1. Passive Infrared Sensor
The PIR Sensor detects motion
Copyright (c) 2017 by Dr. E. Horvath

2. Passive Infrared Sensor
Copyright (c) 2017 by Dr. E. Horvath

3. Copyright (c) 2017 by Dr. E. Horvath
PIR Sensor Circuit
Leads left to right on the back of the PIR Sensor
Breadboard locations
GND VCC OUT
j1 j2 j3
breadboard location f2 jumper wire to 3.3 V PWR (Pin 1)
breadboard location f3 jumper wire to GPIO 17 (Pin 11)
breadboard location f1 jumper wire to GND (Pin 6).
Connect the GND last.
Remove the GND first, when taking the circuit apart.
Copyright (c) 2017 by Dr. E. Horvath

4. Copyright (c) 2017 by Dr. E. Horvath
PIR Sensor Circuit
Copyright (c) 2017 by Dr. E. Horvath

5. Passive Infrared Sensor
from time import sleep
import RPi.GPIO as GPIO
Import the GPIO library to interact with the GPIO
GPIO.setmode(GPIO.BCM)
Set to the Broadcom mode to access the pins by the functions
PIR = 17
Monitor GPIO 17
GPIO.setup(PIR, GPIO.IN)
try:
while True:
print("Waiting...")
sleep(0.1) # Do not use up CPU cycles

6. Passive Infrared Sensor
if GPIO.input(PIR) == 1:
print("PIR detected")
sleep(1)
else:
print("Waiting for passive infrared sensor")
sleep(0.1)
except KeyboardInterrupt:
print(“Exiting ...”)
finally:
GPIO.cleanup()
Set the pins back to a safe state

7. Copyright (c) 2017 by Dr. E. Horvath
Sending s
import smtplib
from .mime.text import MIMEText
fromaddr = 'Your address'
toaddr = 'Reciever address'
username = 'Your address'
password = 'Your password'
Copyright (c) 2017 by Dr. E. Horvath

8. Copyright (c) 2017 by Dr. E. Horvath
Sending s
Create a gmail account
Go to
Access for less secure apps Turn on
Copyright (c) 2017 by Dr. E. Horvath

9. Copyright (c) 2017 by Dr. E. Horvath
Sending s
msg = MIMEText('This Raspberry PI stuff is awesome')
msg['Subject']='PYTHON WITH RASPBERRY PI ANOTHER TEST'
msg['From'] = fromaddr
msg['To'] = toaddr
server = smtplib.SMTP('smtp.gmail.com:587')
server.ehlo()
server.starttls()
server.login(username,password)
server.send_message(msg)
server.quit())
Copyright (c) 2017 by Dr. E. Horvath

10. LEDs Color Maximum Voltage (check datasheets) Red 2V
Green/Yellow/Orange 2.2V
Blue/White 3.7V
Violet 4V
Ultraviolet 4.4V
Infrared 1.6V

11. Copyright (c) 2017 by Dr. E. Horvath
Ohm's Law
V = IR
Voltage = Current * Resistance
Current – measured in Ampheres
Use mA in the lab
1000mA = 1A
1mA = 0.001A
Resistance – measured in Ohms
Copyright (c) 2017 by Dr. E. Horvath

12. Copyright (c) 2017 by Dr. E. Horvath
Ohm's Law
Maximum current on any GPIO pin 16mA
Output from a GPIO pin is 3.3 V
3.3V – 2.2V = 1.1V
2.2V to power the green LED
V = IR
1.1V = 16 * * R
R = 1.1/(16 *0.001) = Ohms for maximum brightness
The minimum you should use is 100 Ohms
Use higher resistance over 1KOhm when experimenting
Copyright (c) 2017 by Dr. E. Horvath

13. Copyright (c) 2017 by Dr. E. Horvath
Compute the Current
I = V/R
I = 1.1/R
R is your resistor's value in Ohms
Refer to the color chart
Copyright (c) 2017 by Dr. E. Horvath

14. Copyright (c) 2017 by Dr. E. Horvath
Resistor Color Chart
Copyright (c) 2017 by Dr. E. Horvath

15. Four Band Resistor Code
Bands 1 and 2
First Digit and Second Digit
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Purple 7
Gray 8
White 9
Band 3
Multiplier or Number of Zeroes
Black * 1
Brown * 10
Red * 100
Orange * 1,000
Yellow * 10,000
Green * 100,000
Blue * 1000,000
Purple * 10,000,000
Gray * 100,000,000
White * 1,000,000,000
Gold *0.1
Silver * 0.01
Copyright (c) 2017 by Dr. E. Horvath

16. Four Band Resistor Code
Band 4 Percent Tolerance
Black -
Brown 1%
Red 2%
Orange -
Yellow
Green %
Blue %
Purple %
White -
Gray
Gold %
Silver %
No color 20%
Copyright (c) 2017 by Dr. E. Horvath

17. Copyright (c) 2017 by Dr. E. Horvath
Connecting an LED
Light emitting diode (LED) connections
Longer lead is positive (anode) breadboard location j24
Shorter lead is negative (cathode) breadboard location j22
470 Ohm Resistor
breadboard location i30
breadboard location i24
breadboard location h30 jumper wire to GPIO 22 (Pin 15)
breadboard location f22 jumper wire to GND (Pin 9)
Copyright (c) 2017 by Dr. E. Horvath

18. Copyright (c) 2017 by Dr. E. Horvath
Connecting an LED
Copyright (c) 2017 by Dr. E. Horvath

19. Copyright (c) 2017 by Dr. E. Horvath
Turning on an LED
import RPi.GPIO as GPIO
green_led = 23
GPIO 23
GPIO.setup(green_led,GPIO.OUT)
Set the pin to be an output
GPIO.output(pin_number,True)
Turn on the LED
sleep(interval)
GPIO.output(pin_number,False)
Turn off the LED
GPIO.cleanup()
Set the GPIOs back to a safe state
Copyright (c) 2017 by Dr. E. Horvath