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This experiment will reveal ability measuring of Humid sensor DHT22, SHT21, BME280. Also mention about how to calibrate them

I’ve got 3 sensors that can measure relative humidity of the air: BME280, SHT21, DHT22. They stated ability of measuring with accuracy +/-3% from range 20 to 80%

However, when testing in same condition for 3 sensor, I got 3 different results. Maybe one of them has reading correctly, or none of them is correct. So I decide to test it with some equipement.

I hope my experiment can help some one to make this kind of sensor to be correct.”

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