lm75: Added support for LM75/LM75A I2C connected temperature sensors (#3101)
Signed-off-by: Boleslaw Ciesielski <combolek@users.noreply.github.com>
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@ -1036,6 +1036,30 @@
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#htu21d_report_time:
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#htu21d_report_time:
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# interval in seconds between readings. Default is 30
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# interval in seconds between readings. Default is 30
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# LM75/LM75A two wire (I2C) connected temperature sensors.
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# These sensors have range up to 125 C, so are usable for e.g. chamber
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# temperature monitoring. They can also function as simple
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# fan/heater controllers but this mode is not used here.
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#[temperature_sensor my_sensor]
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# See the "temperature_sensor" section below for a description of its
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# parameters. The parameters below describe LM75 family sensor parameters.
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#sensor_type:
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# Must be "LM75"
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#i2c_address:
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# Default is 72 (0x48). Normal range is 72-79 (0x48-0x4F) and the 3 low
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# bits of the address are configured via pins on the chip (usually
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# with jumpers or hard wired).
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#i2c_mcu:
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# MCU the sensor is connected to. Default is the primary mcu.
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#i2c_bus:
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# The I2C bus the sensor is connected to. On some MCU platforms the default
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# is bus 0. On platforms without bus 0 this parameter is required.
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#i2c_speed:
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# The I2C speed (in Hz) to use when communicating with the sensor. Default
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# is 100000. On some MCUs changing this value has no effect.
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#lm75_report_time:
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# interval in seconds between readings. Default is 0.8, with minimum 0.5
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# Generic heaters (one may define any number of sections with a
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# Generic heaters (one may define any number of sections with a
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# "heater_generic" prefix). These heaters behave similarly to standard
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# "heater_generic" prefix). These heaters behave similarly to standard
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# heaters (extruders, heated beds). Use the SET_HEATER_TEMPERATURE
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# heaters (extruders, heated beds). Use the SET_HEATER_TEMPERATURE
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@ -261,7 +261,7 @@ class PrinterHeaters:
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return self.heaters[heater_name]
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return self.heaters[heater_name]
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def setup_sensor(self, config):
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def setup_sensor(self, config):
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modules = ["thermistor", "adc_temperature", "spi_temperature",
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modules = ["thermistor", "adc_temperature", "spi_temperature",
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"bme280", "htu21d"]
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"bme280", "htu21d", "lm75"]
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for module_name in modules:
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for module_name in modules:
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self.printer.load_object(config, module_name)
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self.printer.load_object(config, module_name)
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sensor_type = config.get('sensor_type')
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sensor_type = config.get('sensor_type')
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@ -0,0 +1,107 @@
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# Support for I2C based LM75/LM75A temperature sensors
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#
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# Copyright (C) 2020 Boleslaw Ciesielski <combolek@users.noreply.github.com>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import logging
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from . import bus
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LM75_CHIP_ADDR = 0x48
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LM75_I2C_SPEED = 100000
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LM75_REGS = {
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'TEMP' : 0x00,
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'CONF' : 0x01,
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'THYST' : 0x02,
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'TOS' : 0x03,
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'PRODID' : 0x07 # TI LM75A chips only?
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}
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LM75_REPORT_TIME = .8
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# Temperature can be sampled at any time but the read aborts
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# the current conversion. Conversion time is 300ms so make
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# sure not to read too often.
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LM75_MIN_REPORT_TIME = .5
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class LM75:
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def __init__(self, config):
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self.printer = config.get_printer()
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self.name = config.get_name().split()[-1]
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self.reactor = self.printer.get_reactor()
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self.i2c = bus.MCU_I2C_from_config(
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config,
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default_addr=LM75_CHIP_ADDR,
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default_speed=LM75_I2C_SPEED
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)
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self.mcu = self.i2c.get_mcu()
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self.report_time = config.getint(
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'lm75_report_time',
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LM75_REPORT_TIME,
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minval=LM75_MIN_REPORT_TIME
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)
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self.temp = 0.0
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self.sample_timer = self.reactor.register_timer(self._sample_lm75)
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self.printer.add_object("lm75 " + self.name, self)
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self.printer.register_event_handler("klippy:ready", self.handle_ready)
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def handle_ready(self):
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self._init_lm75()
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self.reactor.update_timer(self.sample_timer, self.reactor.NOW)
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def setup_minmax(self, min_temp, max_temp):
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pass
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def setup_callback(self, cb):
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self._callback = cb
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def get_report_time_delta(self):
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return self.report_time
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def degrees_from_sample(self, x):
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# The temp sample is encoded in the top 9 bits of a 16-bit
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# value. Resolution is 0.5 degrees C.
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return x[0] + (x[1] >> 7) * 0.5
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def _init_lm75(self):
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# Check and report the chip ID but ignore errors since many
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# chips don't have it
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try:
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prodid = self.read_register('PRODID', 1)[0]
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logging.info("lm75: Chip ID %#x" % prodid)
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except:
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pass
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def _sample_lm75(self, eventtime):
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try:
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sample = self.read_register('TEMP', 2)
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self.temp = self.degrees_from_sample(sample)
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except Exception:
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logging.exception("lm75: Error reading data")
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self.temp = 0.0
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return self.reactor.NEVER
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measured_time = self.reactor.monotonic()
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self._callback(self.mcu.estimated_print_time(measured_time), self.temp)
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return measured_time + self.report_time
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def read_register(self, reg_name, read_len):
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# read a single register
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regs = [LM75_REGS[reg_name]]
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params = self.i2c.i2c_read(regs, read_len)
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return bytearray(params['response'])
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def write_register(self, reg_name, data):
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if type(data) is not list:
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data = [data]
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reg = LM75_REGS[reg_name]
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data.insert(0, reg)
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self.i2c.i2c_write(data)
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def get_status(self, eventtime):
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return {
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'temperature': self.temp,
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}
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def load_config(config):
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# Register sensor
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pheaters = config.get_printer().load_object(config, "heaters")
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pheaters.add_sensor_factory("LM75", LM75)
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