Linear magnetic axis keyboard - Hanmei

        The name "Hanmei" (寒梅, meaning "Winter Plum") comes from the Chinese proverb "The fragrance of plum blossoms comes from the bitter cold." This is a low-cost linear magnetic keyboard designed using the AT32F425K8T7 microcontroller in an LQFP32 package, paired with a low-cost linear Hall effect sensor 49E. The design precision is 0.5mm. The schematic is a 6x18 matrix (actual maximum 6x15), which can be modified to layouts of 98 keys or less (maximum 108 keys; making a 104-key layout requires moving many unused keys, which is cumbersome; layouts of 98 keys or less are only recommended). A 61-key binary firmware is also provided for DIY projects.
        The communication protocol is a custom OpenAgreementHID (OHID) protocol, which will be updated periodically. The attached OHID protocol document can be used to write your own host computer.
        Note: The prototype uses a front-mounted iridescent package; you can modify it to a reverse-mounted package.
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