Raspberry Pi Pico வை பயன்படுத்தி 4×3 Matrix Keypad Module ஐ கட்டுப்படுத்துவது
Required Components
4×3 Matrix Keypad-1 no
Raspberry Pi Pico board-1 no
Data Cable-1 no
Connecting Wires-8 no
Circuit
Steps
நாம் பயன்படுத்தும் உபகரணங்கள் சரியாக வேலை செய்கிறதா என்பதை உறுதி செய்து கொள்ளவும்.
4×3 Matrix keypad 1 முதல் 7 வரை உள்ள பின்களை Raspberry Pi Pico GP1 முதல் GP7 வரை உள்ள பின்களுடன் இணைக்க வேண்டும்.
Python program ஐ சரி பார்க்க வேண்டும்.
மின்சுற்றை சரி பார்க்க வேண்டும்.
Python program ஐ ரன் செய்ய வேண்டும்.
Python Program
from machine import Pin
import utime
# define PINs according to cabling
# following array matches 1,2,3 PINs from 3x4 Keypad Matrix
col_list=[1,2,3]
# following array matches 4,5,6,7 PINs from 3x4 Keypad Matrix
row_list=[4,5,6,7]
# set row pins to output and change array elements from
# int to Pin objects, all set to high
for x in range(0,4):
row_list[x]=Pin(row_list[x], Pin.OUT)
row_list[x].value(1)
# set columns pins to input and change array elements
# from int to Pin objects. We'll read user input here
for x in range(0,3):
col_list[x] = Pin(col_list[x], Pin.IN, Pin.PULL_UP)
# Create a map between keypad buttons and chars
key_map=[["#","0","*"],\
["9","8","7"],\
["6","5","4"],\
["3","2","1"]]
def Keypad3x4Read(cols,rows):
for r in rows:
r.value(0)
result=[cols[0].value(),cols[1].value(),cols[2].value()]
if min(result)==0:
key=key_map[int(rows.index(r))][int(result.index(0))]
r.value(1) # manages key keept pressed
return(key)
r.value(1)
# Start the main loop
print("--- Ready to get user inputs ---")
while True:
key=Keypad3x4Read(col_list, row_list)
if key != None:
print("You pressed: "+key)
utime.sleep(0.3) # gives user enoght time to release without having double inputs
To control 4×3 Matrix Keypad Module using Raspberry Pi Pico
Required Components
4×3 Matrix Keypad_1 no
Raspberry Pi Pico board_1 no
Data Cable_1 no
Connecting Wires_8 no
Circuit
Steps
Make sure the components are working properly.
4×3 Matrix keypad 1 to 7 pins connected to GP1 to GP7 of Raspberry Pi Pico Board respectively.
Check the Python program.
Check the Electrical Circuit.
Run the Python program.
Python Program
from machine import Pin
import utime
# define PINs according to cabling
# following array matches 1,2,3 PINs from 3x4 Keypad Matrix
col_list=[1,2,3]
# following array matches 4,5,6,7 PINs from 3x4 Keypad Matrix
row_list=[4,5,6,7]
# set row pins to output and change array elements from
# int to Pin objects, all set to high
for x in range(0,4):
row_list[x]=Pin(row_list[x], Pin.OUT)
row_list[x].value(1)
# set columns pins to input and change array elements
# from int to Pin objects. We'll read user input here
for x in range(0,3):
col_list[x] = Pin(col_list[x], Pin.IN, Pin.PULL_UP)
# Create a map between keypad buttons and chars
key_map=[["#","0","*"],\
["9","8","7"],\
["6","5","4"],\
["3","2","1"]]
def Keypad3x4Read(cols,rows):
for r in rows:
r.value(0)
result=[cols[0].value(),cols[1].value(),cols[2].value()]
if min(result)==0:
key=key_map[int(rows.index(r))][int(result.index(0))]
r.value(1) # manages key keept pressed
return(key)
r.value(1)
# Start the main loop
print("--- Ready to get user inputs ---")
while True:
key=Keypad3x4Read(col_list, row_list)
if key != None:
print("You pressed: "+key)
utime.sleep(0.3) # gives user enoght time to release without having double inputs
