If you want to get fancy you could modify Lady Heather to do the deed. Heather
has a "singing clock" mode and a cuckoo/chime clock mode for playing sound
files at various times. It also has routines for controlling the serial port
DTR and RTS lines (currently used for PWMing a fan if temperature control mode
is enabled). You could add some code to the program to pulse the DTR or RTS
line... these can easily drive a solid state relay.
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