#padlock system
#code is generated using input from real world - temp sensor, humidity sensor and light sensor
## imports
from machine import Pin, I2C, ADC
import ssd1306
import time
from math import log
from dht import DHT22
#oled display
i2c = I2C(0, sda=Pin(4), scl=Pin(5))
display = ssd1306.SSD1306_I2C(128, 64, i2c)
#keypad
mkeys= [['A', '3', '2', '1'],
['B', '6', '5', '4'],
['C', '9', '8', '7'],
['D', '#', '0', '*']]
rows = [13, 12, 11, 10]
columns = [6, 7, 8, 9]
rpins = [Pin(13, Pin.OUT), Pin(12, Pin.OUT), Pin(11, Pin.OUT), Pin(10, Pin.OUT)]
cpins = [Pin(6, Pin.IN, Pin.PULL_DOWN), Pin(7, Pin.IN, Pin.PULL_DOWN), Pin(8, Pin.IN, Pin.PULL_DOWN), Pin(9, Pin.IN, Pin.PULL_DOWN)]
for i in range(4):
rpins[i].value(1)
cpins[i].value(0)
#thermistor
temp = ADC(28)
b = 3950
kc = 273.15
#photoresistor
photo = ADC(27)
#humidity sensor
humid = DHT22(Pin(26))
#code variables
timer = 0
strikes = 0
string = ""
strikelog = 0
#default screen
display.text("enter code", 0, 0, 1)
display.text("to unlock!", 0, 25, 1)
display.show()
while True:
if timer % 12000 == 0: #collect data to create code
tempval = temp.read_u16()
cels = (1/(log(1/(65535/tempval - 1))/b + 1/298.15) - kc)
lux = photo.read_u16()
humid.measure()
h = humid.humidity()
code = int(h *lux // cels) % 10000
while len(str(code)) < 4: #standardises length
code = "0" + str(code)
for i in range(4): #rows
for j in range(4): #columns
rpins[i].high()
key = None
if cpins[j].value() == 1:
string += mkeys[i][j]
display.fill(0)
display.text(string, 0, 0, 1)
display.show()
kpress = mkeys[i][j]
rpins[i].low()
if string == str(code): #verification of code
display.fill(0)
display.text("unlocked", 0, 0, 1)
display.text("welcome!", 0, 50, 1)
display.show()
strikes = 0
strikelog = 0
else:
if string == "****": #developer code - reveals code
display.fill(0)
display.text(str(code), 0, 0, 1)
display.show()
string = ""
elif len(string) == 4 and string != str(code): #adds strike, returns string to nothing
strikes += 1
string = ""
if strikes == 3: #strike system
if strikelog == 0:
sleepy = 40
elif strikelog > 0:
sleepy = 40 + 40*strikelog
display.fill(0)
display.text("wait " + str(sleepy) + " seconds", 0, 0, 1)
display.text("3 strikes,", 0, 25, 1)
display.text("you're out!", 0, 50, 1)
display.show()
time.sleep(1)
while sleepy > 0: #displays seconds remaining
sleepy -= 1
display.fill(0)
display.text("wait " + str(sleepy) + " seconds", 0, 0, 1)
display.text("3 strikes,", 0, 25, 1)
display.text("you're out!", 0, 50, 1)
display.show()
time.sleep(1)
strikes = 0
strikelog += 1
display.fill(0)
display.show()
time.sleep(0.1)
timer += 1 #time system
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