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Path: ...!3.eu.feeder.erje.net!feeder.erje.net!news2.arglkargh.de!news.mixmin.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: "R.Wieser" <address@is.invalid> Newsgroups: comp.sys.raspberry-pi Subject: Re: relay modules? Date: Wed, 10 Apr 2024 13:54:28 +0200 Organization: A noiseless patient Spider Lines: 23 Message-ID: <uv5um7$ufqb$1@dont-email.me> References: <uv5qtf$te0a$1@dont-email.me> Injection-Date: Wed, 10 Apr 2024 11:54:47 +0200 (CEST) Injection-Info: dont-email.me; posting-host="4f06182d33449eb764b45b50682db1a6"; logging-data="999243"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX199ENiK7CW2aiYETjwhU9zaUxGEdWR+iqgweR3es0xfZQ==" Cancel-Lock: sha1:Yur4Y0NUCB8r0bT1gUb3DkujIAs= X-MSMail-Priority: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512 X-Priority: 3 X-RFC2646: Format=Flowed; Response X-Newsreader: Microsoft Outlook Express 6.00.2900.5512 Bytes: 1855 Mike, > Second is something to switch mains safely - a full 13A to run a 3kW > heater. You could take a peek at so-called "solid state relais". And as your heater is a resistive load, it should be no problem to control it with even a simple one (no zero-pass detection needed, as is needed for inductive loads). One thing to check is what your heater pulls in the first seconds or so (up until its fully heated). That current might well be more than the 13A that it draws after those first few seconds. The last thing to check is (ofcourse) the voltage those solid-state relays "switch on" on. The Pi's 3.3 volt is on the low end, so you will likely need something to connect it to a higher voltage. A simple open-collector transistor should work though. Regards, Rudy Wieser