spi_temperature: Simplify and comment MAX31865 temperature calculations

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
2020-09-02 09:37:13 -04:00
parent 37d7742468
commit c69527e2b0
2 changed files with 22 additions and 19 deletions
--- a/klippy/extras/adc_temperature.py
+++ b/klippy/extras/adc_temperature.py
@@ -262,7 +262,7 @@ AD8497 = [
 ]

 def calc_pt100(base=100.):
-    # Calc PT100/PT1000 temperature/resistance pairs using formula
+    # Calc PT100/PT1000 resistances using Callendar-Van Dusen formula
    A, B = (3.9083e-3, -5.775e-7)
    return [(float(t), base * (1. + A*t + B*t*t)) for t in range(0, 500, 10)]