Powering a Trinket M0

Using Arduino General Electronics
1

I have a small project and a question about power supplies.
The project consists of:
One AdaFruit Trinket M0 (3V3 power) - Overview | Adafruit Trinket M0 | Adafruit Learning System

Two inductive prox switches (10-30V supply), NPN out - https://www.amazon.com/dp/B08K8VF6G7?psc=1&ref=ppx_yo2ov_dt_b_product_details

One piezo buzzer – came with Elegoo kit. Verified operation at 3.3 volts.

Two Trinket built-in LEDs I’ll be using for indicators. One is an RGB DotStar.

Mount/connect all via stripboard. Not wedded to it.

I’m planning a 12V wall wart to power the proximity switches. Adafruit shows 6V as Bat maximum so I can’t run +12V directly to the Trinket.

Present possibilities:

a. a separate wall wart at 5V for the Trinket. Meh.

b. Construct a regulator on (the planned) strip board – components would need to be ordered.

c. Add a modular regulator a la Sparkfun SparkFun Buck Regulator Breakout - 3.3V (AP63203) - COM-18356 - SparkFun Electronics

d. I have on hand a breadboard add-on regulator Breadboard Power Supply Module MB102 3.3V 5V Solderless Breadboard Voltage Regulator – SRS™
which, although I’ve been told to leave in the box it came in, I thought I might use by soldering it onto the stripboard.

Any recommendations?

2

Sounds good.

A linear regulator would do, too.
Personally, I'd just get a generic 5V phone charger and regulate it's output down to 3.3v and call it good. If the Trinket's onboard regulator suffices for the task, so much the better.

3

Thanks!

I'm starting to lean that way. I have a free pin so I'll test adding a voltage divider output from the 12V supply so the 12V can be monitored.

4

Yeah, you can easily do that. Shouldn't be a problem as long as the input pin is hooked up internally to the ADC.

5

Trinket does not have a 3.3V input

6

Yes. I'm still getting my feet wet with this board.