+++ SOLVED +++ More buttons , to show text at lcd or serialprint

Projects Programming
1

Hello all,

I 'am new with the arduino , but the examples in the getting started book is not the problem for me for first of this begin with the arduino,
Now i will do an experiment with more buttons and text ( display at serial or LCD ) , with one button it will works :wink:
But now i will make a sketch with more buttons,
So when i Push button one , the screen display as example button 1 is pressed
And when i push button two , the screen displays as example button 2 is pressed , and further and further,

Now i have make a simple sketch as example with one button (Door contact ) , but i like to make this sketch with more buttons:

/*

  • Door alarm switch test
    */
    #include <Wire.h>
    #include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

int switchPin = 2; // switch is connected to pin 2
int val; // variable for reading the pin status
int buttonState; // variable to hold the last button state

void setup() {

lcd.init();
lcd.backlight();
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);

pinMode(switchPin, INPUT); // Set the switch pin as input
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
Serial.begin(9600); // Set up serial communication at 9600bps
buttonState = digitalRead(switchPin); // read the initial state
}

void loop(){
val = digitalRead(switchPin); // read input value and store it in val

if (val != buttonState) { // the button state has changed!
if (val == LOW) { // check if the button is NOT pressed
lcd.clear();
Serial.println("Door contact 1 Restored "); // put at serial
lcd.println(" Door contact 1 "); // put text at row 1 lcd
lcd.setCursor(0, 1); // use row 2
lcd.print(" Restored ");// row 2 at lcd

} else { // the button is pressed...
lcd.clear();
Serial.println("Door contact 1 Activated ");// at serial
lcd.println(" Move Detection ");// row 1 at lcd
lcd.setCursor(0, 1);//row 2
lcd.print("** Activated **");//row 2 at lcd

}
}

buttonState = val; // save the new state in our variable
}

This sketch is working correct , for now ,
I hope someone can help me further !!!

smiley-mr-green

2

Unfortunately, that is a pretty lousy example. I prefer variable names that really indicate the value that they hold.

currState = digitalRead(switchPin);
if(currState !=prevState)
{
}
prevState = currState;

Now, looking at this, it is easy to modify to deal with 2 or more switches:

currState1 = digitalRead(switchPin1);
if(currState1 !=prevState1)
{
}
prevState1 = currState1;

currState2 = digitalRead(switchPin2);
if(currState2 !=prevState2)
{
}
prevState2 = currState2;
3

Thank's for reply PaulS,

But it will not work yet :0

With one button it works !!

But when i make this sketch for two buttons it will not work anymore,

look at this sketch :

/*

  • Alternating switch
    */
    #include <Wire.h>
    #include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

int switchPin = 2; // switch is connected to pin 2
int switchPin2 = 4; // switch is connected to pin 4
int prevState; // variable for reading the pin status
int prevState2; // variable for reading the pin status
int currState; // variable to hold the last button state
int currState2; // variable to hold the last button state

void setup() {

lcd.init();
lcd.backlight();
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);

pinMode(switchPin, INPUT); // Set the switch pin as input
pinMode(switchPin2, INPUT); // Set the switch pin as input

}
void loop(){
currState = digitalRead(switchPin);

if(currState !=prevState){
if(currState == LOW){
lcd.println(" ");
lcd.clear();

currState2 = digitalRead(switchPin2);

if(currState2 !=prevState2){
if(currState2 == LOW){
lcd.println(" ");
lcd.clear();

}
else {

prevState = currState;
prevState2 = currState2;

currState = digitalRead(switchPin);
if(currState !=prevState)
lcd.print(0, 0);
lcd.print("BUTTON-1=PRESSED ");

currState2 = digitalRead(switchPin2);
if(currState2 !=prevState2)
lcd.print(0, 0);
lcd.print("BUTTON-2=PRESSED ");

}
}
prevState = currState;
prevState2 = currState2;

}

This will not work , but with one button it works , when i push the button the LCD shows BUTTON-1= PRESSED
When i loss the button the lcd screen is empty , and that is what i will, but then with more buttons ????

This is working :

/*

  • Alternating switch
    */
    #include <Wire.h>
    #include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

int switchPin = 2; // switch is connected to pin 2
int prevState; // variable for reading the pin status
int currState; // variable to hold the last button state

void setup() {

lcd.init();
lcd.backlight();
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);

pinMode(switchPin, INPUT); // Set the switch pin as input

}
void loop(){
currState = digitalRead(switchPin);

if(currState !=prevState){
if(currState == LOW){
lcd.println(" ");
lcd.clear();
}
else {

prevState = currState;
currState = digitalRead(switchPin);
if(currState !=prevState)
lcd.print(0, 0);
lcd.print("BUTTON-1=PRESSED ");

}
}
prevState = currState;

}

Maby you can give me some information what i have to do ?

Thank's for read this !!

Patrick, The Netherlands.

4

If you open the first of those sketches, and use Tools + Auto format, you will see that you are only dealing with one switch if the other is pressed.

I don't think this meets the requirements you have defined.

You appear to want the two switches to be completely independent.

5

Hello PaulS,

I will use more buttons to switch over , and shows at the lcd screen at wath kind of input the switch is ,

can you give me a complete example please ?

Thank's for reading this ,

Patrick

6

can you give me a complete example please ?

You have a complete example for one switch. Simply copy all the code in loop, and paste it after the code currently in loop, and change the names in the pasted code

void loop()
{
   // Code to deal with switch one
   {
   }

   // Code to deal with switch two
   {
   }
}

Do not paste bits of code inside if or else blocks.

7

Dear PaulS,

It's working , i have make a simple test with 3 Buttons, during pushing one button it will shows at the display
BUTTON-1=PRESSED
BUTTON-2=PRESSED
BUTTON-3=PRESSED

find attached my sketch,

/*

  • Alternating switch
    */
    #include <Wire.h>
    #include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

int switchPin = 2; // switch is connected to pin 2
int switchPin1 = 4; // switch is connected to pin 4
int switchPin2 = 7; // switch is connected to pin 7
int prevState; // variable for reading the pin status
int currState; // variable to hold the last button state

void setup() {

lcd.init();
lcd.backlight();
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);

pinMode(switchPin, INPUT); // Set the switch pin as input
pinMode(switchPin1, INPUT); // Set the switch pin as input
pinMode(switchPin2, INPUT); // Set the switch pin as input

}
void loop(){
currState = digitalRead(switchPin);

if(currState !=prevState){

if(currState == LOW){
lcd.println(" ");
lcd.clear();

}

else {

prevState = currState;
currState = digitalRead(switchPin);
if(currState !=prevState)
lcd.print(0, 0);
lcd.print("BUTTON-1=PRESSED ");

}
}
prevState = currState;

currState = digitalRead(switchPin1);

if(currState !=prevState){
if(currState == LOW){
lcd.println(" ");
lcd.clear();
}
else {

prevState = currState;
currState = digitalRead(switchPin1);
if(currState !=prevState)
lcd.print(0, 0);
lcd.print("BUTTON-2=PRESSED ");

}
}
prevState = currState;

currState = digitalRead(switchPin2);

if(currState !=prevState){
if(currState == LOW){
lcd.println(" ");
lcd.clear();
}
else {

prevState = currState;
currState = digitalRead(switchPin2);
if(currState !=prevState)
lcd.print(0, 0);
lcd.print("BUTTON-3=PRESSED ");

}
}
prevState = currState;
}

Find the example at youtube , $)

Many thank's for your explain,

Best regards ,

Patrick , The Netherlands