NTC capteurs température » History » Version 3
Frédéric Blanc, 2021-05-20 11:31
| 1 | 1 | Frédéric Blanc | h1. NTC capteurs température |
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| 3 | 3 | Frédéric Blanc | h2. plugin Analog input thermistor |
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| 5 | https://www.letscontrolit.com/forum/viewtopic.php?t=7776 |
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| 7 | h2. ADS1115 |
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| 9 | 1 | Frédéric Blanc | https://www.giangrandi.org/electronics/ntc/ntc.shtml |
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| 11 | !clipboard-202105201030-v1vwo.png! |
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| 13 | ex R0=50K B=3950 T0=25°C =>298.15°K |
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| 14 | 2 | Frédéric Blanc | |
| 15 | !clipboard-202105201046-eb06u.png! |
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| 16 | |||
| 17 | <pre> |
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| 18 | <code> |
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| 19 | voltageDividerR1 = 3300 //tension pont 3.3V |
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| 20 | BValue = 3950 //constante NTC |
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| 21 | R1 = 10000 //résistance pont 10K |
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| 22 | T1 = 298.15 // temp 25°C |
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| 23 | NADC= 2^N-1 //bits ADC |
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| 24 | R2 = (voltageDividerR1*mesure)/(NADC-mesure) |
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| 25 | e = 2.718281828 |
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| 26 | |||
| 27 | a = 1/T1; |
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| 28 | b = log10(R1/R2) |
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| 29 | c = b / log10(e) |
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| 30 | d = c / BValue |
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| 31 | T2 = 1 / (a- d) |
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| 32 | tempcelsius=T2 - 273.15 |
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| 33 | </code> |
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| 34 | </pre> |