ฟังก์ชั่นและการใช้งาน Ds18b20 Sensor Probe

A DS18B20 sensor probe is a small, digital temperature sensor that measures temperature using a 1-Wire communication protocol, allowing it to be connected to a microcontroller using only one data wire, making it ideal for applications where multiple temperature readings are needed from various locations with minimal wiring complexity; it is commonly used in applications like environmental monitoring, ระบบปรับอากาศ, การควบคุมกระบวนการทางอุตสาหกรรม, and even basic DIY projects due to its affordability and ease of use.
The core functionality of the DS18B20 Sensor Probe is its direct-to- digital temperature sensor. The resolution of the tempera- ture sensor is user-configurable to 9, 10, 11, หรือ 12 bits, corresponding to increments of 0.5°C, 0.25องศาเซลเซียส, 0.125องศาเซลเซียส, and 0.0625°C, ตามลำดับ. The default resolution at power-up is 12-bit.

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The working principle of DS18B20 is that the oscillation frequency of the low temperature coefficient crystal is little affected by temperature, and is used to generate a fixed frequency pulse signal to be sent to counter 1. The oscillation frequency of the high temperature coefficient crystal changes significantly with temperature, and the generated signal is used as the pulse input of counter 2. The number of bits of the obtained temperature value varies with the resolution, and the delay time during temperature conversion is reduced from 2s to 750ms.

Key features of a DS18B20 sensor probe:
Digital Temperature Measurement:
Provides a precise digital temperature reading in Celsius, with customizable resolution between 9-bit and 12-bit.

One-Wire Interface:
Communicates with a microcontroller using only one data line, allowing for multiple sensors to be connected on a single pin.

Unique Identifier:
Each sensor has a unique 64-bit serial code, enabling identification of individual sensors on a bus.

Parasite Power Mode:
Can be powered directly from the data line in certain situations, eliminating the need for separate power supply.

Wide Temperature Range:
Operates over a broad temperature range, typically from -55°C to 125°C.

Applications of the DS18B20 sensor probe:
Its appearance is mainly changed according to different application occasions. The packaged DS18B20 can be used for temperature measurement in cable trenches, blast furnace water circulation, boilers, machine rooms, agricultural greenhouses, clean rooms, ammunition depots, and other non-extreme temperature occasions. Wear-resistant and collision-resistant, small in size, easy to use, and with various packaging forms, it is suitable for digital temperature measurement and control of various narrow space equipment;
Home Automation: Monitoring room temperatures for smart thermostats;
Environmental Monitoring: Tracking temperature changes in outdoor environments;
Industrial Process Control: Monitoring temperatures within industrial machinery and processes;
Data Logging: Recording temperature data over time with a microcontroller;
Scientific Research: Measuring temperatures in experiments;
This product is suitable for temperature measurement and control in freezers, granaries, storage tanks, telecommunications rooms, power rooms, cable ducts, ฯลฯ.
Bearings, cylinders, textile machines, เครื่องปรับอากาศ, and other narrow space industrial equipment temperature measurement and control.
Automotive air conditioners, ตู้เย็น, freezers, and medium and low temperature drying ovens, ฯลฯ.
Heat metering of heating/cooling pipelines, household heat metering of central air conditioners, and temperature measurement and control in the industrial field.

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How it works:
1. Connection:
The sensor is connected to a microcontroller’s digital pin with a pull-up resistor on the data line.
2. Communication:
The microcontroller sends commands to the sensor through the 1-Wire protocol to initiate temperature measurement.
3. Temperature Conversion:
The sensor internally converts the temperature into a digital value.
4. Data Readout:
The microcontroller reads the digital value from the sensor, which is then converted into a temperature reading in Celsius.