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‎README.md

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# making-things-smart
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Code examples for the Making Things Smart book
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# Making Things Smart
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Extra information for the 'Making Things Smart' book by Gordon Williams
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This code is designed for [Espruino JavaScript Microcontroller boards](http://www.espruino.com/Order)
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## Code Examples
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### Chapter 5
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* [Experiment 4 Part 1](experiment4a.js)
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* [Experiment 4 Part 2](experiment4b.js)
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* [Experiment 5](experiment5.js)
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### Chapter 6
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* [Experiment 6](experiment6.js)
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* [Experiment 7](experiment7.js)
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* [Experiment 8](experiment8.js)
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### Chapter 7
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* [Experiment 9 Part 1](experiment9a.js)
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* [Experiment 9 Part 2](experiment9b.js)
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* [Experiment 9 Part 3](experiment9c.js)
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* [Experiment 9 Part 4](experiment9d.js)
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* [Experiment 10 Part 1](experiment10a.js)
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* [Experiment 10 Part 2](experiment10b.js)
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### Chapter 8
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* [Experiment 11](experiment11.js)
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* [Experiment 12](experiment12.js)
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* [Experiment 13](experiment13.js)
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### Chapter 9
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* [Experiment 14 Part 1](experiment14a.js)
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* [Experiment 14 Part 2](experiment14b.js)
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* [Experiment 14 Part 3](experiment14c.js)
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* [Experiment 14 Part 4](experiment14d.js)
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### Chapter 10
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* [Experiment 15](experiment15.js)
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### Chapter 11
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* [Experiment 16](experiment16.js)
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### Chapter 13
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* [Experiment 19 Part 1](experiment19a.html)
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* [Experiment 19 Part 2](experiment19b.html)
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* [Experiment 20](experiment20.html)
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* [Experiment 21](experiment21.html)
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* [Experiment 22](experiment22.html)
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### Chapter 14
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* [Experiment 25](experiment25.js)
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* [Experiment 26](experiment26.html)
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### Chapter 15
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* [Experiment 28](experiment28.js)
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* [Experiment 29](experiment29.js)
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* [Experiment 30](experiment30.js)
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* [Experiment 31](experiment31.js)
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* [Experiment 32](experiment32.js)
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### Chapter 16
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* [Experiment 34 Espruino JavaScript](experiment34.js)
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* [Experiment 34 HTML](experiment34.html)
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* [Experiment 35](experiment35.js)
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* [Experiment 36 Espruino JavaScript](experiment36.js)
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* [Experiment 36 HTML](experiment36.html)
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### Chapter 17
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* [Experiment 38 Part 1](experiment38a.js)
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* [Experiment 38 Part 2](experiment38b.js)
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* [Experiment 38 Part 3 HTML](experiment38c.html)
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* [Experiment 38 Part 4 HTML](experiment38d.html)
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* [Experiment 38 Part 5](experiment38e.js)
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### Chapter 18
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* [Experiment 39 HTML Test page](experiment39.html)
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* [Experiment 39 Part 1](experiment39a.js)
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* [Experiment 39 Part 2](experiment39b.js)
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## Purchasing Information
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Where to find some of the component parts used in the book.
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... to come soon.

‎experiment10a.js

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var SENSE = A8;
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var LIGHT = B6;
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var counter = 0;
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var blades = 7;
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var t = 1000 / blades;
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var pulses = [5];
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for (var i=0;i<blades;i++) pulses.push(t-5, 5);
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var lastPulseTime;
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function onChanged(e) {
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counter++;
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if (counter&1) {
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var d = e.time - lastPulseTime;
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lastPulseTime = e.time;
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var p = pulses.map(function(t) { return t*d; });
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digitalPulse(LIGHT, 1, p);
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}
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}
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pinMode(SENSE, "input_pullup");
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setWatch(onChanged, SENSE, { edge:"rising", repeat:true });

‎experiment10b.js

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var SENSE = A8;
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var LIGHT = B6;
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var counter = 0;
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var blades = 7; // number of fan blades
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var t = 1000 / blades;
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var pulses = [ // ensure one line per fan blade
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50, t-50,
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5, 40, 5, t-50,
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5, 40, 5, t-50,
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5, 40, 5, t-50,
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5, 40, 5, t-50,
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5, 40, 5, t-50,
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50];
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var lastPulseTime;
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function onChanged(e) {
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counter++;
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if (counter&1) {
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var d = e.time - lastPulseTime;
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lastPulseTime = e.time;
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var p = pulses.map(function(t) { return t*d; });
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digitalPulse(LIGHT, 1, p);
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}
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}
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pinMode(SENSE, "input_pullup");
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setWatch(onChanged, SENSE, { edge:"rising", repeat:true });

‎experiment10c.js

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var SENSE = A8;
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var LIGHT = B6;
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var counter = 0;
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var blades = 7; // number of fan blades
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var t = 1000 / blades;
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var pulses = [50];
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var lastPulseTime;
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function onChanged(e) {
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counter++;
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if (counter&1) {
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var d = e.time - lastPulseTime;
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lastPulseTime = e.time;
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var p = pulses.map(function(t) { return t*d; });
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digitalPulse(LIGHT, 1, p);
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}
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}
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pinMode(SENSE, "input_pullup");
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setWatch(onChanged, SENSE, { edge:"rising", repeat:true });
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function toPulses(img) {
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pulses = [];
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// We're pulsing high at the start of the image
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var lastPixel = true;
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// the time the light will be on or off for
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var time = 0;
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// iterate over the image
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for (var y in img) {
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var line = img[y];
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for (var x in line) {
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var pixel = line[x]!=" ";
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if (pixel!=lastPixel) {
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// if this pixel is different, output the time
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pulses.push(time);
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time = 0;
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lastPixel = pixel;
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}
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time += 5;
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}
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// end of line, turn off
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if (lastPixel) {
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pulses.push(time);
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time = 0;
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lastPixel = false;
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}
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time += t - line.length*5;
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}
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}
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toPulses([
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"XX XX",
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"XX XX",
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" ",
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"X X",
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" X X ",
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" XXXX "]);
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/* or...
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toPulses([
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"XXXXX",
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"X X",
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"X X",
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"XXXXX",
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"X X",
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"X X",
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"XXXXX"]);
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*/

‎experiment11.js

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// the position of the motor
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var pos = 0;
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// To be called every so often to tell the servo where to go
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function updateServo() {
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digitalPulse(B3, 1, E.clip(1.5+pos, 1, 2));
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}
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// Now make sure we call the function every 50ms
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setInterval(updateServo, 50);
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/*
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// To move the servo around
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function updateServo() {
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pos = Math.sin(getTime()) * 0.5;
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digitalPulse(B3, 1, E.clip(1.5+pos, 1, 2));
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}
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// Tomove the servo using PWM
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function updateServo() {
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pos = Math.sin(getTime()) * 0.5;
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var len = E.clip(1.5+pos, 1, 2);
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analogWrite(B3, len/50, {freq:20})
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}
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*/

‎experiment12.js

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var motors = [0,0];
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function updateServos() {
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// Left
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digitalPulse(B3, 1, E.clip(1.5+motors[0], 1, 2));
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// Right
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digitalPulse(B4, 1, E.clip(1.5-motors[1], 1, 2));
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}
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setInterval(updateServos, 20);
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// the names of our movements
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var FWD = [1,1];
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var BACK = [0,0];
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var LEFT = [-1,1];
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var RIGHT = [1,-1];
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var STOP = [0,0];
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function go(moves) {
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// take the first command off our array
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var move = moves.shift();
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if (move) {
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// Move the motors
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motors = move;
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// Call ourselves again in half a second, with the remaining list of moves
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setTimeout(go, 500, moves);
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} else
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motors = STOP;
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}
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setWatch(function() {
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go([FWD,LEFT,FWD,BACK]);
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}, BTN, {repeat:true, edge:"rising", debounce:50});

‎experiment13.js

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var motors = [0,0];
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function updateServos() {
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var left = darkValue - analogRead(A5);
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if (left < 0) left = 0;
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var right = darkValue - analogRead(A6);
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if (right < 0) right = 0;
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motors[0] = right;
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motors[1] = left;
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digitalPulse(B3, 1, E.clip(1.5+motors[0], 1, 2));
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digitalPulse(B4, 1, E.clip(1.5-motors[1], 1, 2));
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}
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setInterval(updateServos, 20);

‎experiment14a.js

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// Draws a circle
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var PEN_DOWN = PEN_DOWN_VALUE_HERE; // motors[2] when pen touches paper
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var PEN_UP = PEN_UP_VALUE_HERE; // motors[2] when pen is away from paper
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var OFFSET_LEFT = 0.1; // offset to make left servo horizontal
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var OFFSET_RIGHT = -0.1; // offset to make right servo horizontal
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var motors = [0,0,PEN_UP];
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function updateServos() {
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getNewPosition();
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digitalPulse(B3, 1, E.clip(1.5+(motors[0]+OFFSET_LEFT), 1, 2));
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digitalPulse(B3, 1, 0); // wait for pulse
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digitalPulse(B4, 1, E.clip(1.5-(motors[1]+OFFSET_RIGHT), 1, 2));
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digitalPulse(B4, 1, 0); // wait for pulse
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digitalPulse(B5, 1, E.clip(1.5+motors[2], 1, 2)); // Pen
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}
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var pos = 0;
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var size = 0.1;
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function getNewPosition() {
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// increment pos slowly between 0 and 1
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pos += 0.002;
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if (pos > 1) pos = 0;
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// Work out an angle between 0 and 360 degrees, but in Radians
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var angle = pos * Math.PI * 2;
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// Now use sin and cos to move the servos in a circular motion
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motors[0] = Math.sin(angle)*size;
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motors[1] = Math.cos(angle)*size;
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}
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setInterval(updateServos, 20);

‎experiment14b.js

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// Draws a diamond
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var PEN_DOWN = PEN_DOWN_VALUE_HERE; // motors[2] when pen touches paper
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var PEN_UP = PEN_UP_VALUE_HERE; // motors[2] when pen is away from paper
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var OFFSET_LEFT = 0.1; // offset to make left servo horizontal
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var OFFSET_RIGHT = -0.1; // offset to make right servo horizontal
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var motors = [0,0,PEN_UP];
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function updateServos() {
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getNewPosition();
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digitalPulse(B3, 1, E.clip(1.5+(motors[0]+OFFSET_LEFT), 1, 2));
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digitalPulse(B3, 1, 0); // wait for pulse
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digitalPulse(B4, 1, E.clip(1.5-(motors[1]+OFFSET_RIGHT), 1, 2));
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digitalPulse(B4, 1, 0); // wait for pulse
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digitalPulse(B5, 1, E.clip(1.5+motors[2], 1, 2)); // Pen
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}
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var pos = 0;
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var size = 0.1;
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function getNewPosition() {
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// increment pos slowly between 0 and 1
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pos += 0.002;
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if (pos > 1) pos = 0;
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// Multiply by 4, for each edge of the square
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var sq = pos*4;
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// Now set the position for each edge:
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if (sq<1) { // top edge
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motors[0] = (sq-0.5)*2*size;
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motors[1] = -size;
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} else if (sq<2) { // right edge
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motors[0] = size;
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motors[1] = (sq-1.5)*2*size;
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} else if (sq<3) { // bottom edge
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motors[0] = (2.5-sq)*2*size;
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motors[1] = size;
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} else { // left edge
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motors[0] = -size;
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motors[1] = (3.5-sq)*2*size;
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}
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}
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setInterval(updateServos, 20);

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