ARTMMA: Temperature Sensor Selection

DHT11 vs DHT22 temperature & humidity sensor

Objective

Determine what temperature sensor is best suited for the project.

Priorities in order of weight

1. Temperature accuracy

2. Low price

	DHT11	DHT22
Price (for 3)	$5.99 on Amazon	$9.99 on Amazon
Accuracy	±2°C	±0.5°C
Measuring Range	0-50°C	-40-80°C
Resolution	1°C	0.1°C

Analysis

1. Temperature accuracy

   1. Both sensors measure temperature within the expected range of my apartment. The extra high and low range of the DHT22 is nice, but not necessary for this project.

   2. The accuracy of the DHT22 far surpasses that of the DHT11, with 4 times more accurate data.

2. Low price

   1. Both sensors are relatively low-priced, so that consideration is null. I will count them as equal.

Why is accuracy important?

The purpose of this project is to analyse which room in my apartment is the coolest. Temperature data that is ±2°C inaccurate can widely skew the results, as the data may have only a ±2°C difference between the sensors.

Final product selection

The DHT22 is a more suitable sensor for this project due to its higher accuracy compared to the DHT11. 

Takeaways and next steps

The DHT22 temperature sensor was selected for the project. The next step is to select a project board for the sensor to connect to.

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References

1. DHT11 Sensor information and image https://www.waveshare.com/wiki/DHT11_Temperature-Humidity_Sensor 

2. DHT22 Sensor information and image https://www.waveshare.com/wiki/DHT22_Temperature-Humidity_Sensor