GPIO python examples

Project configuration 
 Give access to gpio 
 chmod 777 -R /sys/class/gpio
 
 Install prerequisite packages 
 apt-get install python3-venv
 
 Create new python environment 
 mkdir pin_blink
cd pin_blink
python3 -m venv
source bin/activate
 
 Install required library called gpio 
 python3 -m pip install gpio
 
 1. Blink led 
 import time
import gpio
GPIO_PINS = {
 "GPIO1_B1": 41,
 "GPIO4_C3": 147,
 "GPIO0_A0": 0,
 "GPIO0_B7": 15,
 "GPIO0_C4": 20,
 "GPIO0_C7": 23,
 "GPIO1_B2": 42
}
# GPIO pin number
pin = GPIO_PINS['GPIO1_B1']
blink_time = 0.5

# Set pin as output
pin_obj = gpio.GPIOPin(pin, gpio.OUT)

# Blink LED
while True:
 pin_obj.write(gpio.HIGH)
 time.sleep(blink_time)
 pin_obj.write(gpio.LOW)
 time.sleep(blink_time)
 
 2. Read button state 
 import time
import gpio

GPIO_PINS = {
 "GPIO0_A6": 6,
 "GPIO1_B1": 41,
 "GPIO4_C3": 147,
 "GPIO0_A0": 0,
 "GPIO0_B7": 15,
 "GPIO0_C4": 20,
 "GPIO0_C7": 23,
 "GPIO1_B2": 42
}
# GPIO pin number
pin = GPIO_PINS['GPIO0_A6']
polling_time = 0.5

# Set pin as input
pin_obj = gpio.GPIOPin(pin, gpio.IN)
last_state = pin_obj.read()

while True:
 current_state = pin_obj.read()
 if(current_state != last_state):
 last_state = current_state
 print("State changed to: " + str(current_state))
 time.sleep(polling_time)