Published February 6, 2015

No Touchy

My first run with the Edison: an antisocial little project that just wants to be left alone.

Full instructions provided1,644

Things used in this project

Hardware components

Intel Edison with Arduino Breakout Kit

Seeed Studio Grove starter kit plus for Intel Edison

We'll use the RGB LCD, buzzer, and touch sensor.

Story

I just got my hands on an Intel Edison and the Grove IoT Starter Kit Plus! To get acquainted, I started plugging things in and mashing up example code. Here's the result: a boundary-sensitive assembly, which is prone to freaking out a little bit when its bubble is breached.

I plugged in these sensors:

RGB LCD – in the second I2C port
Capacitive touch sensor – in port D3
Buzzer – in port D4

1 / 2 • Happy little sensors

I started with the Grove_Button sketch, which can be used for the touch sensor as well. It's supposed to turn on an LED, but I didn't have one on hand.

Instead, I added in the HelloWorld sketch for the LCD, which by default makes the screen red and displays "hello world!", with a time counter underneath. I interlaced its required libraries, etc. with the button code, and made it so that the screen is green by default, displaying "touchy touchy" on the first line. When the capacitive sensor is touched, the screen turns red and the second line shows a counter of the number of times it's been poked.

The poke-counter required me to increase the delay at the end of the loop. The button code had it set at 10ms, which was too fast, so it counted each poke as many increments. I upped this to 100ms, so now each finger-poke either doesn't register, or registers as two. GOOD ENOUGH.

Finally, I Scotch-taped in the Grove_Buzzer code. It plays "twinkle, twinkle little star" (or the alphabet song) by default, on loop, forever. I swapped that out for a single tone, but haven't yet trimmed the code to take out the extra stuff – just because I'll be playing with it more in the near future.

I might build a little case to stick the Edison in. I don't have one of the neat little breakout boards, nor will I likely be ordering custom PCBs for it, so it makes sense for me to keep it on the Arduino breakout board. Maybe a cigar box I've got laying around :)

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// Grove_Button + HelloWorld + Buzzer

#include <Wire.h>
#include "rgb_lcd.h"

rgb_lcd lcd;

const int colorR = 0;
const int colorG = 255;
const int colorB = 0;

const int pinButton = 3;                   // Touch sensor on D3
const int speakerPin = 4;                  // Buzzer on D4

int touchies = 0;

int length = 2; // the number of notes
char notes[] = "c "; // a space represents a rest
int beats[] = { 1, 7 };
int tempo = 300;

void playTone(int tone, int duration) {
    for (long i = 0; i < duration * 1000L; i += tone * 2) {
        digitalWrite(speakerPin, HIGH);
        delayMicroseconds(tone);
        digitalWrite(speakerPin, LOW);
        delayMicroseconds(tone);
    }
}

void playNote(char note, int duration) {
    char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
    int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };

    // play the tone corresponding to the note name
    for (int i = 0; i < 8; i++) {
        if (names[i] == note) {
            playTone(tones[i], duration);
        }
    }
}

void setup()
{
    pinMode(pinButton, INPUT);                  // set button INPUT
    pinMode(speakerPin, OUTPUT);
    
    // set up the LCD's number of columns and rows:
    lcd.begin(16, 2);
    
    lcd.setRGB(colorR, colorG, colorB);
    lcd.print("touchy touchy");
    
    delay(1000);
}

void loop()
{
    if(digitalRead(pinButton))                     // when button is pressed
    {
        // set the cursor to column 0, line 1
        // (note: line 1 is the second row, since counting begins with 0):
        playTone(1519, 5);
        lcd.setRGB(255, 0, 0);
        touchies = touchies + 1;
        // Print a message to the LCD.
        lcd.setCursor(0, 1);
        // print the number of seconds since reset:
        lcd.print(touchies);
    }
    else
    {
      lcd.setRGB(colorR, colorG, colorB);
    }
    
    delay(100);
}

Grove_TouchRGBuzz2.ino

// Grove_Button + HelloWorld + Buzzer

#include <Wire.h>
#include "rgb_lcd.h"

rgb_lcd lcd;

const int colorR = 0;
const int colorG = 255;
const int colorB = 0;

const int pinButton = 3;                   // Touch sensor on D3
const int speakerPin = 4;                  // Buzzer on D4

int touchies = 0;

int length = 2; // the number of notes
char notes[] = "c "; // a space represents a rest
int beats[] = { 1, 7 };
int tempo = 300;

void playTone(int tone, int duration) {
    for (long i = 0; i < duration * 1000L; i += tone * 2) {
        digitalWrite(speakerPin, HIGH);
        delayMicroseconds(tone);
        digitalWrite(speakerPin, LOW);
        delayMicroseconds(tone);
    }
}

void playNote(char note, int duration) {
    char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
    int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };

    // play the tone corresponding to the note name
    for (int i = 0; i < 8; i++) {
        if (names[i] == note) {
            playTone(tones[i], duration);
        }
    }
}

void setup()
{
    pinMode(pinButton, INPUT);                  // set button INPUT
    pinMode(speakerPin, OUTPUT);
    
    // set up the LCD's number of columns and rows:
    lcd.begin(16, 2);
    
    lcd.setRGB(colorR, colorG, colorB);
    lcd.print("touchy touchy");
    
    delay(1000);
}

void loop()
{
    if(digitalRead(pinButton))                     // when button is pressed
    {
        // set the cursor to column 0, line 1
        // (note: line 1 is the second row, since counting begins with 0):
        playTone(1519, 5);
        lcd.setRGB(255, 0, 0);
        touchies = touchies + 1;
        // Print a message to the LCD.
        lcd.setCursor(0, 1);
        // print the number of seconds since reset:
        lcd.print(touchies);
    }
    else
    {
      lcd.setRGB(colorR, colorG, colorB);
    }
    
    delay(100);
}