What's the difference between tc35t tc35i? Please specify. What is the most suitable gsm short message transceiver module controlled by single chip microcomputer? It just needs text messages.

The main difference between TC35 and TC35i is that the latter is made of environmentally friendly materials, and the power supply voltage range is different. Of course, TC35i is a little more expensive. If you just send short messages, you can use TC35, which has a wider range of power supply voltage and is more convenient to use with a single chip microcomputer that needs a 5V power supply. In the design process, it is best to refer to the online power supply design, because these GSM modules have higher requirements for power supply, and also look at their data tables, pay attention to the pins and functions, and don't get confused. It's all for simplicity. If you don't know anything, ask again.