Timeline for How does this circuit work (OpenTherm)?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Dec 5, 2022 at 16:35 | answer | added | Christophe | timeline score: 0 | |
| Oct 9, 2022 at 10:05 | comment | added | Adam Ocsvari | If I understand well these and similar OpenTherm Master implementations, it needs an external 3.3V power source. However the actual Thermostat can be powered by the OpenTherm wires. Did anyone see a circuit where, for example with a voltage regulator, the 3,3V power is supplied from the OpenTherm wires and not from externally? | |
| Apr 9, 2020 at 6:00 | history | tweeted | twitter.com/StackElectronix/status/1248128633253888002 | ||
| Feb 12, 2020 at 22:04 | history | edited | rustyx | CC BY-SA 4.0 |
added 8 characters in body; edited title
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| Feb 12, 2020 at 21:07 | answer | added | Bigjim | timeline score: 3 | |
| Jan 16, 2020 at 10:01 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Nov 11, 2019 at 12:22 | history | edited | rustyx | CC BY-SA 4.0 |
added 340 characters in body
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| Nov 11, 2019 at 11:38 | answer | added | Dorian | timeline score: 1 | |
| Nov 11, 2019 at 1:53 | comment | added | jonk | I don't know anything about OpenTherm. But it looks as though it is supposed to connect a boiler and a thermostat directly to each other (boiler powers thermostat.) Your interface appears to depend upon some unknown (to me) boiler circuitry (which supplies power to the circuit you show) and is designed to communicate with an MCU, which isn't part of the specification. There should be another circuit for the MCU to talk with a thermostat, which expects a boiler but is really talking with an MCU. (And also isn't part of the spec.) I think we need OpenTherm spec details. Or, at least, I do. | |
| Nov 10, 2019 at 21:57 | history | asked | rustyx | CC BY-SA 4.0 |