按照温度系数不同,可分为正温度系数热敏电阻(PTC)、负温度系数热敏电阻(NTC)和临界负温度系数热敏电阻(CTR)。PTC随着温度升高,表现出的电阻值越大; NTC随着温度升高,表现出的电阻值越低;CTR具有负电阻突变特性,在某一温度下,电阻值随温度的增加急剧减小,具有很大的负温度系数。 由于具有不同的特性,热敏电阻的用途...
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lcd.print(t); // Prints the temperature value from the sensor lcd.print(" C");lcd.setCursor(...
If you are using an original DHT22 sensor then it will have a NTC thermistor and the sensor module inside it, but most of the sensors that you can find in the market are mostly non genuine parts and inside that you will find a small sensor that you can see in the image below. The...
NTC热敏电阻是最常用的测温型热敏电阻,电阻阻值随温度按指数型变化(如图一)。它的非线性使得它在测量大范围的温度时准确率降低,最常用的测温区间是0-50。热敏电阻的电阻与温度的表达式[5]为:其中Rth(T)是温度为T时热敏电阻的阻值,B是热敏电阻的敏感度,R25是温度为25°C的电阻值。图四:NTC热阻的R-T曲线测温...
We give you an inside look as we show you howwe hacked together a DIY temperature sensing devicein no time. And, because we used an NTC thermistor temperature sensor, this device will provide greater accuracy. We’ve also discovered whether you’re new to electrical engineering or you’re ...
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DHT11 温度和湿度传感器具有温度和湿度传感器复合体,具有校准的数字信号输出。采用独有的数字信号采集技术和温湿度传感技术,确保高可靠性和出色的长期稳定性。该传感器包括一个电阻式湿度测量元件和一个NTC温度测量元件,并连接到一个高性能8位微控制器,具有卓越的品质、快速的响应、抗干扰能力和成本效益。
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因此每度可以有100欧姆或更多的变化！术语“NTC”的意思是“负温度系数（Negative Temperature Coefficient...