kopia lustrzana https://github.com/jbruce12000/kiln-controller
227 wiersze
8.9 KiB
Python
227 wiersze
8.9 KiB
Python
import logging
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import os
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from digitalio import DigitalInOut
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import busio
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try:
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import board
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except NotImplementedError:
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print("not running on Raspberry PI, assuming simulation")
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# FIX how to choose a thermocouple control board
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# FIX how to choose a microcontrol board (like rpi)
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########################################################################
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#
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# General options
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### Logging
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log_level = logging.INFO
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log_format = '%(asctime)s %(levelname)s %(name)s: %(message)s'
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### Server
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listening_port = 8081
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########################################################################
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# Cost Information
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#
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# This is used to calculate a cost estimate before a run. It's also used
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# to produce the actual cost during a run. My kiln has three
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# elements that when my switches are set to high, consume 9460 watts.
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kwh_rate = 0.1319 # cost per kilowatt hour per currency_type to calculate cost to run job
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kw_elements = 9.460 # if the kiln elements are on, the wattage in kilowatts
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currency_type = "$" # Currency Symbol to show when calculating cost to run job
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########################################################################
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#
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# Hardware Setup (uses BCM Pin Numbering)
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#
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# kiln-controller.py uses SPI interface from the blinka library to read
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# temperature data from the adafruit-31855 or adafruit-31856.
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# Blinka supports many different boards. I've only tested raspberry pi.
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#
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# SPI uses 3 or 4 pins. On the raspberry pi, you MUST use predefined
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# pins. In the case of the adafruit-31855, only 3 pins are used:
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#
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# SPI0_SCLK = BCM pin 11 = CLK on the adafruit-31855
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# SPI0_MOSI = BCM pin 10 = not connected
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# SPI0_MISO = BCM pin 9 = D0 on the adafruit-31855
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#
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# plus a GPIO output to connect to CS. You can use any GPIO pin you want.
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# I chose gpio pin 5:
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#
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# GPIO5 = BCM pin 5 = CS on the adafruit-31855
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#
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# To control the kiln, one gpio pin is used as an output. Pick any
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# you like. I chose gpio pin 23. This output is used to control a
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# zero-cross solid-state-relay.
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spi_sclk = board.D11 #spi clock
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spi_mosi = board.D10 #spi Microcomputer Out Serial In (not connected)
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spi_miso = board.D9 #spi Microcomputer In Serial Out
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spi_cs = board.D5 #spi Chip Select
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gpio_heat = board.D23 #output that controls relay
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### Thermocouple Adapter selection:
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# max31855 - bitbang SPI interface
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# max31856 - bitbang SPI interface. must specify thermocouple_type.
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max31855 = 1
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max31856 = 0
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# uncomment this if using MAX-31856
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#thermocouple_type = ThermocoupleType.S
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# here are the possible max-31856 thermocouple types
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# ThermocoupleType.B
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# ThermocoupleType.E
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# ThermocoupleType.J
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# ThermocoupleType.K
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# ThermocoupleType.N
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# ThermocoupleType.R
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# ThermocoupleType.S
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# ThermocoupleType.T
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########################################################################
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#
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# duty cycle of the entire system in seconds
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#
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# Every N seconds a decision is made about switching the relay[s]
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# on & off and for how long. The thermocouple is read
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# temperature_average_samples times during and the average value is used.
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sensor_time_wait = 2
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########################################################################
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#
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# PID parameters
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#
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# These parameters control kiln temperature change. These settings work
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# well with the simulated oven. You must tune them to work well with
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# your specific kiln. Note that the integral pid_ki is
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# inverted so that a smaller number means more integral action.
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pid_kp = 25 # Proportional 25,200,200
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pid_ki = 10 # Integral
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pid_kd = 200 # Derivative
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########################################################################
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#
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# Initial heating and Integral Windup
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#
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# this setting is deprecated and is no longer used. this happens by
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# default and is the expected behavior.
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stop_integral_windup = True
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########################################################################
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#
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# Simulation parameters
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simulate = False
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sim_t_env = 60.0 # deg C
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sim_c_heat = 500.0 # J/K heat capacity of heat element
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sim_c_oven = 5000.0 # J/K heat capacity of oven
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sim_p_heat = 5450.0 # W heating power of oven
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sim_R_o_nocool = 0.5 # K/W thermal resistance oven -> environment
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sim_R_o_cool = 0.05 # K/W " with cooling
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sim_R_ho_noair = 0.1 # K/W thermal resistance heat element -> oven
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sim_R_ho_air = 0.05 # K/W " with internal air circulation
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########################################################################
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#
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# Time and Temperature parameters
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#
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# If you change the temp_scale, all settings in this file are assumed to
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# be in that scale.
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temp_scale = "f" # c = Celsius | f = Fahrenheit - Unit to display
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time_scale_slope = "h" # s = Seconds | m = Minutes | h = Hours - Slope displayed in temp_scale per time_scale_slope
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time_scale_profile = "m" # s = Seconds | m = Minutes | h = Hours - Enter and view target time in time_scale_profile
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# emergency shutoff the profile if this temp is reached or exceeded.
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# This just shuts off the profile. If your SSR is working, your kiln will
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# naturally cool off. If your SSR has failed/shorted/closed circuit, this
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# means your kiln receives full power until your house burns down.
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# this should not replace you watching your kiln or use of a kiln-sitter
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emergency_shutoff_temp = 2264 #cone 7
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# If the current temperature is outside the pid control window,
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# delay the schedule until it does back inside. This allows for heating
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# and cooling as fast as possible and not continuing until temp is reached.
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kiln_must_catch_up = True
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# This setting is required.
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# This setting defines the window within which PID control occurs.
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# Outside this window (N degrees below or above the current target)
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# the elements are either 100% on because the kiln is too cold
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# or 100% off because the kiln is too hot. No integral builds up
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# outside the window. The bigger you make the window, the more
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# integral you will accumulate. This should be a positive integer.
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pid_control_window = 5 #degrees
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# thermocouple offset
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# If you put your thermocouple in ice water and it reads 36F, you can
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# set set this offset to -4 to compensate. This probably means you have a
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# cheap thermocouple. Invest in a better thermocouple.
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thermocouple_offset=0
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# number of samples of temperature to average.
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# If you suffer from the high temperature kiln issue and have set
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# honour_theromocouple_short_errors to False,
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# you will likely need to increase this (eg I use 40)
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temperature_average_samples = 40
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# Thermocouple AC frequency filtering - set to True if in a 50Hz locale, else leave at False for 60Hz locale
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ac_freq_50hz = False
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########################################################################
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# Emergencies - or maybe not
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########################################################################
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# There are all kinds of emergencies that can happen including:
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# - temperature is too high (emergency_shutoff_temp exceeded)
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# - lost connection to thermocouple
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# - unknown error with thermocouple
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# - too many errors in a short period from thermocouple
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# but in some cases, you might want to ignore a specific error, log it,
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# and continue running your profile instead of having the process die.
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#
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# You should only set these to True if you experience a problem
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# and WANT to ignore it to complete a firing.
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ignore_temp_too_high = False
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ignore_tc_lost_connection = False
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ignore_tc_cold_junction_range_error = False
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ignore_tc_range_error = False
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ignore_tc_cold_junction_temp_high = False
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ignore_tc_cold_junction_temp_low = False
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ignore_tc_temp_high = False
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ignore_tc_temp_low = False
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ignore_tc_voltage_error = False
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ignore_tc_short_errors = False
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ignore_tc_unknown_error = False
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# This overrides all possible thermocouple errors and prevents the
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# process from exiting.
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ignore_tc_too_many_errors = False
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########################################################################
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# automatic restarts - if you have a power brown-out and the raspberry pi
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# reboots, this restarts your kiln where it left off in the firing profile.
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# This only happens if power comes back before automatic_restart_window
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# is exceeded (in minutes). The kiln-controller.py process must start
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# automatically on boot-up for this to work.
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# DO NOT put automatic_restart_state_file anywhere in /tmp. It could be
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# cleaned up (deleted) by the OS on boot.
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# The state file is written to disk every sensor_time_wait seconds (2s by default)
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# and is written in the same directory as config.py.
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automatic_restarts = True
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automatic_restart_window = 15 # max minutes since power outage
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automatic_restart_state_file = os.path.abspath(os.path.join(os.path.dirname( __file__ ),'state.json'))
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########################################################################
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# load kiln profiles from this directory
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# created a repo where anyone can contribute profiles. The objective is
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# to load profiles from this repository by default.
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# See https://github.com/jbruce12000/kiln-profiles
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kiln_profiles_directory = os.path.abspath(os.path.join(os.path.dirname( __file__ ),"storage", "profiles"))
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#kiln_profiles_directory = os.path.abspath(os.path.join(os.path.dirname( __file__ ),'..','kiln-profiles','pottery'))
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