We help you turn old android phones into robot brains if that's your thing. No bluetooth needed, we use the audio jack as a serial port. https://robots-everywhe

We help you turn old android phones into robot brains if that's your thing. No bluetooth needed, we use the audio jack as a serial port. https://robots-everywhere.com/ https://robots-everywhere.com/ (all designs are free on the wiki, or you can buy it)