Sometimes you need to directly program your microcontroller, or you want to convert TTL signal to USB interface which is a USB Serial Port to CMOS Logic-Level Serial Port or you want to convert 5V microcontroller signals to exact 3.3V signal without putting any extra effort, you can do all these sorts of thing with these component mentioned in this category. You will find everything like, AVR USBASP Programmer, CP2102 USB to TTL USB UART Serial Converter Module, ESP-01 ESP8266 Adapter Programmer, FT232RL USB to UART TTL Serial Adapter Module, ST-link V2 Programmer for STM8 and STM32 etc here.

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