diff options
Diffstat (limited to 'klippy/heater.py')
| -rw-r--r-- | klippy/heater.py | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/klippy/heater.py b/klippy/heater.py index d41055e2..7ad2318c 100644 --- a/klippy/heater.py +++ b/klippy/heater.py @@ -5,8 +5,9 @@ # This file may be distributed under the terms of the GNU GPLv3 license. import math, logging, threading -# Mapping from name to Steinhart-Hart coefficients -Thermistors = { +# Available sensors +Sensors = { + # Common thermistors and their Steinhart-Hart coefficients "EPCOS 100K B57560G104F": ( 0.000722136308968056, 0.000216766566488498, 8.92935804531095e-08), "ATC Semitec 104GT-2": ( @@ -29,7 +30,7 @@ class PrinterHeater: error = error def __init__(self, printer, config): self.name = config.section - self.thermistor_c = config.getchoice('thermistor_type', Thermistors) + self.sensor_c = config.getchoice('sensor_type', Sensors) self.pullup_r = config.getfloat('pullup_resistor', 4700.) self.min_extrude_temp = config.getfloat('min_extrude_temp', 170.) self.min_temp = config.getfloat('min_temp') @@ -44,14 +45,14 @@ class PrinterHeater: algos = {'watermark': ControlBangBang, 'pid': ControlPID} algo = config.getchoice('control', algos) heater_pin = config.get('heater_pin') - thermistor_pin = config.get('thermistor_pin') + sensor_pin = config.get('sensor_pin') if algo is ControlBangBang and self.max_power == 1.: self.mcu_pwm = printer.mcu.create_digital_out( heater_pin, MAX_HEAT_TIME) else: self.mcu_pwm = printer.mcu.create_pwm( heater_pin, PWM_CYCLE_TIME, 0, MAX_HEAT_TIME) - self.mcu_adc = printer.mcu.create_adc(thermistor_pin) + self.mcu_adc = printer.mcu.create_adc(sensor_pin) adc_range = [self.calc_adc(self.min_temp), self.calc_adc(self.max_temp)] self.mcu_adc.set_minmax(SAMPLE_TIME, SAMPLE_COUNT, minval=min(adc_range), maxval=max(adc_range)) @@ -81,13 +82,13 @@ class PrinterHeater: def calc_temp(self, adc): r = self.pullup_r * adc / (1.0 - adc) ln_r = math.log(r) - c1, c2, c3 = self.thermistor_c + c1, c2, c3 = self.sensor_c temp_inv = c1 + c2*ln_r + c3*math.pow(ln_r, 3) return 1.0/temp_inv + KELVIN_TO_CELCIUS def calc_adc(self, temp): if temp is None: return None - c1, c2, c3 = self.thermistor_c + c1, c2, c3 = self.sensor_c temp -= KELVIN_TO_CELCIUS temp_inv = 1./temp y = (c1 - temp_inv) / (2*c3) |