The PICAXE 08M2 is relatively expensive considering it needs a bunch of other parts to function. I can get an ESP8266 microcontroller for £1.40 and use it without an RTC or, alternatively, I can get a DS3231 module for less than £1 which definitely does have alarm functions. I can then use it's square wave pin with a thyristor like I said earlier. You can use that pin to wake an Arduino so I don't see why it couldn't turn on a thyristor!
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