Accurate Humidity Sensor Arduino

Grove temp humi sensor sht31 is a highly reliable accurate quick response and integrated temperature humidity sensor. Earlier this week i wrote an article about how to use the dht22 am2302 temperature and humidity sensor with interrupts on an arduino. For every percentage point increase it is a step or even a grade for the humidity sensor.

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The dht11 humidity and temperature sensor makes it really easy to add humidity and temperature data to your diy electronics projects.

Accurate humidity sensor arduino.

Small dimension ultra low power consumption more than 20m s signal transmission distance make it a good selection for various application environment. Learn how to use temperature and humidity sensor with arduino how to connect dht11 or dht22 temperature and humidity sensor to arduino how to program arduino step by step. The detail instruction code wiring diagram video tutorial line by line code explanation are provided to help you quickly get started with arduino. In normal projects dht11 is sufficient.

In this tutorial i ll first go into a little background about humidity then i ll explain how the dht11 measures humidity. The dht22 am2302 sensor is able to measure temperatures from 40 to 125 c with an accuracy of 0 5 c and relative humidity levels from 0 to 100 with an accuracy of 2 5 at extremes to 10 and 90. The sensor is calibrated directly in celsius degrees and the only functional mode is the analog output directly proportional to temperature. The detecting range of this sensor is 5 rh 99 rh and 40 c 80 c.

Operation outside this range is still possible just the accuracy might drop a bit. This i2c digital humidity sensor is an accurate and intelligent alternative to the much simpler humidity and temperature sensor sht15 breakout it has a typical accuracy of 2 with an operating range that s optimized from 5 to 95 rh. After spending more time with the dht22 am2302 sensor i ve learned the humidity part of the sensor is not accurate at all. Every sensor was calibrated in an accurate humidity room.

Because different precisions are to be achieved their manufacturing costs vary greatly and their selling prices vary widely. You can see that article here. The accuracy of measurement is the most important index of the humidity sensor. The dht22 sensor also known as the am2302 reference and his little brother the dht11 are temperature and humidity sensors.

This is the ideal sensor for arduino projects because it can be powered directly with 5v from the arduino s power pin and has only three pins one pin is for analog output and two for power supply. It s perfect for remote weather stations home environmental control systems and farm or garden monitoring systems.

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