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1 from machine import Pin
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2 class Keys:
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3 def __init__(self):
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4
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5 self.rows = [
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6 Pin(23, Pin.OUT),
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7 Pin(22, Pin.OUT),
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8 ]
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9 self.cols = [
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10 Pin(36, Pin.IN, pull=-1), # these don't have internal pullups
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11 Pin(39, Pin.IN, pull=-1),
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12 Pin(34, Pin.IN, pull=-1),
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13 Pin(35, Pin.IN, pull=-1)
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14 ]
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15 self.prev = ''
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16
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17 def newKeysDown(self):
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18 res = ''
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19 for r, rp in enumerate(self.rows):
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20 rp.value(0)
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21 for c, cp in enumerate(self.cols):
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22 res += str(1 - cp())
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23 rp.value(1)
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24 if res != self.prev:
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25 self.prev = res
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26 return res |
