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This is a USB–TTL converter based on a CH340G USB to Serial TTL converter chip. The module can be used for 3.3V logic level signals and has the option to switch from 5V to 3.3V logic level using a 2-pin shunt supplied with the module. It includes a small switch that allows the voltage available at the Voltage output pin to be switched between 3.3 and 5V. It has TX and RX Pins. These digital pins are compatible at 5V TTL levels allowing them to be directly interfaced with most 5V microcontrollers.

This converter module has a CH340G chip. It is compatible and supported with most Windows systems. Since the CH340G driver IC is available onboard, it is easy to use with a computer or laptop and Program Arduino or other controller board that supports COM Port Programming interfaces.

Specifications:

Working voltage: 3.3V – 5.5V (Onboard 3.3v LDO Regulator)
Working current: 200mA (LDO regulator can supply).
CH340 Serial Converter
Supports all basic windows versions - WIN7/VISTA/MAC/LINUX(32 bit /64-bit system

ESP8266 Adapter Programmer Applications: