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Keyboard matrix circuit
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<p>A keyboard matrix circuit is a design used in most electronic <a href="/facts/Musical_keyboard/Mz0FGAe4">musical keyboards</a> and <a href="/facts/Computer_keyboard/MczF9LIS">computer keyboards</a> in which the key switches are connected by a grid of wires, similar to a <a href="/facts/Diode_matrix/3MPPVB8s">diode matrix</a>. For example, 16 wires arranged in 8 rows and 8 columns can connect 64 keys—sufficient for a full five octaves of range (61 notes). By scanning these crossings, a keyboard controller can determine which keys are currently pressed. </p>