from machine import Pin, I2C
import ssd1306
import utime

# ESP32 Pin assignment 
i2c = I2C(0, scl=Pin(9), sda=Pin(8))

oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)

oled.text('Hello, Wokwi!', 10, 10)      
oled.show()


print("Hello, ESP32-S3!")



keyMatrix = [
    [ "F1",  "F2",   "F3"],
    [ "Left",    "Up",   "F4"],
    [ "Down",    "*",   "Right"]
]
colPins = [7,15,16]
rowPins = [6,5,4]

row = []
column = []

for item in rowPins:
    row.append(machine.Pin(item,machine.Pin.OUT))
for item in colPins:
    column.append(machine.Pin(item,machine.Pin.IN,machine.Pin.PULL_DOWN))
key = '0'
def scanKeypad():
    global key
    for rowKey in range(5):
        row[rowKey].value(1)
        for colKey in range(4):
            if column[colKey].value() == 1:
                key = keyMatrix[rowKey][colKey]
                row[rowKey].value(0)
                return(key)
        row[rowKey].value(0)
def printKey():
    key=scanKeypad()
    if key is not None:
        print("Key pressed is:{}".format(key))
    utime.sleep(0.2)
    
while True:
    printKey()