Joke Collection Website - Public benefit messages - S900a can send information through serial port, but not through single chip microcomputer.

S900a can send information through serial port, but not through single chip microcomputer.

When sending Chinese short messages, Chinese characters are converted into Unicode numbers.

When sending Chinese short messages, every four digits of Chinese characters converted into Unicode should be deleted, including Chinese characters and telephone transcoding. You can send the number without adding 86. If not, add more. Power supply is very important for SIM900A. USB-TTL module of CP2 102 is recommended for serial port.