My goal is to save energy, and I intend to do so by powering a chip with itself, and cut power whenever unnecessary. The best image I can have is of a startled monkey who jumps on the branch, screams its profanities while holding to the branch, and when the screams are done, lets go of the branch and falls back on the floor, asleep.
The chip, in my case an ATtiny45, has a program that just makes a specific sound (hopefully more pleasing than an angry monkey's) with a PWM, but would also power an output pin connecting to a transistor acting as a relay between the battery and the power pin.
This is the ideal protocol:
(No closed circuit, no power) Press Button Battery power goes through to transistor Transistor allows current from Battery to PWR pin Software: Chip starts PWM to Speaker and Outputs constantly the Hold Pin Hold pin powers the transistor and thus the chip for when the button won't be pressed Software: When Button still pressed, makes Chip Scream louder Software: Button not pressed anymore makes chip scream softer until it's done screaming Software: Scream is finished, stops powering the Hold Pin Transistor isn't powering the chip anymore.
I think the idea is plausible, though I can't test it at the moment due to not having NPN transistors (?)
My questions are the following:
- Truth: Is is possible for a transistor as relay to power a chip on demand?
- Risks: Is the power going to be stronger due to the amplifying nature of the transistor? What about the chip, I've read that a chip can maintain its code for 20+ years without power supply. Is this true?
- Goals: Is there a better way to save power? Would it be best for the chip to just have sleep enabled?
- Name: If this works, is there a better name than the Startled Monkey?
Thanks again for your help, this community has already taught me a lot!