Use of CR2032 + smol Power Board?

Components & Accessories Power
1

Hi there,

I purchased some smol products and have been quite pleased so far, however I have a question related to the power boards (I have both).

One of my projects (a data logger) runs on a CR2032 battery, can I use the smol Lipo or AAA with it? Will these play nice? I’m assuming there might be a problem with the charger on the Lipo board?

2nd question; do I need to pair the power board with another microcontroller? Could I have the ATtiny wake up, grab readings from a sensor, log it, and go back to sleep? Or is there a flaw in my thinking here?

Thanks in advance for the help!

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  1. The AAA outputs 3.3v, Lipo will output 4.2v…both are higher than the 3v a CR2032 needs (you’ll be overvolting the system) - you COULD use these, but you’d need to stepdown the voltage from it/them down to 3v (voltage divider, or stepdown converter are a couple options)

  2. You are thinking correctly; no 2nd MCU needed (the ATtiny is one)

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TS-Russell:

  1. The AAA outputs 3.3v, Lipo will output 4.2v…both are higher than the 3v a CR2032 needs (you’ll be overvolting the system) - you COULD use these, but you’d need to stepdown the voltage from it/them down to 3v (voltage divider, or stepdown converter are a couple options)

  2. You are thinking correctly; no 2nd MCU needed (the ATtiny is one)

I think Lipo is totally out of the question since it’s overvolting even when depleted, as you mentioned. Isn’t AAA 1.5V, boosted to 3.3V by the board? Meaning the CR2032 (3V) would be fine as it would be boosted to 3.3V? That’s what the specs say, anyway.

In terms of programming the ATtiny on the board, it looks like it requires an external processor board? How would I go about programming it?