I've done a bunch of "blinkenlights" -type projects, but my current thing will need to be more polished and user-friendly. It's a small, low-draw, battery-powered, output-mostly device. I think it shouldn't have a power button; it really needs to be either "on," or "off because it needs to be recharged." So I'm trying to figure out how to implement this (other than just direct-wire the battery and let the device run the battery completely flat.)
I'm thinking about a low-side FET with a gate pull-down to control the microcontroller ground connection. Connecting to the charger will pull the gate up and turn on the uC, then the uC will keep its own power turned on until it sees the battery get too low. Then, it'll turn itself off by discharging the gate, and it'll stay off until connected to the charger again. This seems a little dodgy to me, though, so I ask you professional consumer-electronics people: what's a cheap, reliable way to turn the power to a device on and off under the device's own control, without requiring user interaction or a switch? Thanks, -- Mersenne Law LLP · www.mersenne.com · +1-503-679-1671 - Small Business, Startup and Intellectual Property Law - 9600 S.W. Oak Street · Suite 500 · Tigard, Oregon 97223
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