Kevin O'Connor f53897758d heater: Support max_power setting for heaters
Change the mcu PWM value from an integer (0-255) to a float (0. - 1.).
Add support for limiting the maximum power (as measured over a
sufficiently long duration) to a particular heater.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
2017-03-03 20:00:16 -05:00
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