Differences
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pt100 [2017/05/18 01:33] 70.83.197.215 |
pt100 [2019/02/22 04:01] (current) 50.25.223.35 Cleaned up phrasing/grammar, added some missing articles. |
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| - | A [[https://en.wikipedia.org/wiki/Resistance_thermometer|PT100]] is a commonly used RTD. Compared to how Thermistor class works - it handles NTC's PT100 is PTC so the change in resistance with temperature is "other way around". PT100 also have very different curve than NTCs handled by Thermistor class. | + | A [[https://en.wikipedia.org/wiki/Resistance_thermometer|PT100]] is a commonly used RTD. Compared to NTC (the most common) thermistors work, the PT100 is "PTC" so the change in resistance with temperature is "other way around". (PT100's also have a very different curve than NTCs handled by Thermistor class.) |
| - | PTC means positive temperature coefficient so electrical resistance increases with raising temperature. They cannot be used as-is, you must use an amplifier circuit so they become usable by SmoothieBoard. | + | "PTC" means "positive temperature coefficient" so electrical resistance increases with raising temperature. They cannot be used as-is, you must use an amplifier circuit to raise the voltage change so they become usable by SmoothieBoard. |
| Currently Smoothie only supports E3D's PT100 amplifier board. Other PT100 amplifiers may be supported later (i.e. MAX31865 via SPI). | Currently Smoothie only supports E3D's PT100 amplifier board. Other PT100 amplifiers may be supported later (i.e. MAX31865 via SPI). | ||
