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CAT # TMP-36 5 out of 5 stars(1 Review) Write a Review

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Product Description
Low voltage, precision centigrade temperature sensor. It provides a voltage output that is linearly proportional to the Celsius temperature. It also doesn't require any external calibration to provide typical accuracies of ±1°C at +25°C and ±2°C over the -40°C to +125°C temperature range. Easy to use: Just give the device a ground and 2.7 to 5.5 VDC and read the voltage on the Vout pin. The output voltage can be converted to temperature easily using the scale factor of 10 mV/°C.
Spec sheet available in PDF format.
WARNING: May cause cancer or reproductive harm.
California Prop. 65
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Customer Reviews 5 out of 5 stars(1 Review)

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It is what it says, but... 5 out of 5 stars

Reviewer: from Bend Oregon

This is what it says and it seems to work well in my testing. You will need to read the data sheet to get the *FULL* details on the voltage output.

My original plan was to simply strap this onto an ADC pin on a microcontroller and log away. Unfortunately the devil is in the details. I was using an Arduino Pro Mini clone (from here) that used a 5V input. This gave me about a 1F temp resolution. What I found is that the TMP36's voltage output is precisely tied to temperature while the values returned by the ADC were relative to the supply voltage. I'd get different readings at the same temp when powered by USB, wall wart, or batteries. It was really amusing to see the temperature escalate as the battery pack drained! I had to calibrate my code for the precise voltage differences in the power supply.

In short you need a precise voltage reference if you use ADC to read this device. I figure a 3V, instead of 5V, Arduino would improve things. Since there are other similarly priced parts out there that provide a digitized serial output they would probably be better for microcontroller use.

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