DS18B20 Temperature sensor

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Principle: The DS18B20 utilizes a digital temperature sensor, employing a single-wire interface to acquire temperature values by measuring the resistance associated with temperature inside the sensor. Conversely, the DHT11/DHT22 is a digital temperature and humidity sensor capable of simultaneously measuring temperature and humidity, and outputting data through a single-wire interface.

Output Format: The DS18B20 sensor outputs temperature values in digital format, facilitating direct retrieval of specific temperature values. Meanwhile, the DHT11/DHT22 sensor outputs temperature and humidity values in digital format, necessitating data packet parsing to derive specific temperature and humidity values.

Communication Protocol: Both DS18B20 and DHT11/DHT22 employ a single-wire communication protocol.
Measurement Range: The DS18B20 has a measurement range of -55°C to +125°C with an accuracy of ±0.5°C; the DHT11 has a measurement range of 0-50°C with an accuracy of ±2°C, and the DHT22 has a measurement range of -40°C to 80°C with an accuracy of ±0.5°C.

Accuracy Error: The temperature accuracy of the DS18B20 can reach ±0.5°C; the temperature accuracy of the DHT11 is ±2°C, with humidity accuracy of ±5%RH; the temperature accuracy of the DHT22 is ±0.5°C, with humidity accuracy of ±2%RH.

Supply Voltage: The supply voltage for DS18B20 ranges from 3V to 5.5V, while for DHT11/DHT22, it ranges from 3.3V to 5V.
Package Form: The DS18B20 generally employs TO-92 or stainless steel tube packaging, whereas the DHT11/DHT22 typically utilizes 4-pin DIP or 3-pin SMD packaging.

Product Size: The DS18B20 dimensions are 3mm x 5mm or 4520 mm, while the DHT11/DHT22 is larger with dimensions of 12mm x 15.5mm x 5.5mm.

In conclusion, the choice of sensor depends on the specific application scenario. If lower temperature measurement or higher measurement accuracy is required, then DS18B20 is more suitable. For simple single-wire communication and a measurement range between 0-50°C, DHT11 is preferable. If more precise measurement is needed, within a temperature range of -40°C to 80°C, DHT22 can be chosen.

Comparison Between DHT11 and DS18B20

Advantages of DHT11:
Cost-effective and relatively inexpensive.
Offers higher accuracy.
Comes with complete module packaging, making it easy to use.

Disadvantages of DHT11:
Slower reading speed, with a 2-second cycle requiring a waiting period during reading.
Limited to analog readings only, lacking support for digital signal output.
Poor model stability, susceptible to interference.

Advantages of DS18B20:
Provides digital signal output, ensuring high precision.
Compact size facilitates easy installation.
Offers excellent signal stability, less prone to interference.

Disadvantages of DS18B20:
Relatively higher price compared to DHT11.
Slower reading speed, requiring some time to complete readings.
Module packaging is not as comprehensive, necessitating the use of external circuits for operation.