Capt. Flatus O'Flaherty ☠Finally, the timer chip and associated logic gates are working at all time intervals right across the full range.
The timer and logic circuit is shown in the photo above and occupies a footprint of 20 x 15 mm. There's plenty of opportunity for a bit more hacking, with pads for extra resistors and tracks for slight changes in the circuit, but for now it seems to work fine.
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