Description of CH340 USB to Serial Converter 3V3 to 5V CH340 based USB to Serial Converter. For using with microcontrollers and other devices with serial interface (TX,RX). Thers's a 3V3-5V toggle switch which enables it to be used with both 5V and 3.3V devices. Windows driver: Download from here. You might have to disable "driver signature enforcement" on windows first before installing the driver. To do that - Step-1: Start>Update & security>Recovery>Restart now Step-2: Troubleshoot>Advanced options>Startup Settings>Restart Step-3: After Windows restarts 7) Disable driver signature enforcement Step-4: Press F7 to disable driver Signature enforcement
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