Opentherm Thermostat

maxuser74 · 30 December 2022 12:39

Hi guys,
I want to share my implementation of Opentherm Tasmota and its integration with a template node in Node Red Dashboard.
I use it to remotely command the central heating boiler into my holiday house.
The hardware is based on a Wemos D1 ESP8266, with just an Opentherm Shield for levels compensation and a DS18B20 digital temperature sensor.

This is the Dashboard Template i made (with some CSS involved):

on the left panel the measured temperature (DS18B20 sensor)
at its right, the temperature setpoint
at the far right, on top the power button which has three state, off (greyed out), auto (blue), heating on (red) ... this is a clickable / status button
at its bottom, the flame status (greyed = off, red = on)
under temp set point the two buttons to increase the temp set point or decrease it (clickable buttons with icons)
at the very bottom, a string with all the most important datas coming from Opentherm communication with boiler

Here with heating turned off, ambient temperature = 17,3 C and setpoint ad 19,5 C

Heating turned on (auto) but setpoint lower than ambient temperature

Heater turned on but flame not yet on.

Heating turned on and boiler flame on

In the opentherm message status row some informations are displayed, such as:
connection status
Flame modulation
Boiler temperature (measured)
Water temperature (measured)
Central heating status (1 / 0)
Flame status (1 / 0)
Boiler temperature (setpoint)
Water temperature (setpoint)
Water pressure
Fault status

I hope someone enjoy, feel free to ask for more information!

gerry · 30 December 2022 14:23

Would you perhaps share you code?

maxuser74 · 1 January 2023 17:52

Sure,
here it is.

Screenshot

Code

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                "pt": "flow",
                "to": "19.5",
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                "to": "20.0",
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 \n                <div layout=\"column\" flex=\"60\" class=\"roundme\">\n                    <div class=\"b1 centerme\">Temp Set</div>\n                    <div class=\"b2 centerme\"  ng-bind-html=\"temp_set_ | number: 1\" ></div>\n                </div>\n    \n                <div flex=\"40\" layout=\"column\">\n                    <div flex=\"50\" class=\"centerme roundme\" ng-click=\"click_power();\">\n                        <md-icon md-font-icon=\"power_settings_new\" style=\"font-size:32px\" ng-class=\"power_status_icon\"></md-icon>\n                    </div>\n                    <div flex=\"50\" class=\"centerme roundme\">\n                        <md-icon md-font-icon=\"local_fire_department\" style=\"font-size:32px\" ng-class=\"heating_status_icon\"></md-icon>\n                    </div>\n                </div>\n    \n            </div>\n            <div flex=\"30\">\n                <div layout=\"row\" style=\"height:100%\">\n                    <md-button flex=\"50\" 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       scope.temp_amb_ = msg.temp_amb;\n        }\n\n        if(msg.hasOwnProperty('heating')) {\n            if(msg.heating==\"on\") {\n                scope.temp_amb_status=\"gradient-2\";\n            }\n            if(msg.heating==\"off\") {\n                scope.temp_amb_status=\"\";\n            }     \n        }\n    \n        // Opentherm status\n        if(msg.hasOwnProperty('ot_status1')) {\n            scope.ot_status1 = msg.ot_status1;\n            scope.ot_status2 = msg.ot_status2;\n        }\n\n        // Power status check    \n        if(msg.hasOwnProperty('power_status')) {\n            if(msg.power_status==true) {\n                scope.power_status_icon=\"blue_color\";\n            }\n            if(msg.power_status==false) {\n                scope.power_status_icon=\"grey_color\";\n            }     \n        }\n\n        // Heating status check\n        if(msg.hasOwnProperty('heating_status')) {\n            if(msg.heating_status==1) {\n                scope.power_status_icon=\"red_color\";\n            }\n        }\n    \n        // Flame status check\n        if(msg.hasOwnProperty('flame_status')) {\n            if(msg.flame_status==true) {\n//                scope.heating_status_icon=\"red_color\";\n                scope.heating_status_icon=\"on_fire\";\n\n            }\n            if(msg.flame_status==false) {\n                scope.heating_status_icon=\"grey_color\";\n            }\n        }\n        // End flame status check //\n\n        return;\n    });  \n\n    scope.click_power = function() {\n        scope.send({ \"payload\": \"power\"});\n    }\n\n    scope.click_temp_plus = function() {\n        scope.send({ \"payload\": \"temp_plus\"});\n    }\n\n    scope.click_temp_minus = function() {\n        scope.send({ \"payload\": \"temp_minus\"});\n    }\n  \n})(scope);\n\n</script>\n\n",
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gerry · 1 January 2023 19:27

Absolutely outstanding, thanks

gerry · 2 January 2023 11:30

In case you didn't think about it I would set limits on how high or low you can set the temp. I use 10 as a low limit and 25 as a high limit. This is a personal just because for me.

maxuser74 · 2 January 2023 12:35

In case you didn't think about it I would set limits on how high or low you can set the temp. I use 10 as a low limit and 25 as a high limit. This is a personal just because for me.

You're absolutely right.
Thanks

TotallyInformation · 2 January 2023 14:27

You'd need to be rich to afford that in the UK right now. My max is 20!

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Opentherm Thermostat

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