LM35: A Not So Simple Temperature Sensor for The Arduino

Needs more than three wires to work as advertised.

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Revised LM35 circuit on breadboard with Arduino Uno in background. Image by C.D. Reimer.
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Image from “Reading The Room Temperature with an LM35 Sensor” by Rastating.
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Zeros and random numbers from LM35 with three wires to the Arduino. Image by C.D. Reimer.
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Image from Instructables.

Chinese Counterfeits From eBay

Unreliable Power Via USB Cable

Three Wires Weren’t Enough

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Image from LM35 Data Sheet (Texas Instruments)
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Revised LM35 circuit reporting room temperature. Image by C.D. Reimer.
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Revised LM35 circuit reporting a temperature spike. Image by C.D. Reimer.

C.D. Reimer makes videos about comic cons, pop culture, Silicon Valley and technology every week. https://www.youtube.com/c/cdreimer

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