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Norse IoT Websocket Workshop

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Your Presenters

Cassian Godsted

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Your Presenters

Aaron Milner

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Your Presenters

Riley Weber-Horowitz

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Your Presenters

Zack Sargent

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So, what is IoT?

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  • The Internet of Things (IoT) describes the network of physical objects — "things" — that are embedded with sensors, software, and other technologies for the purpose of connecting and exchanging data with other devices and systems over the internet.

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  • Range from ordinary household objects to sophisticated industrial tools.

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  • 10 billion connected IoT devices today; 22 billion by 2025. (source: Oracle)

wiki.norseiot.club

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ESP-32

Arduino Uno

Raspberry Pi

What powers IoT?

wiki.norseiot.club

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ESP-32

Function

Spec

Microcontroller

Xtensa Dual-Core 32-bit LX6

Clock Speed

240 MHz

Flash Memory

4 MB

SRAM

520 KB

Operating Voltage/Input Voltage

3.3V DC / 2.2-3.6V DC

Current Consumption

80-90 mA, 5μA deep sleep

DC Current per IO Pin

40 mA

Digital IO Pins

36

Analog IO Pins

18

3

4

2

Yes v2.0

16

Network

802.11 b/g/n, Bluetooth 4.2,

Ethernet (supported)

$5 - $10

In a nutshell…

  • Powerful, lightweight chip.
  • Useful for many scenarios.
  • Wi-Fi/Bluetooth/Matter enabled allowing for various projects.

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What We’re Building

  • A Wi-Fi Enabled Game Controller
  • Will feature four buttons to send responses and a buzzer to communicate right/wrong.
  • Will send data to an open-source Kahoot clone through Websockets.
  • Will receive data (correct/incorrect) and make a noise.

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The Hardware

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Don’t lose your wires!

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Don’t mix them with other groups!

Be Careful!!

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Components: Rahoot Server

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Receives data over Websockets and displays it on a website.

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Components: Wires

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Connects Point A (Microcontroller) to Point B (Sensor)

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Components: Breadboards

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Allows for easy and adaptable assembly of the microcontroller with input and output devices

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Components: Breadboards

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Allows for easy and adaptable assembly of the microcontroller with input and output devices

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Components: Buzzer

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  • Passive buzzers can play tones!
  • (Active buzzers cannot play tones)

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Components: Button

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Components: Button

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Theory: Volts & Amps

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Theory: Volts & Amps

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Theory: Pull Up / Down Resistor

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Theory: Pull Up / Down Resistor

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The Software

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Software

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  • C++ code that reads data from buttons and sends the data over Wi-Fi through Websockets.

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https://github.com/Norse-IoT/Rahoot

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Websockets?

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  • Websockets are an API that allows for a client and server to maintain constant communication.
  • Used in applications like…
    • Discord, to allow communication between you and your friends
    • Minecraft server consoles, to get live updates on your server.

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Let’s Build It!

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Don’t lose your wires!

​

Don’t mix them with other groups!

Be Careful!!

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STEP 1: Pull out the breadboard

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STEP 2: Put on ESP-32

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STEP 3: Put on Buttons

WARNING: Button prongs are very fragile!!

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STEP 4: Attach Orange Ground Wires

19

22

25

30

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STEP 4: Put on Ground Wires

19

22

25

30

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STEP 5: Put on Buzzer

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STEP 6: Red Ground Wires

6

25

30

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STEP 7: Add Yellow Power Wires

28

18

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STEP 7: Add Yellow Power Wires

27

17

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STEP 8: Add White Power Wires

28

13

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STEP 8: Add First White Wire

28

13

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STEP 8: Add White Power Wires

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12

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STEP 9: Add Teal Wire

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11

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STEP 10: Play!

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