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    Can you hook up a voltmeter to the Vout of the TMP? If the voltage is actually that high, then yes, you've got a broken part. Try another TMP sensor. This is to just rule out the arduino. Commented Nov 5, 2015 at 17:12
  • When I connect a voltmeter to the TMP it says 5V. So it must be the part. Commented Nov 5, 2015 at 20:11
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    Yeah, must've gotten damaged somehow. Just for the sake of being thorough you could: 1. double check your circuit, 2. double check the the TMP orientation (I've hooked them up backwards before), 3. double check the supply voltage and make sure it's between 2.7v and 5.5v (per the data sheet). But, you probably already did these things. I just thought I should mention them just in case. Commented Nov 6, 2015 at 16:34
  • Thanks for the comment but yes, I checked all these multiple times. Too bad they only give you one TMP in the starter kit. Commented Nov 8, 2015 at 2:51
  • Just curious: where does the - .5 come from, in float temperature = (voltage - .5) * 100;? TMP35 outputs 10mv/degC, with 0v at 0degC. (Not that it would help if this is a coding error; it would make your results look 50degC higher.) Commented Oct 3, 2016 at 11:59