This document discusses controlling GPIO pins on the Raspberry Pi 3. It covers 5 GPIO functions including GPIO.setmode() and GPIO.setup(). An example program is provided to read input from a button and print output. The task is then presented to write a program that turns on an LED when a button is pushed. The solution program uses GPIO.input() to read the button and GPIO.output() to control the LED based on the button state. Finally, upcoming project demos on the Raspberry Pi are listed including using a buzzer, motion sensor, and camera.

1. Shahed Mehbub
President, Robo Mechatronics Association Bangladesh(RMABD)
Day 3

2. Raspberry Pi 3 GPIO

3. 5 functions to control GPIO’s
• GPIO.setmode()
• GPIO.setwarnings()
• GPIO.setup()
• GPIO.input()
• GPIO.output()

4. Button input - Wiring

5. Performing GPIO Input
#import RPi.GPIO as GPIO
From EmulatorGUI import GPIO
import time
GPIO.setmode(GPIO.BCM)
INPUTPIN= 23
GPIO.setup(INPUTPIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
while True:
if(GPIO.input(INPUTPIN) == True):
print(‘this’)
else:
print(‘that’)

6. Your Task!!
Write a program that pushing a button
will turn on an LED

7. Solution
From EmulatorGUI import GPIO
import time
GPIO.setmode(GPIO.BCM)
INPUTPIN= 23
led = 4
GPIO.setup(INPUTPIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
while True:
if(GPIO.input(INPUTPIN) == True):
led.on()
else:
led.off()
def led_on():
GPIO.output(led, True)
Def led_of():
GPIO.output(led, False)

8. Project Demo on Raspberry Pi
• Buzzer output
• PIR Motion Sensor
• Camera Interfacing

9. Questions???

10. This slide is available at
http://bit.ly/raspberrypi-workshop-day3