jemhayward wrote: > Ah! I think I can modify this to do what I want. If I use a relay held > open by the offboard PSU 5v and a 6V rechargeable battery pack (need to > isolate the relay from the battery pack somehow...) then when the > external PSU goes down, the relay closes, and that initiates shutdown, > and then the 6V battery powers the board until its completely shut down. > I then need a way to disconnect the battery, or it will go flat - or I > could possibly use a big capacitor? I believe I've seen a UPS for the Raspberry Pi somewhere. Maybe that could be adapted somehow?
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