>PIRs on the side, rather than on the top ...
on second-thoughts, daft idea when there's a door !
>IR break-beam sensor ...
wonder if they wopuld have to be pulsed, for economy - ie: no idea about their power consumption ... ?
on second-thoughts, daft idea when there's a door !
>IR break-beam sensor ...
wonder if they wopuld have to be pulsed, for economy - ie: no idea about their power consumption ... ?
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