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Microduino-USBTTLC module, is a switching chip based on CH340 USB bus, and it can be directly connected with mCookie-Core , mCookie-Core+ or mCookie-CoreRF, to make them communicate with the computer, to download programs and debug serial ports.
When downloading programs, you can use it and it can be reused.
When debugging programs, you can directly use MicroUSB to supply power.
To learn more about the Microduino-USBTTLC specification, visit Microdino-USBTTLC Wiki page.