Trouble with Basic Temperature Sensor

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hi all,

i'm having trouble nte 7225 temperature sensor. (data sheet: http://www.nteinc.com/specs/7200to7299/pdf/nte7225.pdf)

for 1 thing, diagram doesn't describe pins 5v/out/gnd, rather adj/v+/v-. i've tried wiring in different configurations; configurations make sensor hot immediately, i've avoided those. currently, i've wired sensor as if 5v/output/gnd. not cause sensor heat up, assume thing.

even when touch temperature sensor hot cup of tea, readings in serial monitor not change (besides usual fluctuation).

can me out?

thanks!

additional info

when list pin value directly serial monitor, values in 300's when plugged 3.3v power on arduino uno board. when plugged in 5v power, near 600 on pin value output. normal? should reading change depending on power source using?

additional additional info/questions

the spec sheet says sensor directly calibrated in kelvin. mean raw value getting analog pin in kelvin?

hello,

this device zener diode , need constant current source e. g. 1ma. voltage of diode varies @ 10mv/k. if temperature doesn't vary can take resistor, too. connect v- gnd, v+ 1 pin of resistor , other pin of resistor +5v. connect v+ analog input , read it. try resistor 1.8k. current around 1ma.

you can take lm35, no additional components needed. datasheet here: http://www.ti.com/general/docs/lit/getliterature.tsp?genericpartnumber=lm35&filetype=pdf. can @ blog post lm35: http://heliosoph.mit-links.info/connecting-an-arduino-with-a-lm35-temperature-sensor-special-issues. in first part find basic connection , operation.

elektrix


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