KEY MATRIX 4x4

Specification

What		Comments
Identifier	KEY_MATRIX_4_4
Interface	8 GPIO	GPIO 1: L1 L2 L3 L4 H1 H2 H3 H4 Lx: columns Hx: rows
Provides	key1 key2 key3 key4 key5 key6 key7 key8 key9 key10 key11 key12 key13 key14 key15 key16	1 = key down 0 = key up
Properties	none
Callbacks?	yes

Code

-- Attach switch to GPIO26
s = sensor.attach("PUSH_SWITCH", pio.GPIO26)

-- Register a callback. Callback is executed when some sensor property changes.
s:callback(
   function(data)
      if (data.on == 1) then
         print("on")
      elseif (data.on == 0) then
         print("off")
      end
   end
)