This is an alternative product to my original design here: https://www.tindie.com/products/21096/

If you need to turn ON or OFF the converter with an MCU like arduino, esp32 etc you can simply connect your digital or analog pin to the EN pin on the converter and as soon as you apply HIGH(1) signal from your mcu, converter will turn ON and when you pull it down LOW(0) it will turn OFF. Works with both 5V or 3.3V logic levels and it doesnt need any in line resistor because theres already a 20K resistor on the board to protect your MCU pin. Also when you turn off your MCU, converter will turn OFF too because theres a pull down resistor on board. If you ever need to convert it to a stand alone version in a way that it can work without MCU, you can simply remove 'R2' resistor and it will turn on as soon as theres a voltage on the 'IN' side.

Description from my original design which also applies to this product:

DC DC step down converter from 8-60V DC max to 5V DC 3.5Amps

I designed it because I needed some small and slim power converter supporting high voltage but at the same time outputting at least 3Amps. Most of the converters either lack voltage or amps requirement or they are too big.

It’s size is only 38x20x4.3(mm)

I personally use it to power my microcontroller along with bunch of accessories, 5V fan and ws2812b led strip. Output voltage can be changed to let’s say 12V but it requires you to replace 0603 resistors.