The DS18B20 sensor communicates using the “1-Wire” protocol, which means it uses a single data line for all communication with a microcontroller, allowing multiple sensors to be connected on the same line and identified by their unique 64-bit serial code; this single data line is pulled high with a resistor and the sensor transmits data by pulling the line low during specific time slots to send bits of information.
This article explains in detail the application of custom DS18B20 digital temperature sensor in building a digital thermometer. Including working principle, hardware connection, software programming and simulation implementation. Provide complete protues simulation diagram, C source code and result analysis to help readers deeply understand and practice the use of DS18B20.
O que são termistores NTC e PTC?
NTC e PTC são ambos termistores, que são resistores especiais que podem alterar a resistência com a temperatura. Eles também podem ser considerados uma espécie de sensor.
P: Você pode explicar a resolução de sensibilidade com mais detalhes? Por que valores mais altos são melhores?
UM: A alta sensibilidade elimina qualquer resistência do chumbo. Também simplifica a eletrônica de suporte. UM 10,000 ohm termistor altera a resistência em 4.4% ou 440 ohms para uma mudança de 1°C na temperatura. UM 100 ohm sensor de platina altera a resistência em 1/3 ohm para uma mudança de 1°C na temperatura.
Comparação entre a sonda do sensor de temperatura PT100 e o módulo DS18B20
1) Princípio básico de aquisição de sinal
① A resistência do PT100 muda proporcionalmente com a temperatura (quanto maior a temperatura, quanto maior a resistência), mas a mudança de resistência é muito pequena, sobre 0.385 Oh / grau;
NTC temperature sensor is a thermistor sensor (faixa de temperatura de medição: -30°C to +200°C (-22°F to +392°F) waterproof probe). Its resistance value changes with temperature. NTC (Negative Temperature Coefficient) means that its resistance value is negatively correlated with temperature, that is, as the temperature rises, the resistance value will decrease; conversely, as the temperature decreases, the resistance value will increase. This characteristic makes NTC temperature sensor very suitable for measuring temperature.
In modern sensing technology applications, (NTC, PTC, PT100, termopar, thermal resistor, DS18B20, etc.. cable, probe kit) temperature sensors are key measuring tools. They are widely used in industrial automation, agricultural monitoring, automobile manufacturing and other fields. In order to ensure that the temperature sensor can work stably and reliably in a humid or wet environment, waterproof and moisture-proof technology
The core technologies of sensor probes and temperature measurement cable kits involve temperature sensing, signal transmission and data processing. Temperature acquisition expert YAXUN uses high-precision Shibaura NTC thermistors for sensor temperature sensing harnesses, including sensing materials, signal processing technology, integrated design and future development trends.
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