The PCB must be mounted floated, otherwise key presses don't work reliable. Connect pins 3 and 4 on connector P1 for 16-pin button mode. Smaller keypads with less pins may work, but are not tested.

Strictly speaking, a Theremin uses a pair of antennae that act as capacitors in a specific R/C circuit. Looking at [aritrakdebnath2003]’s MIDI THEREMIN, we see it works differently, but it does play ...

A standard telephone keypad, with four rows of three keys each. The top row consists of 1, 2, and 3, with keys continuing down in order until the last row, which is usually *, 0, and #. Such a keypad ...

净值估算数据按照基金历史披露持仓和指数走势估算，不构成投资建议，仅供参考，实际以基金公司披露净值为准。 净值估算是按照基金历史定期报告公布的持仓和指数走势预测当天净值。预估数值不代表真实净值，仅供参考，实际涨跌幅以基金净值为准。