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klipper-dgus/klippy/extras/htu21d.py

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# HTU21D(F)/Si7013/Si7020/Si7021/SHT21 i2c based temperature sensors support
#
# Copyright (C) 2020 Lucio Tarantino <lucio.tarantino@gmail.com>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging
from . import bus
######################################################################
# NOTE: The implementation requires write support of length 0
# before reading on the i2c bus of the mcu.
#
# Compatible Sensors:
# HTU21D - Tested on Linux MCU.
# Si7013 - Untested
# Si7020 - Untested
# Si7021 - Untested
# SHT21 - Untested
#
######################################################################
HTU21D_I2C_ADDR= 0x40
HTU21D_COMMANDS = {
'HTU21D_TEMP' :0xE3,
'HTU21D_HUMID' :0xE5,
'HTU21D_TEMP_NH' :0xF3,
'HTU21D_HUMID_NH' :0xF5,
'WRITE' :0xE6,
'READ' :0xE7,
'RESET' :0xFE,
'SERIAL' :[0xFA,0x0F,0xFC,0xC9],
'FIRMWARE_READ' :[0x84,0xB8]
}
HTU21D_RESOLUTION_MASK = 0x7E;
HTU21D_RESOLUTIONS = {
'TEMP14_HUM12':int('00000000',2),
'TEMP13_HUM10':int('10000000',2),
'TEMP12_HUM08':int('00000001',2),
'TEMP11_HUM11':int('10000001',2)
}
# Device with conversion time for tmp/resolution bit
# The format is:
# <CHIPNAME>:{id:<ID>, ..<RESOlUTION>:[<temp time>,<humidity time>].. }
HTU21D_DEVICES = {
'SI7013':{'id':0x0D,
'TEMP14_HUM12':[.11,.12],
'TEMP13_HUM10':[ .7, .5],
'TEMP12_HUM08':[ .4, .4],
'TEMP11_HUM11':[ .3, .7]},
'SI7020':{'id':0x14,
'TEMP14_HUM12':[.11,.12],
'TEMP13_HUM10':[ .7, .5],
'TEMP12_HUM08':[ .4, .4],
'TEMP11_HUM11':[ .3, .7]},
'SI7021':{'id':0x14,
'TEMP14_HUM12':[.11,.12],
'TEMP13_HUM10':[ .7, .5],
'TEMP12_HUM08':[ .4, .4],
'TEMP11_HUM11':[ .3, .7]},
'SHT21': {'id':0x31,
'TEMP14_HUM12':[.85,.29],
'TEMP13_HUM10':[.43, .9],
'TEMP12_HUM08':[.22, .4],
'TEMP11_HUM11':[.11,.15]},
'HTU21D':{'id':0x32,
'TEMP14_HUM12':[.50,.16],
'TEMP13_HUM10':[.25, .5],
'TEMP12_HUM08':[.13, .3],
'TEMP11_HUM11':[.12, .8]}
}
#temperature coefficient for RH compensation at range 0C..80C,
# for HTU21D & SHT21 only
HTU21D_TEMP_COEFFICIENT= -0.15
#crc8 polynomial for 16bit value, CRC8 -> x^8 + x^5 + x^4 + 1
HTU21D_CRC8_POLYNOMINAL= 0x13100
class HTU21D:
def __init__(self, config):
self.printer = config.get_printer()
self.name = config.get_name().split()[-1]
self.reactor = self.printer.get_reactor()
self.i2c = bus.MCU_I2C_from_config(
config, default_addr=HTU21D_I2C_ADDR, default_speed=100000)
self.hold_master_mode = config.getboolean('htu21d_hold_master',False)
self.resolution = config.get('htu21d_resolution','TEMP12_HUM08')
self.report_time = config.getint('htu21d_report_time',30,minval=5)
if self.resolution not in HTU21D_RESOLUTIONS:
raise config.error("Invalid HTU21D Resolution. Valid are %s"
% '|'.join(HTU21D_RESOLUTIONS.keys()))
self.deviceId = config.get('sensor_type')
self.temp = self.min_temp = self.max_temp = self.humidity = 0.
self.sample_timer = self.reactor.register_timer(self._sample_htu21d)
self.printer.add_object("htu21d " + self.name, self)
self.printer.register_event_handler("klippy:connect",
self.handle_connect)
def handle_connect(self):
self._init_htu21d()
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 _init_htu21d(self):
# Device Soft Reset
self.i2c.i2c_write([HTU21D_COMMANDS['RESET']])
# Wait 15ms after reset
self.reactor.pause(self.reactor.monotonic() + .15)
# Read ChipId
params = self.i2c.i2c_read([HTU21D_COMMANDS['SERIAL'][2],
HTU21D_COMMANDS['SERIAL'][3]], 3)
response = bytearray(params['response'])
rdevId = response[0] << 8
rdevId |= response[1]
checksum = response[2]
if self._chekCRC8(rdevId) != checksum:
logging.warn("htu21d: Reading deviceId !Checksum error!")
rdevId = rdevId >> 8
deviceId_list = list(
filter(
lambda elem: HTU21D_DEVICES[elem]['id'] == rdevId,HTU21D_DEVICES)
)
if len(deviceId_list) != 0:
logging.info("htu21d: Found Device Type %s" % deviceId_list[0])
else:
logging.warn("htu21d: Unknown Device ID %#x " % rdevId)
if(self.deviceId != deviceId_list[0]):
logging.warn(
"htu21d: Found device %s. Forcing to type %s as config.",
deviceId_list[0],self.deviceId)
# Set Resolution
params = self.i2c.i2c_read([HTU21D_COMMANDS['READ']], 1)
response = bytearray(params['response'])
registerData = response[0] & HTU21D_RESOLUTION_MASK
registerData |= HTU21D_RESOLUTIONS[self.resolution]
self.i2c.i2c_write([HTU21D_COMMANDS['WRITE']],registerData)
logging.info("htu21d: Setting resolution to %s " % self.resolution)
def _sample_htu21d(self, eventtime):
try:
# Read Temeprature
if self.hold_master_mode:
params = self.i2c.i2c_write([HTU21D_COMMANDS['HTU21D_TEMP']])
else:
params = self.i2c.i2c_write([HTU21D_COMMANDS['HTU21D_TEMP_NH']])
# Wait
self.reactor.pause(self.reactor.monotonic()
+ HTU21D_DEVICES[self.deviceId][self.resolution][0])
params = self.i2c.i2c_read([],3)
response = bytearray(params['response'])
rtemp = response[0] << 8
rtemp |= response[1]
if self._chekCRC8(rtemp) != response[2]:
logging.warn("htu21d: Checksum error on Temperature reading!")
else:
self.temp = (0.002681 * float(rtemp) - 46.85)
logging.debug("htu21d: Temperature %.2f " % self.temp)
# Read Humidity
if self.hold_master_mode:
self.i2c.i2c_write([HTU21D_COMMANDS['HTU21D_HUMID']])
else:
self.i2c.i2c_write([HTU21D_COMMANDS['HTU21D_HUMID_NH']])
# Wait
self.reactor.pause(self.reactor.monotonic()
+ HTU21D_DEVICES[self.deviceId][self.resolution][1])
params = self.i2c.i2c_read([],3)
response = bytearray(params['response'])
rhumid = response[0] << 8
rhumid|= response[1]
if self._chekCRC8(rhumid) != response[2]:
logging.warn("htu21d: Checksum error on Humidity reading!")
else:
#clear status bits,
# humidity always returns xxxxxx10 in the LSB field
rhumid ^= 0x02;
self.humidity = (0.001907 * float(rhumid) - 6)
if (self.humidity < 0):
#due to RH accuracy, measured value might be
# slightly less than 0 or more 100
self.temp = 0
elif (self.humidity > 100):
self.humidity = 100
# Only for HTU21D & SHT21.
# Calculates temperature compensated Humidity, %RH
if( self.deviceId in ['SHT21','HTU21D']
and self.temp > 0 and self.temp < 80):
logging.debug("htu21d: Do temp compensation..")
self.humidity = self.humidity
+ (25.0 - self.temp) * HTU21D_TEMP_COEFFICIENT;
logging.debug("htu21d: Humidity %.2f " % self.humidity)
except Exception:
logging.exception("htu21d: Error reading data")
self.temp = self.humidity = .0
return self.reactor.NEVER
if self.temp < self.min_temp or self.temp > self.max_temp:
self.printer.invoke_shutdown(
"HTU21D temperature %0.1f outside range of %0.1f:%.01f"
% (self.temp, self.min_temp, self.max_temp))
measured_time = self.reactor.monotonic()
print_time = self.i2c.get_mcu().estimated_print_time(measured_time)
self._callback(print_time, self.temp)
return measured_time + self.report_time
def _chekCRC8(self,data):
for bit in range(0,16):
if (data & 0x8000):
data = (data << 1) ^ HTU21D_CRC8_POLYNOMINAL;
else:
data <<= 1
data = data >> 8
return data
def get_status(self, eventtime):
return {
'temperature': self.temp,
'humidity': self.humidity,
}
def load_config(config):
# Register sensor
pheater = config.get_printer().lookup_object("heaters")
for stype in HTU21D_DEVICES:
pheater.add_sensor_factory(stype, HTU21D)
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