LM35:測定温度が不安点な原因について

Machida-san,

Thank you for your question. The temperature accuracy variation is worse than the environment likely because of noise, either on the VDD line or heavy capacitive loading on the output. From your schematic, I recommend switching the 0.1uF bypass capacitor for a 0.01uF bypass capacitor, which is recommended in the datasheet image that most closely matches your output filtering:

I would also perform averaging of your measurements. Most noise like this can be averaged out across a 10 measurement average, and this is a very common noise mitigation approach.

Regards

-Alex Thompson

Machida-san,

I consider averaging the analog output to be more common. Noise is a common issue on analog output devices, so if your system can accept the averaging time, I recommend it to reduce the impact of noisy outlier measurements.

Regards

-Alex Thompson