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Just opening and closing a drawbridge door each day, and powering some timing circuits, would be a pretty modest power drain. I don't think we'd even need a motorcycle battery to do it. Some rechargeable C or D cells might even work... but with the cordless drill you don't even need that. You'd already have all the rechargeable battery you need right there.
Harbor Freight stuff is normally pretty cheap, you do get what you pay for, but you can make it work if you don't expect too much from it.
With the light-sensing system I'd like to do, I figured I'd put it on a time delay. Make it close 15 minutes or 1/2 hour after dark, and open 15 minutes or 1/2 hour after dawn. That might get into more technical stuff than most on the thread want to deal with though.
Just opening and closing a drawbridge door each day, and powering some timing circuits, would be a pretty modest power drain. I don't think we'd even need a motorcycle battery to do it. Some rechargeable C or D cells might even work... but with the cordless drill you don't even need that. You'd already have all the rechargeable battery you need right there.
Harbor Freight stuff is normally pretty cheap, you do get what you pay for, but you can make it work if you don't expect too much from it.
With the light-sensing system I'd like to do, I figured I'd put it on a time delay. Make it close 15 minutes or 1/2 hour after dark, and open 15 minutes or 1/2 hour after dawn. That might get into more technical stuff than most on the thread want to deal with though.