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Mydin-UseCase-Basic-Thermostat (voir la source)
Version du 30 avril 2025 à 21:24
, 30 avril 2025 à 21:24→Forced Mode
{{underline|Remarks:}} forced state can also be used during a normal heating process to stop it. In such case, the forced state will get disabled when the lower temperature is reached.
{{underline|Remarks:}} forced state can also be used during a normal heating process to stop it. In such case, the forced state will get disabled when the lower temperature is reached.
== The code ==
Here is the code of [https://github.com/mchobby/micropython-mydin/blob/main/examples/backplanes/TwoRelay3Mod/async-thermostat2.py thermostat2.py] available in the repository.
<syntaxhighlight lang="python" line>
from mydin import configure
from mydin.pico import Pico3Mod
from mydin.backplane.relays import TwoRelay3Mod
from hyst import HeaterTh
import time, sys, asyncio
# Which Controler + Backplane to use
din = configure( Pico3Mod, TwoRelay3Mod )
thermostat = HeaterTh( 25, 2 ) # Thermostat
forced = None # Forced state (High=True,Low=False,None=None)
last_print = 1
# === OneWire bus & DS18B20 ===================
# When running DinControler asynchronously, a task
# is created to capture the DS18B20 temperature!
# The AsyncIO task is scheduled every 60 seconds
# (see pico.py; DS18B20_UPDATE_TIME)
async def loop( din ):
""" called again and again (like Arduino) """
global thermostat, forced, last_print
if din.temp_ds18b20==None:
await asyncio.sleep( 2 )
return
# User Force state change ?
if din.was_pressed( 0 ):
forced = not(din.rel1.value())
# Ask to reset forced state ?
if din.was_pressed( 1 ):
forced = None
# Increate / decrease setpoint
if din.was_pressed( 2 ):
thermostat.setpoint -= 1
print( 'setpoint @ %i °C' % thermostat.setpoint )
din.led2.on()
await asyncio.sleep_ms( 300 )
din.led2.off()
if din.was_pressed( 3 ):
thermostat.setpoint += 1
print( 'setpoint @ %i °C' % thermostat.setpoint )
din.led3.on()
await asyncio.sleep_ms( 300 )
din.led3.off()
# IF forced THEN apply forced state
if forced != None:
heat = forced
# Should we auto-reset the forced state
if (forced == thermostat.update( din.temp_ds18b20) ):
forced=None # Reset forced state
# IF not forced THEN follow thermostat
if forced==None:
heat = thermostat.update( din.temp_ds18b20 )
din.led1.value( forced!=None )
din.led0.value( heat )
din.rel1.value( heat )
# print status once every 2 seconds
if time.ticks_diff( time.ticks_ms(), last_print )>2000:
print( "[%s] %s °C - %s - %s" % (thermostat.setpoint, din.temp_ds18b20, "Heat" if heat else "...", "(forced)" if forced!=None else "") )
last_print = time.ticks_ms()
await asyncio.sleep_ms( 100 )
din.setup( setup=None, loop=loop )
din.run()
</syntaxhighlight>
== Improve it ==
In house, thermostat are associated with a scheduler used to define one or more day-time hours range for heating (the remaining being the night-time).
Some advanced thermostat can defines a day temperature and night temperature.
In such case, the forced mode could be used to switch between day-time and night-time (with the corresponding temperature).
{{traduction}}