Need some help assembling a roller blinds automation project

[Bezzero]

@LarryD

If you try to take more than 20mA from an Arduino pin (example your 150mA) you will destroy your Arduino.

Why is that? Everywhere I've read online states it can output 133mA and can certainly turn on relays.

@LarryD

You can time events with the Arduino, however, this is not the same as counting turns.

But I do know how long a single turn takes, and how many turns it takes for the blinds to go from top to bottom.

With your suggestion; using transistors, relays and limit switches, Is an Arduino needed?

Thanks