Arduino: testing ‘brown-out’ on ATtiny85

Following on from getting an Arduino programme to run on an 8pin ATtiny (ATtiny85), I need to invoke the in-built brown-out reset circuit – because my application involves running from an intermittently-charged super-capacitor across the supply rails, creating a slowly-varying supply voltage. If brown-out reset is not invoked (detector ‘off’ is the default), then the chip may ...

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from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/arduino-testing-brown-attiny85-2017-08/