Nodebots, Frontend Masters

Transcript

1. Introduction to Nodebots
   Steve Kinney
   

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3. About the Tessel 2
   

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5. It’s time for a feature list!
   • 64MB of RAM
   • 32MB of flash storage
   • 802.11 b/g/n WiFi and an Ethernet port
   • 2 USB ports
   • A WiFi router
   • JavaScript as a first-class citizen!
   

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6. The Tessel 2 can be programmed
   via USB or over WiFi.
   

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7. While I generally prefer WiFi, we’re going to use
   USB primarily today—mostly because we’re in
   a workshop together with a dozen Tessels.
   

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9. Ground
   3v3
   A0
   A1
   A2
   A3
   A4
   A5
   A6
   A7
   Ground
   3v3
   B0
   B1
   B2
   B3
   B4
   B5
   B6
   B7
   

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10. GPIO: General purpose
    input/output.
    

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11. Some Tasting Notes
    • All 16 pins can be used for GPIO.
    • Pins A4, A7, and all pins on the B port can be used for analog to digital
    input.
    • Pins A5, A6, B5, and B6 support pulse-width modulation.
    • Pins A0, A1, B0, and B1 support I2C serial communication.
    • UART is available on both A5 and B5 (TX) and A6 and B6 (RX).
    • Pin B7 supports digital-to-analog conversion.
    

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12. Ground
    3v3
    A0: I2C
    A1: I2C
    A2
    A3
    A4
    A5: PWM, UART/TX
    A6: PWM, UART/RX
    A7
    Ground
    3v3
    B0: ADC, I2C
    B1: ADC, I2C
    B2: ADC
    B3: ADC
    B4: ADC
    B5: ADC, PWM, UART/TX
    B6: ADC, PWM, UART/RX
    B7: ADC, DAC
    

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14. How to Breadboard
    

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16. Blinking an LED
    The “Hello World” of
    hardware.
    

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17. Source: https://pixabay.com/en/led-lamp-diode-electronics-light-543475/
    Negative
    Positive
    

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18. Polarity TL;DR
    • Polarized components (LEDs, batteries) have a right and a
    wrong way.
    • Non-polarized components (resistors, buttons) can be
    installed either way.
    

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20. Pulsing
    Not so easy when you’re
    working with 1s and 0s.
    

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21. Turing an LED off and on is very
    gratifying, but can we make it fade in
    and out?
    

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22. Well, here’s the problem with digital:
    It’s all ones and zeroes, right?
    

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23. Pulse Width Modulation
    Source: https://commons.wikimedia.org/wiki/File:Pwm_5steps.gif
    

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24. Pins 5 and 6 on either port
    are capable of PWM.
    

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26. Buttons
    It’s time to let the “real world”
    interact with our code.
    

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27. Act One: Button Meets
    LED
    

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29. Act Two: Button Meets the
    Web
    

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31. Rainbow LED
    What’s better than an LED
    that lights up in one color?
    

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33. What’s the Weather?
    Collecting information from the
    outside world.
    

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35. Light Me Up
    Sensing light and updating the
    web.
    

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37. Intruder Alert
    Using Third-Party APIs and a
    Door Sensor
    

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39. Water Me?
    Connecting with a soil
    moisture sensor.
    

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41. LCDs
    Display text like you’re a
    printer from the early 1990s.
    

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