Asprogrammer+21013 [2021] -

The original CH341A outputs 5V on its I/O pins. Many CH21013 variants fix this with level shifters, but always verify your board. Feeding 5V to a 3.3V Winbond chip is a quick way to let the magic smoke out.

One of the biggest points of confusion in forums is the term asprogrammer+21013

ASProgrammer+ 21013 unlocks specific hardware modes of the CH341A chipset: The original CH341A outputs 5V on its I/O pins

Title: Ship Small, Iterate Fast — Part 1: Design a Minimal, Testable Service Blurb: In this post I’ll design a tiny REST service, write a test suite first, and show how small, test-driven iterations catch design flaws early. write a test suite first