Arduino Projects Experiments Part7

8/18/2019 Arduino Projects Experiments Part7

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Figure 14-5. The LCD News Reader Fritzing diagram

Example 14-1. The LCD News Reader sketch

/*

The LCD News Reader

20 August 2013

*/

// include the LCD library code:

#include

// set up pins on Arduino for LCD and test lead

LiquidCrystal lcd(12,11,5,4,3,2);

// set up the LCD's number of columns and rows

#define Xdelay 1900

String a;

String b;

String c;

String d;

Chapter 14: The LCD News Reader 123


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void setup() {

lcd.begin(16,2);

lcd.setCursor(0,0);

clearLCD();

backlightOn();

lcd.print("HELLO, WORLD!");

delay(Xdelay);

}

void loop()

{

char databuff[16];

char dispbuff[16];

// display on/off test

for(int x = 5; x>0; x--)

{

delay(1000);

displayOff();

delay(1000);

displayOn();

}

clearLCD();

backlightOn();

lcd.print("SLOW FADE ");

fadeOut(100);

fadeIn(10);

// light up all segments as a test

lcd.print("0123456789abcdef");

delay(Xdelay);

lcd.print("ghijklmnopqrstuv");

delay(Xdelay);

lcd.print("wxyz +?*&%$#()!=");

delay(Xdelay);

lcd.print(" ");

delay(Xdelay);

lcd.print(" "); delay(Xdelay);

a = "0123456789abcdef";

b = "ghijklmnopqrstuv";

c = "wxyz +?*&%$#()!=";

d = " ";

124 Make: Basic Arduino Projects


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selectLineTwo();

lcd.print(a);

delay(Xdelay);

selectLineOne();

lcd.print(a);

selectLineTwo();

lcd.print(b);

delay(Xdelay);

selectLineOne();

lcd.print(b);

selectLineTwo();

lcd.print(c);

delay(Xdelay);

selectLineOne();

lcd.print(c);

selectLineTwo();

lcd.print(d);

delay(Xdelay);

selectLineOne();

lcd.print(d);

selectLineTwo();

lcd.print(d);

delay(Xdelay);

for (int x = 0; x=0; i--)

{

goTo(i);

if (i%4 == 1)

lcd.print("- ");

if (i%4 == 2)

lcd.print("I ");

if (i%4 == 3)

lcd.print("- ");

if (i%4 == 0)

lcd.print("I ");

delay(100);

}

for(int i =0; i


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void selectLineOne()

{

lcd.write(0xFE); //command flag

lcd.write(128); //position

delay(10);

}

void selectLineTwo()

{


lcd.write(192); //position

delay(10);

}

void goTo(int position)

{

if (position


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}

void displayOn()

{


lcd.write(0x0C); //clear command

delay(10);

}

void displayOff()

{


lcd.write(0x08); //clear command

delay(10);

}

void fadeOut(int fade)

{

for (int x = 157; x>128; x--)

{

backlightValue(x);

delay(fade);

}

}

void fadeIn(int fade)

{

for (int x = 128; x


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Figure 14-7. The LCD News Reader block diagram

Figure 14-8. The LCD News Reader circuit schematic diagram

Something to Think AboutHow can a pushbutton switch be used to control the display?

Chapter 14: The LCD News Reader 129


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Figure 15-2. Fritzing diagram for a logic tester with an RGB LED

Upload the Logic Tester SketchWith the Logic Tester built, it’s time to upload the sketch. As shown in

Example 15-1, the sketch operates an RGB LED using a pushbutton switch and two

fixed resistors. Here are the steps you’ll need to follow:

1. Attach the Arduino to your computer using a USB cable.

2. Open the Arduino software and type Example 15-1 into the software’s texteditor.

3. Upload the sketch to the Arduino.

Once the Logic Tester sketch has been uploaded to the Arduino microcontroller, the

RGB’s red LED will be on, as shown in Figure 15-1. Attaching the long test wire to

the +5VDC source on the MakerShield and pressing the pushbutton switch will allow

the RGB green LED to turn on, as shown in Figure 15-3.

Example 15-1. The Logic Tester sketch

/*

Logic Tester with RGB LED

Turns on the green LED when a logic "1" (+5V) signal is detected. The

red LED will turn on at logic "0" (0V) signal. Also, when powering up the Arduino the red LED is on.

4 May 2013

Don Wilcher

*/

Chapter 15: A Logic Tester (with an RGB LED) 133


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Figure 15-5. The Logic Tester Fritzing circuit schematic diagram

Something to Think AboutHow can the Logic Tester be operated without a pushbutton switch?



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Figure 16-1. A Logic Tester with an LCD

Let’s Build a Logic TesterBuilding this tester requires the use of an LCD. If this is your first time using an LCD,

I suggest reading Chapter 14. For help adding the 16-pin male header to the LCD,

see Figure 14-2 and Figure 14-3. The 10KΩ potentiometer’s center pin is wired to

pin number 3 of the LCD. The potentiometer’s remaining pins should be wired to

+5VDC and ground. Place the LCD onto the solderless breadboard, as shown inFigure 16-2. LCD pin numbers 1 and 2 are wired to ground and +5VDC, respectively.

Adjust the 10KΩ potentiometer contrast control for the LCD for proper pixel-square

visibility. For reference on how to do this, see Figure 14-4.

Complete the rest of the tester wiring using the Fritzing diagram shown in

Figure 16-2.



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+5V source, as shown in Figure 16-3. Impress the local Makerspace by testing Ar-duino and digital electronic circuits with your Logic Tester!

Example 16-1. The Logic Tester sketch

/*

Logic Tester

LCD displays "HIGH (1)" when digital circuit signal is +5V. A "LOW (0)"

is displayed when digital circuit signal is OV.

27 April 2013

Don Wilcher

*/

// include the LCD library code:#include

// set up pins on Arduino for LCD and transistor lead:

LiquidCrystal lcd(12,11,5,4,3,2);

int xistorPin = 6;

int digitalStatus = 0; // variable for reading the digital circuit state

// initialize the transistor pin as an input and set up the LCD's number

// of columns and rows:

void setup() {

lcd.begin(16,2);

lcd.setCursor(0,0);

lcd.print("LOGIC TESTER");

pinMode(xistorPin, INPUT);

}

void loop() {

// check if digital signal is HIGH or LOW:

digitalStatus = digitalRead(xistorPin);

if (digitalStatus == HIGH) {

// if digital circuit signal is +5V, display HIGH (1):

lcd.setCursor(0,1);

lcd.print("HIGH (1) "); // display HIGH (1)

}

else {

// if digital circuit signal is 0V, display LOW (0):

lcd.setCursor(0,1);

lcd.print(" LOW (0) ");

}

}


Arduino Projects Experiments Part7

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