What is the use of type-c to ttl module?

The function of USB to TTL module is to convert the level into a level that can be recognized by both parties for communication.

USB is a kind of serial port (serial port is a big kind of interface, including but not limited to RS232). It has a complex communication protocol, supports hot plug, and can transmit data at a very fast speed. Serial port refers to RS232 serial port, which is a transmission interface with almost no protocol and can directly send and receive data.

TTL refers to the level of transistor logic circuit. TTL and RS232 differ only in signal level, and there is no other difference. USB is also TTL level, but 5 1 single chip microcomputer does not integrate USB controller, so it does not support downloading USB directly, and because USB protocol is very complicated, 5 1 single chip microcomputer software is generally not used to simulate USB.