92 wiersze
2.2 KiB
Python
92 wiersze
2.2 KiB
Python
#!/usr/bin/env python
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import math, numpy as np, matplotlib.pyplot as plt
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# Vref---R2---+---RT---gnd
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# |
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# +---R1---gnd
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# |
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# Vadc
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class Thermistor:
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def __init__ (self, R0_Ω, T0_C, β_K, R1, R2):
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self.β_K = β_K
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self.Ri = (R1 * R2) / (R1 + R2)
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self.Kv = 4096 * R1 / (R1 + R2)
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self.const = R0_Ω / math.exp (β_K / (T0_C + 273.15))
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def resistance (self, T_C):
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return self.const * math.exp (self.β_K / (T_C + 273.15))
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def adc (self, T_C, RT_Ω=None):
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if RT_Ω is None: RT_Ω = self.resistance (T_C)
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return round (self.Kv * RT_Ω / (RT_Ω + self.Ri))
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class DaVinci10E3Dv6 (Thermistor):
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def __init__ (self): # Semitec 104 GT-2
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Thermistor.__init__ (self, 1e5, 25, 4267, 10000, 4700)
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self.table = (
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(-20, 1127000.0),
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(-10, 620000.0),
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( 0, 353700.0),
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( 10, 208600.0),
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( 20, 126800.0),
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( 30, 79360.0),
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( 40, 50960.0),
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( 50, 33490.0),
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( 60, 22510.0),
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( 70, 15440.0),
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( 80, 10800.0),
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( 90, 7686.0),
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(100, 5556.0),
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(110, 4082.0),
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(120, 3043.0),
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(130, 2298.0),
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(140, 1758.0),
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(150, 1360.0),
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(160, 1064.0),
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(170, 841.4),
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(180, 671.4),
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(190, 540.8),
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(200, 439.3),
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(210, 359.7),
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(220, 296.9),
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(230, 246.8),
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(240, 206.5),
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(250, 174.0),
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(260, 147.5),
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(270, 125.8),
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(280, 107.9),
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(290, 93.05),
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(300, 80.65))
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def print_map (self):
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print ('#define EXT0_TEMPSENSOR_TYPE 7')
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print (f'#define NUM_TEMPS_USERTHERMISTOR2 {len(self.table)}')
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print ('#define USER_THERMISTORTABLE2 {', end = '')
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for t, r in reversed(self.table):
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a = self.adc(t, r)
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print (f'{{{a},{t*8}}},', end='')
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print ('}')
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if __name__ == '__main__':
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t = DaVinci10E3Dv6 ()
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t.print_map()
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print ('R@-20 =', t.resistance (-20), t.adc(-20))
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print ('R@25 =', t.resistance (25), t.adc(25))
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print ('R@300 =', t.resistance (300), t.adc(300))
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x = np.linspace (-20, 300, 33)
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y = [t.adc(i) for i in x]
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plt.plot(x, y)
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plt.grid()
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plt.show()
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