描述
SparkFun Thermocouple Breakout – MAX31855K 熱電偶感測器模組 -200°C至+ 700°C溫度讀數
SparkFun MAX31855K熱電偶感測器模組是一款簡單的14位分辨率SPI兼容型串行接口熱電偶數字轉換器，可讀取各種溫度範圍。熱電偶的工作原理是用兩根不同種類的金屬絲在兩端連接，在一端和另一端（“熱”端和“冷”端）之間形成溫度梯度。一旦達到這一點，電壓就會形成，電流就會流動。SparkFun熱電偶分接頭在一端採用標準的Type-K型熱電偶，將測量的溫度數字化，並通過SPI接口將數據從另一端發送出去，從而解釋數據並翻譯以供您閱讀！
使用SparkFun熱電偶分接開關，熱電偶的熱結可在-200°C至+ 700°C之間讀取，精度為±2°C，而MAX31855K內部的冷端僅可在-20°C至+ 85°C，同時保持±2°C的準確度。MAX31855K使用內部溫度檢測二極管來持續測量冷端溫度。MAX31855K需要一個+ 3.0V至+ 3.6V（+ 3.0V標稱值）的電源，最大值僅為1.5mA。
- 14位分辨率
- SPI兼容的串行接口
- -200°C至+ 700°C溫度讀數，精度±2°C
- 3.0V至3.6V（+ 3.0V標稱）要求
- 接受K型熱電偶
原廠技術文件與範例
- Schematic 概要
- Eagle PCB設計圖
- Hookup Guide 使用教學說明
- Datasheet (MAX31855K)
- GitHub (Design Files)
- GitHub (Library & Example Code)
The SparkFun MAX31855K Thermocouple Breakout is a simple 14-bit resolution, SPI-compatible, serial interface thermocouple digitizer that makes reading a wide range of temperatures possible. A thermocouple works by taking two wires made of dissimilar metals, connecting them at the two ends, and making a temperature gradient between one end and the other (a ‘hot’ end and a ‘cold’ one). Once this is achieved, a voltage potential is formed and current flows. The SparkFun Thermocouple Breakout takes a standard Type-K thermocouple in one end, digitizes the temperature measured and sends that data out the other end via a SPI interface, thereby interpreting the data and translating it for you to read! With the SparkFun Thermocouple Breakout, the thermocouple’s hot junction can be read from -200°C to +700°C with an accuracy of ±2°C while the cold junction, inside the MAX31855K, can only range from -20°C to +85°C while maintaining ±2°C accuracy. The MAX31855K constantly measures the temperature of the cold junction using an internal temperature-sensing diode. The MAX31855K requires a power source from +3.0V to +3.6V (+3.0V nominal) and only draws 1.5mA maximum. The Thermocouple Breakout is designed to accept a standard thermocouple connector, for convenience and compatibility with probes you may already own. These connectors aren’t necessary, and you could solder a thermocouple directly into the through-holes labeled ‘+’ and ‘-’. If you decide to solder the thermocouple directly to the breakout board, it is recommended that the thermocouple be mounted for strain relief to avoid breaking the thin wires. Notches for a zip-tie or wire wrapping have been provided in the PCB opposite the header for this purpose.
規格與特色
- 14-bit Resolution
- SPI-Compatible, Serial Interface
- -200°C to +700°C Temperature Reading with ±2°C Accuracy
- 3.0V to 3.6V (+3.0V nominal) Required
- Accepts Type-K Thermocouple
