Physical Computing: 2

Slides are here:
http://mhellar.github.io/physcomp2/1

Grab the code here:
https://bit.ly/2sfx2Bm

Topics for This Week:

Raspberry Pi Discussion
Serial Port Module Revisited
The Johnny Five Library
Creating a Twitter Lamp
Create and Twitter Button
API to LCD

The HC-SR04 ultrasonic sensor uses sonar to determine distance to an object like bats do. It offers excellent non-contact range detection with high accuracy and stable readings in an easy-to-use package. From 2cm to 400 cm or 1” to 13 feet. It operation is not affected by sunlight or black material like Sharp rangefinders are (although acoustically soft materials like cloth can be difficult to detect). It comes complete with ultrasonic transmitter and receiver module.

Upload the Arduino sketch in hc-04-code/hc-04 and then check the output in the serial monitor

Open hc04_p5js in a text editor and the terminal. Change the port. NPM install. Make slight change to Arduino code. Node app.js and open localhost:3000 in your browser

ADXL354 accelerometer

An accelerometer is an electromechanical device that will measure acceleration forces. These forces may be static, like the constant force of gravity pulling at your feet, or they could be dynamic - caused by moving or vibrating the accelerometer.By measuring the amount of static acceleration due to gravity, you can find out the angle the device is tilted at with respect to the earth. By sensing the amount of dynamic acceleration, you can analyze the way the device is moving.

ADXL354 accelerometer

Connect
GND to GND
3v to 3v
SCL to A5
SDA to A4

Open the Library Manager in Arduino
Install Adafruit ADXL Library
Install Adafruit Universal Sensor Library
Install ArduinoJSON Library
Run Sensortest from the Examples

Before going further lets a take looks at Arduino JSON
Upload JsonGeneratorExample
Open the serial monitor at 9600 BAUD

From arduino upload adxl345_json_serial.ino
This adds ArduinoJSON to the Sensortest
cd adxl_threejs_serial & open in text editor
Edit port setting on line 8 of index.js
NPM install & node index.js & open localhost:3000

Json.parse()

Fun with shaders
cd adxl_threejs_serial_shader & open in text editor
Edit port setting on line 8 of index.js
NPM install & node index.js & open localhost:3000

Johnny-Five is the original JavaScript Robotics programming framework. Released by Bocoup in 2012, Johnny-Five is maintained by a community of passionate software developers and hardware engineers. Over 75 developers have made contributions towards building a robust, extensible and composable ecosystem.

Starting a new Node app

Create a new folder named, 'J5_led_1'
Open the terminal
type 'cd' & space
drag your folder to the terminal and hit return

Now we are in our new folder in the terminal
Type 'npm init' & hit return
fill out the questions
drag your folder onto Sublime Text

type 'npm install johnny-five --save
Have a look at the package.json file that was generated
This stores metadata about our app

contents of package.json

{
  "name": "J5_led_1",
  "version": "1.0.0",
  "description": "A Johnny Five LED app",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "johnny-five": "^0.8.106"
  }
}

create a new file, enter the following code and save as index.js in your new folder

var five = require("johnny-five");
var board = new five.Board();

board.on("ready", function() {
  var led = new five.Led(6);
  led.blink(500);
});

!!! Upload firmata to arduino !!!
run 'node index.js' at the terminal

try a pulse

var five = require("johnny-five");
var board = new five.Board();

board.on("ready", function() {
  var led = new five.Led(6);
led.pulse(500);
});

Led Animations

var five = require("johnny-five");
var board = new five.Board();

board.on("ready", function() {
  var led = new five.Led(6);
led.pulse({
  easing: "linear",
  duration: 3000,
  cuePoints: [0, 0.2, 0.4, 0.6, 0.8, 1],
  keyFrames: [0, 10, 0, 50, 0, 255],
  onstop: function() {
    console.log("Animation stopped");
  }
});
});

Reference

LED API
Animation API
Full API

Project: Twitter Lamp

Make this circuit

Go Here:

https://apps.twitter.com/

create a new app

Gather tokens and keys

Update code in code/twitter-ard/app.js

var client = new Twitter({
    consumer_key: 'Enter Here',
    consumer_secret: 'Enter Here',
    access_token_key: 'Enter Here',
    access_token_secret: 'Enter Here'
})

From the terminal:

'cd twitter-ard'

'node app.js'

From the terminal:

'cd twitter-ard-location'

'node app.js'

Twitter API Reference

Here

Project: Twitter Button

Update code in code/twitter-ard/app.js

var client = new Twitter({
    consumer_key: 'Enter Here',
    consumer_secret: 'Enter Here',
    access_token_key: 'Enter Here',
    access_token_secret: 'Enter Here'
})