kopia lustrzana https://github.com/jbruce12000/kiln-controller
276 wiersze
11 KiB
Python
276 wiersze
11 KiB
Python
import logging
|
|
import os
|
|
from digitalio import DigitalInOut
|
|
import busio
|
|
|
|
########################################################################
|
|
#
|
|
# General options
|
|
|
|
### Logging
|
|
log_level = logging.INFO
|
|
log_format = '%(asctime)s %(levelname)s %(name)s: %(message)s'
|
|
|
|
### Server
|
|
listening_port = 8081
|
|
|
|
########################################################################
|
|
# Cost Information
|
|
#
|
|
# This is used to calculate a cost estimate before a run. It's also used
|
|
# to produce the actual cost during a run. My kiln has three
|
|
# elements that when my switches are set to high, consume 9460 watts.
|
|
kwh_rate = 0.1319 # cost per kilowatt hour per currency_type to calculate cost to run job
|
|
kw_elements = 9.460 # if the kiln elements are on, the wattage in kilowatts
|
|
currency_type = "$" # Currency Symbol to show when calculating cost to run job
|
|
|
|
########################################################################
|
|
#
|
|
# Hardware Setup (uses BCM Pin Numbering)
|
|
#
|
|
# kiln-controller.py uses SPI interface from the blinka library to read
|
|
# temperature data from the adafruit-31855 or adafruit-31856.
|
|
# Blinka supports many different boards. I've only tested raspberry pi.
|
|
#
|
|
# First you must decide whether to use hardware spi or software spi.
|
|
#
|
|
# Hardware SPI
|
|
#
|
|
# - faster
|
|
# - requires 3 specific GPIO pins be used on rpis
|
|
#
|
|
# Software SPI
|
|
#
|
|
# - slower (which will not matter for reading a thermocouple
|
|
# - can use any GPIO pins
|
|
|
|
#######################################
|
|
# SPI pins if you choose hardware spi #
|
|
#######################################
|
|
# On the raspberry pi, you MUST use predefined
|
|
# pins for HW SPI. In the case of the adafruit-31855, only 3 pins are used:
|
|
#
|
|
# SPI0_SCLK = BCM pin 11 = CLK on the adafruit-31855
|
|
# SPI0_MOSI = BCM pin 10 = not connected
|
|
# SPI0_MISO = BCM pin 9 = D0 on the adafruit-31855
|
|
#
|
|
# plus a GPIO output to connect to CS. You can use any GPIO pin you want.
|
|
# I chose gpio pin 5:
|
|
#
|
|
# GPIO5 = BCM pin 5 = CS on the adafruit-31855
|
|
|
|
#######################################
|
|
# SPI pins if you choose software spi #
|
|
#######################################
|
|
# For software SPI, you can choose any GPIO pins you like.
|
|
# You must connect clock, mosi, miso and cs each to a GPIO pin
|
|
# and configure them below based on your connections.
|
|
|
|
|
|
#######################################
|
|
# SPI is Autoconfigured !!!
|
|
#######################################
|
|
# whether you choose HW or SW spi, it is autodetected. If you use the hw pins
|
|
# HW spi is assumed.
|
|
|
|
#######################################
|
|
# Output to control the relay
|
|
#######################################
|
|
# A single GPIO pin is used to control a relay which controls the kiln.
|
|
# I use GPIO pin 23.
|
|
|
|
try:
|
|
import board
|
|
spi_sclk = board.D11 #spi clock
|
|
spi_mosi = board.D10 #spi Microcomputer Out Serial In (not connected)
|
|
spi_miso = board.D9 #spi Microcomputer In Serial Out
|
|
spi_cs = board.D5 #spi Chip Select
|
|
gpio_heat = board.D23 #output that controls relay
|
|
except (NotImplementedError,AttributeError):
|
|
print("not running on blinka recognized board, probably a simulation")
|
|
|
|
#######################################
|
|
### Thermocouple breakout boards
|
|
#######################################
|
|
# There are only two breakoutboards supported.
|
|
# max31855 - only supports type K thermocouples
|
|
# max31856 - supports many thermocouples
|
|
max31855 = 1
|
|
max31856 = 0
|
|
# uncomment these two lines if using MAX-31856
|
|
import adafruit_max31856
|
|
thermocouple_type = adafruit_max31856.ThermocoupleType.K
|
|
|
|
# here are the possible max-31856 thermocouple types
|
|
# ThermocoupleType.B
|
|
# ThermocoupleType.E
|
|
# ThermocoupleType.J
|
|
# ThermocoupleType.K
|
|
# ThermocoupleType.N
|
|
# ThermocoupleType.R
|
|
# ThermocoupleType.S
|
|
# ThermocoupleType.T
|
|
|
|
########################################################################
|
|
#
|
|
# If your kiln is above the starting temperature of the schedule when you
|
|
# click the Start button... skip ahead and begin at the first point in
|
|
# the schedule matching the current kiln temperature.
|
|
seek_start = True
|
|
|
|
########################################################################
|
|
#
|
|
# duty cycle of the entire system in seconds
|
|
#
|
|
# Every N seconds a decision is made about switching the relay[s]
|
|
# on & off and for how long. The thermocouple is read
|
|
# temperature_average_samples times during and the average value is used.
|
|
sensor_time_wait = 2
|
|
|
|
|
|
########################################################################
|
|
#
|
|
# PID parameters
|
|
#
|
|
# These parameters control kiln temperature change. These settings work
|
|
# well with the simulated oven. You must tune them to work well with
|
|
# your specific kiln. Note that the integral pid_ki is
|
|
# inverted so that a smaller number means more integral action.
|
|
pid_kp = 10 # Proportional 25,200,200
|
|
pid_ki = 80 # Integral
|
|
pid_kd = 220.83497910261562 # Derivative
|
|
|
|
########################################################################
|
|
#
|
|
# Initial heating and Integral Windup
|
|
#
|
|
# this setting is deprecated and is no longer used. this happens by
|
|
# default and is the expected behavior.
|
|
stop_integral_windup = True
|
|
|
|
########################################################################
|
|
#
|
|
# Simulation parameters
|
|
simulate = False
|
|
sim_t_env = 65 # deg
|
|
sim_c_heat = 500.0 # J/K heat capacity of heat element
|
|
sim_c_oven = 5000.0 # J/K heat capacity of oven
|
|
sim_p_heat = 5450.0 # W heating power of oven
|
|
sim_R_o_nocool = 0.5 # K/W thermal resistance oven -> environment
|
|
sim_R_o_cool = 0.05 # K/W " with cooling
|
|
sim_R_ho_noair = 0.1 # K/W thermal resistance heat element -> oven
|
|
sim_R_ho_air = 0.05 # K/W " with internal air circulation
|
|
|
|
# if you want simulations to happen faster than real time, this can be
|
|
# set as high as 1000 to speed simulations up by 1000 times.
|
|
sim_speedup_factor = 1
|
|
|
|
|
|
########################################################################
|
|
#
|
|
# Time and Temperature parameters
|
|
#
|
|
# If you change the temp_scale, all settings in this file are assumed to
|
|
# be in that scale.
|
|
temp_scale = "f" # c = Celsius | f = Fahrenheit - Unit to display
|
|
time_scale_slope = "h" # s = Seconds | m = Minutes | h = Hours - Slope displayed in temp_scale per time_scale_slope
|
|
time_scale_profile = "m" # s = Seconds | m = Minutes | h = Hours - Enter and view target time in time_scale_profile
|
|
|
|
# emergency shutoff the profile if this temp is reached or exceeded.
|
|
# This just shuts off the profile. If your SSR is working, your kiln will
|
|
# naturally cool off. If your SSR has failed/shorted/closed circuit, this
|
|
# means your kiln receives full power until your house burns down.
|
|
# this should not replace you watching your kiln or use of a kiln-sitter
|
|
emergency_shutoff_temp = 2264 #cone 7
|
|
|
|
# If the current temperature is outside the pid control window,
|
|
# delay the schedule until it does back inside. This allows for heating
|
|
# and cooling as fast as possible and not continuing until temp is reached.
|
|
kiln_must_catch_up = True
|
|
|
|
# This setting is required.
|
|
# This setting defines the window within which PID control occurs.
|
|
# Outside this window (N degrees below or above the current target)
|
|
# the elements are either 100% on because the kiln is too cold
|
|
# or 100% off because the kiln is too hot. No integral builds up
|
|
# outside the window. The bigger you make the window, the more
|
|
# integral you will accumulate. This should be a positive integer.
|
|
pid_control_window = 5 #degrees
|
|
|
|
# thermocouple offset
|
|
# If you put your thermocouple in ice water and it reads 36F, you can
|
|
# set set this offset to -4 to compensate. This probably means you have a
|
|
# cheap thermocouple. Invest in a better thermocouple.
|
|
thermocouple_offset=0
|
|
|
|
# number of samples of temperature to take over each duty cycle.
|
|
# The larger the number, the more load on the board. K type
|
|
# thermocouples have a precision of about 1/2 degree C.
|
|
# The median of these samples is used for the temperature.
|
|
temperature_average_samples = 10
|
|
|
|
# Thermocouple AC frequency filtering - set to True if in a 50Hz locale, else leave at False for 60Hz locale
|
|
ac_freq_50hz = False
|
|
|
|
########################################################################
|
|
# Emergencies - or maybe not
|
|
########################################################################
|
|
# There are all kinds of emergencies that can happen including:
|
|
# - temperature is too high (emergency_shutoff_temp exceeded)
|
|
# - lost connection to thermocouple
|
|
# - unknown error with thermocouple
|
|
# - too many errors in a short period from thermocouple
|
|
# but in some cases, you might want to ignore a specific error, log it,
|
|
# and continue running your profile instead of having the process die.
|
|
#
|
|
# You should only set these to True if you experience a problem
|
|
# and WANT to ignore it to complete a firing.
|
|
ignore_temp_too_high = False
|
|
ignore_tc_lost_connection = False
|
|
ignore_tc_cold_junction_range_error = False
|
|
ignore_tc_range_error = False
|
|
ignore_tc_cold_junction_temp_high = False
|
|
ignore_tc_cold_junction_temp_low = False
|
|
ignore_tc_temp_high = False
|
|
ignore_tc_temp_low = False
|
|
ignore_tc_voltage_error = False
|
|
ignore_tc_short_errors = False
|
|
ignore_tc_unknown_error = False
|
|
|
|
# This overrides all possible thermocouple errors and prevents the
|
|
# process from exiting.
|
|
ignore_tc_too_many_errors = False
|
|
|
|
########################################################################
|
|
# automatic restarts - if you have a power brown-out and the raspberry pi
|
|
# reboots, this restarts your kiln where it left off in the firing profile.
|
|
# This only happens if power comes back before automatic_restart_window
|
|
# is exceeded (in minutes). The kiln-controller.py process must start
|
|
# automatically on boot-up for this to work.
|
|
# DO NOT put automatic_restart_state_file anywhere in /tmp. It could be
|
|
# cleaned up (deleted) by the OS on boot.
|
|
# The state file is written to disk every sensor_time_wait seconds (2s by default)
|
|
# and is written in the same directory as config.py.
|
|
automatic_restarts = True
|
|
automatic_restart_window = 15 # max minutes since power outage
|
|
automatic_restart_state_file = os.path.abspath(os.path.join(os.path.dirname( __file__ ),'state.json'))
|
|
|
|
########################################################################
|
|
# load kiln profiles from this directory
|
|
# created a repo where anyone can contribute profiles. The objective is
|
|
# to load profiles from this repository by default.
|
|
# See https://github.com/jbruce12000/kiln-profiles
|
|
kiln_profiles_directory = os.path.abspath(os.path.join(os.path.dirname( __file__ ),"storage", "profiles"))
|
|
#kiln_profiles_directory = os.path.abspath(os.path.join(os.path.dirname( __file__ ),'..','kiln-profiles','pottery'))
|
|
|
|
|
|
########################################################################
|
|
# low temperature throttling of elements
|
|
# kiln elements have lots of power and tend to drastically overshoot
|
|
# at low temperatures. When under the set point and outside the PID
|
|
# control window and below throttle_below_temp, only throttle_percent
|
|
# of the elements are used max.
|
|
# To prevent throttling, set throttle_percent to 100.
|
|
throttle_below_temp = 300
|
|
throttle_percent = 20
|