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Ligne 7 :
Ligne 7 : + + + + + + Ligne 14 :
Ligne 20 : − # * DS18B20 is connected to 1Wire port+ − # * Rel 1 control the Heater+ − # * LED 1 reflect the Rel 1 state.+ − #+ − # * Button 1 invert (force) the state of the relay. + − # * Forced state is canceled with the thermostat state reach the forced state+ − # * Forced state is canceled when the button 2 is pressed.+ − # * LED2 is lit while a forced state do applies+ − # * button 3 will decrease the setpoint T°. Led 3 will blick once to acknowledge.+ − # * button 4 will increase the setpoint T°. Led 4 will blink once to acknowledge.+ + + + + +
Mydin-UseCase-Basic-Thermostat (voir la source)
Version du 30 avril 2025 à 20:02
, 30 avril 2025 à 20:02→Basic Thermostat
* {{pl|2737|DINCASE-2R-BP3MOD}} : 2 relays backplane
* {{pl|2737|DINCASE-2R-BP3MOD}} : 2 relays backplane
* {{pl|151|TMP-DS18B20-WP}} : a DS18B20 OneWire temperature sensor.
* {{pl|151|TMP-DS18B20-WP}} : a DS18B20 OneWire temperature sensor.
A thermostat allows to define a temperature called the setpoint (eg: 25°C) and use an hysteresis range (EG: 2.5°C) to avoids continuous state change around the target temperature.
[[Fichier:heater-hysteresis.jpg]]
With the hysteresis, the heater starts heating from 25-2.5 = '''22.5°C''' and will stop heating when the temperature raised above 25+2.5 = '''27.5°C'''. The temperature will slowly decrease and the heater will start again when temperature falls under 22.5°C.
[[Fichier:MyDin-3modules.jpg|640px]]
[[Fichier:MyDin-3modules.jpg|640px]]
[[Fichier:MyDin-3modules-usage.jpg]]
[[Fichier:MyDin-3modules-usage.jpg]]
* LED 1 reflect the Rel 1 state (so heating state).
* LED 2 is lit while a FORCED forced is currently active
* LED 3 will blink once to acknowledge T° increase.
* LED 4 will blink once to acknowledge T° decrease.
* BUTTON 1 reverse (force) the current state of the relay.<br />When the relay is ON then it switch it off.<br />When the relay is OFF then is switch it on.
* BUTTON 2 cancel the forced state.
* BUTTON 3 will decrease the setpoint T° of 1 degree.
* BUTTON 4 will increase the setpoint T° of 1 degree.
Current temperature, setpoint temperature and relay state is displayed in the REPL session.
{{underline|'''Important remark''':}}<br />
Forced state is canceled when the temperature reach the setpoint temperature corresponding the forced state.
Let say that