Nodebots, Frontend Masters

Transcript

1. Introduction to Nodebots Steve Kinney
3. About the Tessel 2
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!
6. The Tessel 2 can be programmed via USB or over WiFi.
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.
9. Ground 3v3 A0 A1 A2 A3 A4 A5 A6 A7 Ground 3v3 B0 B1 B2 B3 B4 B5 B6 B7
10. GPIO: General purpose input/output.
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.
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
14. How to Breadboard
16. Blinking an LED The “Hello World” of hardware.
17. Source: https://pixabay.com/en/led-lamp-diode-electronics-light-543475/ Negative Positive
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.
20. Pulsing Not so easy when you’re working with 1s and 0s.
21. Turing an LED off and on is very gratifying, but can we make it fade in and out?
22. Well, here’s the problem with digital: It’s all ones and zeroes, right?
23. Pulse Width Modulation Source: https://commons.wikimedia.org/wiki/File:Pwm_5steps.gif
24. Pins 5 and 6 on either port are capable of PWM.
26. Buttons It’s time to let the “real world” interact with our code.
27. Act One: Button Meets LED
29. Act Two: Button Meets the Web
31. Rainbow LED What’s better than an LED that lights up in one color?
33. What’s the Weather? Collecting information from the outside world.
35. Light Me Up Sensing light and updating the web.
37. Intruder Alert Using Third-Party APIs and a Door Sensor
39. Water Me? Connecting with a soil moisture sensor.
41. LCDs Display text like you’re a printer from the early 1990s.