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topshed/Arduino - 5 - Temp sensor.md

Last active April 20, 2018 13:10
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Arduino - 5 - Temp sensor.md

Analog temperature sensor

This circuit demonstrates how to read the analog input from a TMP36 temperature sensor. This corresponds to the temperature measured by the sensor.

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The Arduino will give you a reading that you need to convert into temperature value. Because the TMP36 is connected to 5v we need to multiply the reading from the analog pin by 5. Then divide by 1024 (the Arduino uses a 10-bit analog to digital converter - this means that it will map input voltages between 0 and 5 volts into integer values between 0 and 1023).

Once you have a voltage reading, convert that to temperature: for the TMP36 there are 10 mv per degree, with a 500 mV offset

It may sound complicated but the code makes the mathematics easy!

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Can you add an LED or buzzer to warn of temperature changes?

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