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keypad.py
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keypad.py
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import time, random, RPi.GPIO as GPIO
from datetime import datetime
# 0 5 6 13 19 26 21
ROW = [5,21,26,13] # Inputs as below
COLUMN = [6,0,19] # Outputs - set to zero
MAPPING = {(0, 0): '1', (0, 1): '2', (0, 2): '3',
(1, 0): '4', (1, 1): '5', (1, 2): '6',
(2, 0): '7', (2, 1): '8', (2, 2): '9',
(3, 0): 'clear', (3, 1): '0', (3, 2): '.',
}
class Keypad:
def __init__(self):
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
for c in COLUMN:
GPIO.setup(c, GPIO.IN, pull_up_down=GPIO.PUD_UP)
for r in ROW:
GPIO.setup(r, GPIO.OUT)
GPIO.output(r, 1)
self.last_time_called = datetime.now()
def all_rows_on(self):
for r in ROW:
GPIO.output(r, 1)
def scan(self, now):
if (now - self.last_time_called).total_seconds() < 1:
return False
#which key has been pressed
#run loop over each column, set the one I'm on to zero and the other two to 1
#check to see if row input is zero or one
for r in ROW:
self.all_rows_on()
GPIO.output(r, 0)
time.sleep(0.0001)
for c in COLUMN:
if not GPIO.input(c):
self.last_time_called = now
return MAPPING[(ROW.index(r), COLUMN.index(c))]
return False