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3 Commits

Author SHA1 Message Date
Kevin O'Connor 75b89f5261 thermistor: Fallback to using beta if Steinhart-Hart c3 is negative 
If the c3 coefficient is negative it can cause the adc calculations to
fail.  The c3 shouldn't be negative in practice, so fallback to a
simple beta calculation in that case.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
 2018-04-09 12:35:18 -04:00
Kevin O'Connor 8c8261ba80 thermistor: Add support for defining custom thermistors 
Add the ability to define a new thermistor type in the config file.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
 2018-04-09 12:17:39 -04:00
Kevin O'Connor 06d73207e7 heater: Move Thermistor and Linear to their own files in extras/ 
Move the Thermistor code to a new thermistor.py module.  Move the
Linear code to a new adc_temperature.py module.  This simplifies the
heater.py code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
 2018-04-04 23:14:55 -04:00