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--- ocrobot:alpha:pt100:main [2019/05/05 07:13] – [ALPHA PT100 电阻式温度传感器模块] 董凯萍
+++ ocrobot:alpha:pt100:main [2025/10/11 02:55] (当前版本) – 外部编辑 127.0.0.1
@@ 行 1: / 行 1: @@
+======ALPHA PT100 电阻式温度传感器模块======
+测量范围：-200℃～+850℃
+A级 精度为（0.15+0.002*|t|）摄氏度；
+测量范围：
+-50℃至+150℃（标准传感器）
+-80℃至+100℃（低温传感器）
+℃至+400℃（高温传感器）
+测量精度（根据传感器类型）：±0.05℃至±0.5℃
+传感器长度：标准为10-200mm
+传感器直径（根据传感器类型）：2mm – 3mm
+测量点位置（与传感器头部距离）：圆头：3mm 尖头：6mm
+分辨率：0.01℃
+反应时间（63%）：1秒（高温）0.5秒（其他）
+===== 特点 =====
+芯片为MAX3186
+传感器采用进口PT100 德国贺利氏铂电阻
+线是三线制高温镀银（三芯镀银线+镀银屏蔽线）
+四氟外皮（双包铁氟龙）耐高温达180度
+===== 参数 =====
+=====参考图片=====
+{{:ocrobot:alpha:pt100:未焊接侧面435.png?400|}}
+{{:ocrobot:alpha:pt100:未焊接正面435.png?400|}}
+=====例程=====
+<code cpp>
+/***************************************************
+  This is a library for the Adafruit PT100/P1000 RTD Sensor w/MAX31865
+  Designed specifically to work with the Adafruit RTD Sensor
+  ----> https://www.adafruit.com/products/3328
+  This sensor uses SPI to communicate, 4 pins are required to
+  interface
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit and open-source hardware by purchasing
+  products from Adafruit!
+  Written by Limor Fried/Ladyada for Adafruit Industries.
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+#include <Adafruit_MAX31865.h>
+// Use software SPI: CS, DI, DO, CLK
+Adafruit_MAX31865 max = Adafruit_MAX31865(10, 11, 12, 13);
+// use hardware SPI, just pass in the CS pin
+//Adafruit_MAX31865 max = Adafruit_MAX31865(10);
+// The value of the Rref resistor. Use 430.0 for PT100 and 4300.0 for PT1000
+#define RREF      390.0
+//OCROBOT ALPHA PT100需要改成390的电阻
+// The 'nominal' 0-degrees-C resistance of the sensor
+// 100.0 for PT100, 1000.0 for PT1000
+#define RNOMINAL  100.0
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Adafruit MAX31865 PT100 Sensor Test!");
+  max.begin(MAX31865_3WIRE);  // set to 2WIRE or 4WIRE as necessary
+}
+void loop() {
+  uint16_t rtd = max.readRTD();
+  Serial.print("RTD value: "); Serial.println(rtd);
+  float ratio = rtd;
+  ratio /= 32768;
+  Serial.print("Ratio = "); Serial.println(ratio,8);
+  Serial.print("Resistance = "); Serial.println(RREF*ratio,8);
+  Serial.print("Temperature = "); Serial.println(max.temperature(RNOMINAL, RREF));
+  // Check and print any faults
+  uint8_t fault = max.readFault();
+  if (fault) {
+    Serial.print("Fault 0x"); Serial.println(fault, HEX);
+    if (fault & MAX31865_FAULT_HIGHTHRESH) {
+      Serial.println("RTD High Threshold");
+    }
+    if (fault & MAX31865_FAULT_LOWTHRESH) {
+      Serial.println("RTD Low Threshold");
+    }
+    if (fault & MAX31865_FAULT_REFINLOW) {
+      Serial.println("REFIN- > 0.85 x Bias");
+    }
+    if (fault & MAX31865_FAULT_REFINHIGH) {
+      Serial.println("REFIN- < 0.85 x Bias - FORCE- open");
+    }
+    if (fault & MAX31865_FAULT_RTDINLOW) {
+      Serial.println("RTDIN- < 0.85 x Bias - FORCE- open");
+    }
+    if (fault & MAX31865_FAULT_OVUV) {
+      Serial.println("Under/Over voltage");
+    }
+    max.clearFault();
+  }
+  Serial.println();
+  delay(1000);
+}
+</code>
+===== 下载 =====
+**数据手册：**
+**原理图：**{{ :ocrobot:alpha:pt100:ocrobot_alpha_pt100_r1.pdf |ALPHA PT100 原理图}}
+**库**{{ :ocrobot:alpha:pt100:adafruit_max31865_library.zip |PT100库}}