Digital Input to turn on led.

Hello Folks…

It’s been a while ever since I have done the first GPIO test on my Raspberry Pi 2. Now it’s the time to proceed with this again. Raspberry Pi 2 with linux-based operating system has made me scratch my head initially. Thanks god ! I have found many resources which I can learn the python script with a quick manner. 

As I have learned and familiarized with Arduino IDE, the basic grasp of Arduino’s code helped me to progress too.

In this part, I would like to share the some of the details of using digital pins in Raspberry Pi 2.

The components used are:

1. Raspberry Pi 2

2. A red LED

3. 220-ohm resistor

4.Jumper wires

5.Momentarily push button.

6.10k-ohms resistor

Let’s setup the circuit which I had drawn by using Fritzing:

In the script:

When I pressed on the button momentarily, it will turn on; meanwhile it will turn off after the button is not pressed. 

import RPi.GPIO as GPIO

import time

GPIO.setwarnings(False)

GPIO.setmode(GPIO.BCM)

GPIO.setup(26, GPIO.OUT)

GPIO.setup(16, GPIO.IN)

while True:

        readButton = GPIO.input(26)

        if readButton == True:

                GPIO.output(26, 1)

                time.sleep(0.01)

        else if readButton == False:

                GPIO.output(26, 0)

                time.sleep(0.01)

How about a latching switch?

import RPi.GPIO as GPIO

import time

GPIO.setwarnings(False)

GPIO.setmodel(GPIO.BCM)

GPIO.setup(26, GPIO.OUT)

GPIO.setup(16, GPIO.IN)

while True:

        val == GPIO.input(16)

        if val == True and oldval == False:

                state = not state

                time.sleep(0.001)

                oldval = val

        if state == 1:

                GPIO.output(26, 1)

                Print’ON’

        else:

                GPIO.output(26, 0)

                Print’OFF’

               

That’s all ? 

Stay tune in my next blog.

Bye !