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)