Using the scale factor above, this means we can detect changes of 0.488☌, or about 0.87☏!
If we use an input voltage of 5V, the smallest change in temperature that we can detect is 4.88mV (5V/1024 steps). In our case, the ATmega’s analogRead() function has a 10-bit resolution (1024 steps). It’s a combination of the sensor’s innate resolution and the resolution of the reading device. The resolution of a sensor is the smallest change that it can detect. The TMP36 will accurately read temperatures between -40☌ to 125☌.Īnother important parameter of the temperature sensor is its scale factor, the change in voltage signal per degree Celsius.
The sensor’s operating range is the range in which it’ll record accurate data. This means 0☌ won’t correspond to 0V, and in the case of the TMP36, 500mV corresponds to 0☌. Typically, temperature sensors include a voltage offset to account for negative temperatures. It has a few important specs that you should get familiar with: The higher the temperature, the higher the returned signal. The TMP36 in your Kit is a standard linear sensor.
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