.025641
which doesn't make any sense. I think you're measuring it wrong. Measure between the two black wires, not the red one.
my mistake. i was measuring Vce, rather than Vbe.
Vbe = .945 V
T = 42.33 Celc.
Plugging the numbers in, it makes sense that the calculated T would be around 27-28 degrees C. So would the fix be as easy as multiplying the temperature calculated by the given function by a factor of .66?
Sorry for the mixup...
Interesting. There was a bug in the firmware. Can you use the brain to measure a known voltage source, like a 1.5 volt battery, and report back?
Additionally, let us know what the brain measures the voltage as, without any temperature functions. You can use the virtual brain function for this, I think.