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# Support for Raspberry Pi temperature sensor
#
# Copyright (C) 2020 Al Crate <al3ph@users.noreply.github.com>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging
HOST_REPORT_TIME = 1.0
RPI_PROC_TEMP_FILE = "/sys/class/thermal/thermal_zone0/temp"
class Temperature_HOST:
def __init__(self, config):
self.printer = config.get_printer()
self.reactor = self.printer.get_reactor()
self.name = config.get_name().split()[-1]
self.path = config.get("sensor_path", RPI_PROC_TEMP_FILE)
self.temp = self.min_temp = self.max_temp = 0.0
self.printer.add_object("temperature_host " + self.name, self)
if self.printer.get_start_args().get("debugoutput") is not None:
return
self.sample_timer = self.reactor.register_timer(self._sample_pi_temperature)
try:
self.file_handle = open(self.path, "r")
except:
raise config.error("Unable to open temperature file '%s'" % (self.path,))
self.printer.register_event_handler("klippy:connect", self.handle_connect)
def handle_connect(self):
self.reactor.update_timer(self.sample_timer, self.reactor.NOW)
def setup_minmax(self, min_temp, max_temp):
self.min_temp = min_temp
self.max_temp = max_temp
def setup_callback(self, cb):
self._callback = cb
def get_report_time_delta(self):
return HOST_REPORT_TIME
def _sample_pi_temperature(self, eventtime):
try:
self.file_handle.seek(0)
self.temp = float(self.file_handle.read()) / 1000.0
except Exception:
logging.exception("temperature_host: Error reading data")
self.temp = 0.0
return self.reactor.NEVER
if self.temp < self.min_temp:
self.printer.invoke_shutdown(
"HOST temperature %0.1f below minimum temperature of %0.1f."
% (
self.temp,
self.min_temp,
)
)
if self.temp > self.max_temp:
self.printer.invoke_shutdown(
"HOST temperature %0.1f above maximum temperature of %0.1f."
% (
self.temp,
self.max_temp,
)
)
mcu = self.printer.lookup_object("mcu")
measured_time = self.reactor.monotonic()
self._callback(mcu.estimated_print_time(measured_time), self.temp)
return measured_time + HOST_REPORT_TIME
def get_status(self, eventtime):
return {
"temperature": round(self.temp, 2),
}
def load_config(config):
# Register sensor
pheaters = config.get_printer().load_object(config, "heaters")
pheaters.add_sensor_factory("temperature_host", Temperature_HOST)
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