the oldest implement ttl level asynchronous serial by means of "custom" usb data cable, which is just proprietary connector on one end, other usb-to-serial converter (almost always prolific pl2303) between them. Modern (<10 year old) phones have standard gsm chip interface implemented and accessible via so-called "data port". I will also present simple terminal emulator sketch – to use the code you will need an Arduino board, USB Host Shield, as well as USB Host Shield 2.0 library. In this post, I will be talking about basics of cell phone control using data port and AT commands. All that makes a cell phone an attractive communication option for hobby projects. Also, m2m (machine to machine) SIM cards start at $4-$6/mo, some even allow for free incoming SMS. Second hand phones are inexpensive yet quite capable. ![]() One of the main motivations for adding asynchronous CDC support code to rev.2.0 of USB Host Library was to be able to use cell phones in Arduino projects – establish simple data exchange via SMS, take pictures or connect to the Internet.
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