Internet of Things Practical Notes | B.Sc. (Information Technology) Semester 5 | Mumbai University | munotes

Contents

Module I Interfacing: LEDs and patterns, a Telegram bot, the TM1637 display, GPS, the ADS1115 and an oscilloscope, a 16x2 LCD over I2C, RFID, a fingerprint sensor, the camera, and a home automation system

1. How This Practical Is Examined: the Slip, the Journal and the Viva 1
2. The Laboratory from Zero: Raspberry Pi OS, Python, and Switching the Interfaces On 5
3. The Bench: the Forty Pin Header, Voltages, and Wiring Without Damage 12
4. Running and Testing a Pi Program When You Have No Pi in Front of You 18
5. Practical 1: One LED, and the Blink That Is Not a Loop 22
6. Practical 1 continued: Four Blinking Patterns, and Fading with PWM 26
7. Practical 2: a Telegram Bot That Switches the GPIO 30
8. Practical 2 continued: Keeping the Bot and the Token Safe 34
9. Practical 3: Driving the TM1637 Four Digit Display 38
10. Practical 3 continued: Showing the Current Time, and the Colon 44
11. Practical 4: the GPS Module, the Serial Port, and the NMEA Sentence 48
12. Practical 4 continued: Position, Fix Quality, and What Goes Wrong 53
13. Practical 5: the ADS1115, I2C, and Reading a Voltage 58
14. Practical 5 continued: Making the Pi Act as an Oscilloscope 64
15. Practical 6: the Sixteen by Two LCD Behind an I2C Backpack 69
16. Practical 7: the MFRC522 RFID Reader, and a Card's UID 76
17. Practical 7 continued: Writing to a Block, and the Keys That Guard It 81
18. Practical 8: the Fingerprint Sensor, Enrolling and Matching 86
19. Practical 9: the Pi Camera, a Still, a Video, and Picamera2 92
20. Practical 10: a Home Automation System on the Pi 97
21. Practical 10 continued: Schedules, Safe States, and the Whole Build 102

Module II Systems: matching on the LCD, a door lock, MQTT, a Flask dashboard, two factor authentication, motion detection, Node-RED, the Pi's own health, an auditable access control prototype, and Windows 10 IoT Core

1. Practical 11: Matched or Unmatched on the LCD 107
2. Practical 12: a Door Lock from a Fingerprint and a Relay 111
3. Practical 13: MQTT, a Broker, and Publisher and Subscriber 115
4. Practical 13 continued: Controlling the LED, QoS, Retain and the Last Will 120
5. Practical 14: a Flask Dashboard That Switches the Relay 125
6. Practical 14 continued: Making the Dashboard Safe on a Network 129
7. Practical 15: Two Factor Authentication at the Door 134
8. Practical 16: a Motion Detector with the Camera and the LCD 138
9. Practical 17: a Node-RED Flow, the Dashboard and the Push Button 143
10. Practical 17 continued: the Five Second Override and the Last State 147
11. Practical 18: Reading the Pi's Own CPU, Memory and Temperature 151
12. Practical 19: the Access Control Prototype, End to End 156
13. Practical 19 continued: the Event Log and the Audit 162
14. Practical 20: Windows 10 IoT Core, and What You Can Really Install 167
15. Keeping the Journal, and What Goes on the Page 171
16. A Worked Practical Slip: Q1, Q2 and Q3 175