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# AHT10/AHT20/AHT21 I2c-based humiditure sensor support
#
# Copyright (C) 2023 Scott Mudge <mail@scottmudge.com>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging
from . import bus
######################################################################
# Compatible Sensors:
# AHT10 - Tested w/ BTT GTR 1.0 MCU on i2c3
# AHT20 - Untested but should work
# AHT21 - Tested w/ BTT GTR 1.0 MCU on i2c3
######################################################################
AHT10_I2C_ADDR = 0x38
AHT10_COMMANDS = {
"INIT": [0xE1, 0x08, 0x00],
"MEASURE": [0xAC, 0x33, 0x00],
"RESET": [0xBA, 0x08, 0x00],
}
AHT10_MAX_BUSY_CYCLES = 5
class AHT10:
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=AHT10_I2C_ADDR, default_speed=100000
)
self.report_time = config.getint("aht10_report_time", 30, minval=5)
self.temp = self.min_temp = self.max_temp = self.humidity = 0.0
self.sample_timer = self.reactor.register_timer(self._sample_aht10)
self.printer.add_object("aht10 " + self.name, self)
self.printer.register_event_handler("klippy:connect", self.handle_connect)
self.is_calibrated = False
self.init_sent = False
def handle_connect(self):
self._init_aht10()
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 self.report_time
def _make_measurement(self):
if not self.init_sent:
return False
data = None
is_busy = True
cycles = 0
try:
while is_busy:
# Check if we're constantly busy. If so, send soft-reset
# and issue warning.
if is_busy and cycles > AHT10_MAX_BUSY_CYCLES:
logging.warning(
"aht10: device reported busy after "
+ "%d cycles, resetting device" % AHT10_MAX_BUSY_CYCLES
)
self._reset_device()
data = None
break
cycles += 1
# Write command for updating temperature+status bit
self.i2c.i2c_write(AHT10_COMMANDS["MEASURE"])
# Wait 110ms after first read, 75ms minimum
self.reactor.pause(self.reactor.monotonic() + 0.110)
# Read data
read = self.i2c.i2c_read([], 6)
if read is None:
logging.warning("aht10: received data from" + " i2c_read is None")
continue
data = bytearray(read["response"])
if len(data) < 6:
logging.warning(
"aht10: received bytes less than"
+ " expected 6 [%d]" % len(data)
)
continue
self.is_calibrated = True if (data[0] & 0b00000100) else False
is_busy = True if (data[0] & 0b01000000) else False
if is_busy:
return False
except Exception as e:
logging.exception(
"aht10: exception encountered" + " reading data: %s" % str(e)
)
return False
temp = ((data[3] & 0x0F) << 16) | (data[4] << 8) | data[5]
self.temp = ((temp * 200) / 1048576) - 50
hum = ((data[1] << 16) | (data[2] << 8) | data[3]) >> 4
self.humidity = int(hum * 100 / 1048576)
# Clamp humidity
if self.humidity > 100:
self.humidity = 100
elif self.humidity < 0:
self.humidity = 0
return True
def _reset_device(self):
if not self.init_sent:
return
# Reset device
self.i2c.i2c_write(AHT10_COMMANDS["RESET"])
# Wait 100ms after reset
self.reactor.pause(self.reactor.monotonic() + 0.10)
def _init_aht10(self):
# Init device
self.i2c.i2c_write(AHT10_COMMANDS["INIT"])
# Wait 100ms after init
self.reactor.pause(self.reactor.monotonic() + 0.10)
self.init_sent = True
if self._make_measurement():
logging.info(
"aht10: successfully initialized, initial temp: "
+ "%.3f, humidity: %.3f" % (self.temp, self.humidity)
)
def _sample_aht10(self, eventtime):
if not self._make_measurement():
self.temp = self.humidity = 0.0
return self.reactor.NEVER
if self.temp < self.min_temp or self.temp > self.max_temp:
self.printer.invoke_shutdown(
"AHT10 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 get_status(self, eventtime):
return {
"temperature": round(self.temp, 2),
"humidity": self.humidity,
}
def load_config(config):
# Register sensor
pheater = config.get_printer().lookup_object("heaters")
pheater.add_sensor_factory("AHT10", AHT10)
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