Wzór na opór cieplny ma postać Rt=Ro(1+A*t+B*t*t);Rt=Ro[1+A*t+B*t*t+C(t-100)*t*t*t], t oznacza temperaturę Celsjusza, RO to wartość oporu w zero stopni celsjusza, A, B, C są wszystkich określonymi współczynnikami, dla PT100, RO jest równe 100 ℃.
Czujnik PT100 nabiera temperatury poprzez pomiar zmiany rezystancji elektrycznej, który bezpośrednio koreluje z temperaturą, na którą jest narażony; wraz ze wzrostem temperatury, Wzrasta również opór elementu platyny w czujniku, umożliwiając precyzyjne obliczenie temperatury na podstawie tej zmiany rezystancji; esencjonalnie, the “100” w PT100 oznacza, że czujnik ma odporność 100 omów w temperaturze 0°C, i ta wartość zmienia się przewidywalnie wraz z fluktuacji temperatury.
Rezystory platynowe są szeroko stosowane w średnim zakresie temperatur (-200～ 650 ℃). Obecnie, Istnieją standardowe temperatury oporne termiczne wykonane z metalowej platyny na rynku, takie jak PT100, PT500, PT1000, itp.
The temperature measurement range of the commonly used platinum resistance Pt100 sensor probes is -200～850℃, and the temperature measurement ranges of Pt500, Pt1000 sensor probes, itp. are successively reduced. PT1000, temperature measurement range is -200～420℃. According to the IEC751 international standard, the temperature characteristics of the platinum resistor Pt1000 meet the following requirements:
The DS18B20 sensor communicates using the “1-Drut” 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.
What are thermistors NTC and PTC?
NTC and PTC are both thermistors, which are special resistors that can change resistance with temperature. They can also be said to be a kind of sensor.
Q: Can you explain sensitivity resolution in more detail? Why are higher values better?
A: High sensitivity eliminates any lead resistance. It also simplifies the supporting electronics. A 10,000 ohm thermistor changes resistance by 4.4% Lub 440 ohms for a 1°C change in temperature. A 100 ohm platinum sensor changes resistance by 1/3 ohm for a 1°C change in temperature.
Comparison between PT100 temperature sensor probe and DS18B20 module
1) Basic principle of signal acquisition
① The resistance of PT100 changes proportionally with the temperature (the higher the temperature, the greater the resistance), but the resistance change is very small, about 0.385 Oh / degree;
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