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Bastiaan obtained a smoke detector to conform to rental requirements, but we might be able to make more out of it.
The device is little more than a logic board hooking up some simple input and output to a single chip: a BL59S10. Description is found here: http://www.ic-on-line.cn/download_online.php?id=1735991&pdfid=CDC69DF0A3440E4266570F38854F9232&file=0369%5Cbl59s10_3325034.pdf and mirrored locally
The interesting pin is 7: I/O. Although there are no specific details the description mentions that "It can be used to connect up to 40 detectors to make auxiliary alarm, remote alarm, auto dialer..."