adafruit_support wrote:There are a lot of ways to approach it. I'd recommend reading through the "Process" page in the MintyBoost tutorial first. Even if you don't plan to build the Minty yourself, there is a lot of great insight into Ladyada's engineering process, starting with her evaluation of alternative approaches to the problem.
email@example.com wrote:What you want is a device called a 'voltage detector' or 'voltage monitor'. Here's a datasheet for an example:
You can build an equivalent circuit yourself if you want the challenge (Google "low battery circuit"), or use an IC if you want to save time and board space.
Looking through some example circuits will give you a general idea of how the thing works though.. the basic idea is to use a mosfet as a 'power switch' between the rest of your circuit and the battery, and then use the voltage detector to 'flip the switch', as it were.
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