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Introduction to Nodebots Steve Kinney

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About the Tessel 2

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

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

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GPIO: General purpose input/output.

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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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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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How to Breadboard

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Blinking an LED The “Hello World” of hardware.

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

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

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

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

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

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

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

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Act One: Button Meets LED

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Act Two: Button Meets the Web

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

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

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Light Me Up Sensing light and updating the web.

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Intruder Alert Using Third-Party APIs and a Door Sensor

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Water Me? Connecting with a soil moisture sensor.

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

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