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Bob writes in with a rundown on how to repurpose an old USB cellphone data cable for rs232 communication.

About three years ago,I bought a USB data cable to use with T610 mobile phone.I can’t remember what is model just know it is made in China.But now I have a new model mobile phone and my USB data cable not used at all.So I want to modify it to use with my microcontroller projects that use rs232 communication like a USB to RS232 converter.If you have this cable and want to modify this article may help you.

Old cellphones are great for scavenging µC project parts like small LCDs, motors, etc. –Link

Related:

RS-232 to USB conversion – Link

From the Maker store:

USB-TTL Serial Cable –Link