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Arduino Due

Arduino Due and OLED display example

by shedboy71
written by shedboy71

This example uses an OLED display these typically come in a couple of different sizes 128×32 and 128×64, this particular example will use the I2C connection from the Micro:bit to the display. There are a couple of libraries that make life easier.

Lets look at a typical oled display

These will come in useful for various projects for example displaying the date and time or maybe temperature readings from a sensor

Connection

Pin Label Arduino PIN I2C Function Notes
GND Ground Ground 0V
VCC Power Power Regulated 5V supply.
SDA SDA / 20 SDA Serial data in
SCL SCL / 21 SCL  I2C clock

This layout shows a 128×32 connected to the Arduino Due, 128×64 I2C devices would be the same

 

Code

This example uses the https://github.com/adafruit/Adafruit_SSD1306/archive/master.zip and https://github.com/adafruit/Adafruit-GFX-Library/archive/master.zip , theer are several built in examples. I have modified one just to display text as further examples will write text to a display

 

[codesyntax lang=”cpp”]

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define OLED_RESET 4

Adafruit_SSD1306 display(OLED_RESET);

void setup()   
{                  
  Serial.begin(9600);   
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 128x32)  // init done  
  display.clearDisplay();  // text display tests  
  display.setTextSize(1);  
  display.setTextColor(WHITE);  
  display.setCursor(0,0);  
  display.println("Hello, world!");  
  display.setTextColor(BLACK, WHITE); // &#039;inverted&#039; text  
  display.println(3.141592);  
  display.setTextSize(2);  
  display.setTextColor(WHITE);  
  display.print("0x");   
  display.println(0xDEADBEEF, HEX);  
  display.display();  
  display.clearDisplay();
}
  
void loop() 
{  
}

[/codesyntax]

 

Link

1Pcs 128X64 OLED LCD LED Display Module For Arduino 0.96″ I2C IIC SPI Serial new original

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Projects

Espruino ultrasonic tape measure

by shedboy71
written by shedboy71

In the previous example using an HC-SRO4 ultrasonic sensor – Espruino and an ultrasonic distance sensor, we looked at displaying the distance to an object but just displayed this on the console but with the simple addition of an LCD display of some description we can make a basic ultrasonic tape measure project, in other words we will display the readings on an LCD. In this example I chose an I2C OLED display, these are nice and compact in size and easy to connect and use with our Espruino

Here is a typical oled display

i2c_oled_lcd

Connections

Wire the OLED up like this

OLED pin Espruino Pin
GND GND
5V 3.3/vBat
SDA B7
SCL B6

For the HC-SR04 you wire it up like this

HC-SR04 pin Espruino Pin
GND GND
Vcc VBAT (5v)
Trig A0
Echo A1

Layout

Here is a layout diagram which will hopefully show what you are trying to create

espruino-tape-measure_bb

 

Code

 

[codesyntax lang=”javascript”]

require("SSD1306");

var TRIG = A0; // ultrasonic trigger
var ECHO = A1; // ultrasonic echo signal
var g = require("SSD1306").connect(I2C1, logger);


// Get the distance from the sensor
setWatch(function(e) { t1=e.time; }, ECHO, { repeat:true, edge:'rising'  });
setWatch(function(e) { var dt=e.time-t1; dist = (dt*1000000)/57.0; },  ECHO, { repeat:true, edge:'falling' });
// 20 times a second, trigger the distance sensor
setInterval("digitalPulse(TRIG,1, 10/1000.0)",50);

function onInit() {
   logger();
}

function logger() {
  // if we detect we're getting too close, turn around
  //console.log(dist+" cm away");
  g.clear();
  dist = Math.round(dist*10)/10;
  g.setFontVector(15);
 // write some text
  g.drawString(dist + " cm away" ,0,0);
 // write to the screen
  g.flip(); 
}

// I2C
I2C1.setup({scl:B6,sda:B7});
var g = require("SSD1306").connect(I2C1, logger);

setInterval(logger, 1000);
onInit(); // start going forwards

[/codesyntax]

 

Testing

Pretty simple put an object at a certain distance from the HC-SR04 and check out the readings on the OLED display

 

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