/*
Project Title: Switch Counter using LCD and Increment and Decrement Buttons
Link: www.newtechandme.com
The circuit:
* LCD RS pin to digital pin 13
* LCD Enable pin to digital pin 12
* LCD D4 pin to digital pin 11
* LCD D5 pin to digital pin 10
* LCD D6 pin to digital pin 9
* LCD D7 pin to digital pin 8
* LCD R/W pin to ground
* Increment button to digital pin 2
* Decrement button to digital pin 3
*/
// include the library code:
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);
//Set buttons pin numbers
byte incrementButton = 2;
byte decrementButton = 3;
//Global variables
int incrementState = 0; //variable that will read the increment button (either HIGH or LOW)
int decrementState = 0; //variable that will read the decrement button (either HIGH or LOW)
int counter = 0; //variable that will store the count
int lastIncrementState = 0;
int lastDecrementState = 0;
void setup()
{
pinMode(incrementButton, INPUT); //set incrementButton as INPUT
pinMode(decrementButton, INPUT); //set decrementButton as INPUT
lcd.begin(16, 2); //set up the LCD's number of columns and rows:
lcd.print("NewTechandMe.com"); //print a message on the LCD
}//end of setup
void loop()
{
lcd.setCursor(0, 1);
incrementState = digitalRead(incrementButton); //read the increment button state
decrementState = digitalRead(decrementButton); //read the decrement button state
if(incrementState != lastIncrementState) //compare increment button state to its last state
{
if(incrementState == LOW)//increment button is pressed
{
counter = counter + 1; //increment the counter
lcd.print(counter); //print it on serial monitor
lcd.print(" "); //16 blank spaces
delay(20); //debounce delay
}
}
lastIncrementState = incrementState;
if(decrementState != lastDecrementState)//compare decrement state to its lastState
{
if(decrementState == LOW)//decrement button is pressed
{
counter = counter - 1; //decrement the counter
lcd.print(counter); //print it on serial monitor
lcd.print(" "); //16 blank spaces
delay(20); //debounce delay
}
}
lastDecrementState = decrementState;
}//end of loop
It seems to work 8), but i would like it to do a few different things:
I would like it to count up to 3 then reset back to 0, (0-1-2-3) use only 1 button (known as filter)
and print to lcd 1Khz,1.5Khz,2.0Khz,2.5Khz overwriting the 1st.
Also have 4 outputs going high one at a time, to drive a relay driver, prob a transistor to 12v out.
Not to good at coding, but trying to learn, so need some pointers.
Hi all,
Well i found this sketch and modded it
and it works ok, but on power up the display is blank
and i wanted it to show the first case
//ssb audio filter button
#include <LiquidCrystal.h>
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);
// set up a constant for the switchPin
const int switchPin = 2;
// variable to hold the value of the switchPin
int switchState = 0;
// variable to hold previous value of the switchpin
int prevSwitchState = 0;
int buttonPushCounter = -1; // counter for the number of button presses
void setup() {
// set up the number of columns and rows on the LCD
lcd.begin(16, 2);
// set up the switch pin as an input
pinMode(switchPin,INPUT);
lcd.setCursor(0, 0);
//Setup Filter Outputs
pinMode(3, OUTPUT); //Initiates 1Khz pin
pinMode(4, OUTPUT); //Initiates 1.5Khz pin
pinMode(5, OUTPUT); //Initiates 2.0Khz pin
pinMode(6, OUTPUT); //Initiates 2.5Khz pin
}
void loop() {
// check the status of the switch
switchState = digitalRead(switchPin);
// compare the switchState to its previous state
if (switchState != prevSwitchState) {
if (switchState == LOW) {
buttonPushCounter ++;
buttonPushCounter %= 4;
// clean up the screen before printing a new reply
lcd.clear();
switch (buttonPushCounter)
{
case 0:
lcd.print("1Khz");
//delay(3000);
digitalWrite(3, HIGH); //Output on
digitalWrite(4, LOW); //Output off
//delay(1000);
digitalWrite(5, LOW); //Output off
digitalWrite(6, LOW); //Output off
break;
case 1:
lcd.print("1.5Khz");
//delay(3000);
digitalWrite(3, LOW); //Output off
digitalWrite(4, HIGH); //Output on
// delay(1000);
digitalWrite(5, LOW); //Output off
digitalWrite(6, LOW); //Output off
break;
case 2:
lcd.print("2.0Khz");
//delay(3000);
digitalWrite(3, LOW); //Output off
digitalWrite(4, LOW); //Output on
// delay(1000);
digitalWrite(5, HIGH); //Output off
digitalWrite(6, LOW); //Output off
break;
case 3:
lcd.print("2.5Khz");
//delay(3000);
digitalWrite(3, LOW); //Output off
digitalWrite(4, LOW); //Output on
// delay(1000);
digitalWrite(5, LOW); //Output off
digitalWrite(6, HIGH); //Output off
break;
}
}
}
// save the current switch state as the last state
prevSwitchState = switchState;
}
That's one way. The other is to move the switch statement outside of the if() block that checks for a switch transition (to pressed).
Is that line 37 of the code below ?, if so where do i place it ?
//ssb audio filter button
#include <LiquidCrystal.h>
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);
const int switchPin = 2; // set up a constant for the switchPin
int switchState = 0; // variable to hold the value of the switchPin
int prevSwitchState = 0; // variable to hold previous value of the switchpin
int buttonPushCounter = -1; // counter for the number of button presses
void setup() {
lcd.begin(16, 2); // set up the number of columns and rows on the LCD
pinMode(switchPin,INPUT); // set up the switch pin as an input
lcd.setCursor(0, 0);
//Setup Filter Outputs
pinMode(4, OUTPUT); //Initiates off pin
pinMode(5, OUTPUT); //Initiates 1.5Khz pin
pinMode(6, OUTPUT); //Initiates 2.0Khz pin
pinMode(7, OUTPUT); //Initiates 2.5Khz pin
}
void loop() {
// check the status of the switch
switchState = digitalRead(switchPin);
// compare the switchState to its previous state
if (switchState != prevSwitchState) {
if (switchState == LOW) {
buttonPushCounter ++;
buttonPushCounter %= 4;
lcd.clear(); // clean up the screen before printing
switch (buttonPushCounter)
{
case 0:
lcd.print("Off");
//delay(3000);
digitalWrite(4, HIGH); //Output on
digitalWrite(5, LOW); //Output off
//delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, LOW); //Output off
break;
case 1:
lcd.print("1.5Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, HIGH); //Output on
// delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, LOW); //Output off
break;
case 2:
lcd.print("2.0Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, LOW); //Output on
// delay(1000);
digitalWrite(6, HIGH); //Output off
digitalWrite(7, LOW); //Output off
break;
case 3:
lcd.print("2.5Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, LOW); //Output on
// delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, HIGH); //Output off
break;
}
}
}
prevSwitchState = switchState; // save the current switch state as the last state
}
The display of anything is conditional upon you changing the switch state.
So, to display the default state, you have to remove that dependency, so either the end of setup, or the top of loop.
Look at the code inside "loop".
Anything that ends up on the LCD can only be put there because switchState is LOW, and you only do that test because the current state is different to the previous state.
So, if you want anything to appear on the LCD without having to press buttons, move the code that displays stuff outside those conditions.
I'm posting from my phone, so I won't be cutting and,pasting any code for you.
//ssb audio filter button
#include <LiquidCrystal.h>
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);
const int switchPin = 2; // set up a constant for the switchPin
int switchState = 0; // variable to hold the value of the switchPin
int prevSwitchState = 0; // variable to hold previous value of the switchpin
int buttonPushCounter = -1; // counter for the number of button presses
void setup() {
lcd.begin(16, 2); // set up the number of columns and rows on the LCD
pinMode(switchPin,INPUT); // set up the switch pin as an input
//Setup Filter Outputs
pinMode(4, OUTPUT); //Initiates off pin
pinMode(5, OUTPUT); //Initiates 1.5Khz pin
pinMode(6, OUTPUT); //Initiates 2.0Khz pin
pinMode(7, OUTPUT); //Initiates 2.5Khz pin
}
void loop() {
// check the status of the switch
switchState = digitalRead(switchPin);
// compare the switchState to its previous state
if (switchState != prevSwitchState) {
if (switchState == LOW) {
buttonPushCounter ++;
buttonPushCounter %= 4;
lcd.clear(); // clean up the screen before printing
lcd.setCursor(0, 0);
switch (buttonPushCounter)
{
case 0:
lcd.print("Off");
//delay(3000);
digitalWrite(4, HIGH); //Output on
digitalWrite(5, LOW); //Output off
//delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, LOW); //Output off
break;
case 1:
lcd.print("1.5Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, HIGH); //Output on
// delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, LOW); //Output off
break;
case 2:
lcd.print("2.0Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, LOW); //Output off
// delay(1000);
digitalWrite(6, HIGH); //Output on
digitalWrite(7, LOW); //Output off
break;
case 3:
lcd.print("2.5Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, LOW); //Output off
// delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, HIGH); //Output on
break;
}
}
}
prevSwitchState = switchState; // save the current switch state as the last state
}
The thing is i don't know what needs to be moved to where
// compare the switchState to its previous state
if (switchState != prevSwitchState) {
So, this is the start of the code that detects whether a switch has changed state. If you put the { on a new line, and used Tools + Auto Format, the { might move around. But, there will be one later in the code that lines up with it, and marks the end of the "if a switch state change occurred" block.
Inside that block, you have some code that does something useful when buttonPushCounter is 0, 1, 2, etc.
Move that code (assuming that you can recognize it) AFTER the end of the "if a switch state change occurred" block.
The code to do something useful when buttonPushCounter is 0, 1, 2, etc. should not rely on the switch becoming pressed. The only thing that should rely on the switch becoming pressed is incrementing buttonPushCounter.
Hi
To find the { at the end of the loop, i put mouse cursor at the { just below if (switchState != prevSwitchState), and found a { that was highlighted,
is that the end of the "if a switch state change occurred" block??
I don't think that it is the case code ?
having probs recognising it.
if (switchState == LOW) {
buttonPushCounter ++;
buttonPushCounter %= 4;
lcd.clear(); // clean up the screen before printing
lcd.setCursor(0, 0);
switch (buttonPushCounter)
{
case 0:
lcd.print("Off");
//delay(3000);
digitalWrite(4, HIGH); //Output on
digitalWrite(5, LOW); //Output off
//delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, LOW); //Output off
break;
case 1:
lcd.print("1.5Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, HIGH); //Output on
// delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, LOW); //Output off
break;
case 2:
lcd.print("2.0Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, LOW); //Output off
// delay(1000);
digitalWrite(6, HIGH); //Output on
digitalWrite(7, LOW); //Output off
break;
case 3:
lcd.print("2.5Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, LOW); //Output off
// delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, HIGH); //Output on
break;
to here last breakbreak;
go here
}
}
}// this is the end of the "if a switch state change occurred" block??
//go here ??
prevSwitchState = switchState; // save the current switch state as the last state
}
//ssb audio filter button
#include <LiquidCrystal.h>
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);
const int switchPin = 2; // set up a constant for the switchPin
int switchState = 0; // variable to hold the value of the switchPin
int prevSwitchState = 0; // variable to hold previous value of the switchpin
int buttonPushCounter = -1; // counter for the number of button presses
void setup() {
lcd.begin(16, 2); // set up the number of columns and rows on the LCD
pinMode(switchPin,INPUT); // set up the switch pin as an input
//Setup Filter Outputs
pinMode(4, OUTPUT); //Initiates off pin
pinMode(5, OUTPUT); //Initiates 1.5Khz pin
pinMode(6, OUTPUT); //Initiates 2.0Khz pin
pinMode(7, OUTPUT); //Initiates 2.5Khz pin
}
void loop() {
// check the status of the switch
switchState = digitalRead(switchPin);
// compare the switchState to its previous state
if (switchState != prevSwitchState)
{
if (switchState == LOW) {
}
}
}
buttonPushCounter ++; //go here ??
buttonPushCounter %= 4;
lcd.clear(); // clean up the screen before printing
lcd.setCursor(0, 0);
switch (buttonPushCounter)
{
case 0:
lcd.print("Off");
//delay(3000);
digitalWrite(4, HIGH); //Output on
digitalWrite(5, LOW); //Output off
//delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, LOW); //Output off
break;
case 1:
lcd.print("1.5Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, HIGH); //Output on
// delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, LOW); //Output off
break;
case 2:
lcd.print("2.0Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, LOW); //Output off
// delay(1000);
digitalWrite(6, HIGH); //Output on
digitalWrite(7, LOW); //Output off
break;
case 3:
lcd.print("2.5Khz");
//delay(3000);
digitalWrite(4, LOW); //Output off
digitalWrite(5, LOW); //Output off
// delay(1000);
digitalWrite(6, LOW); //Output off
digitalWrite(7, HIGH); //Output on
break;//go here ??
prevSwitchState = switchState; // save the current switch state as the last state
}
But it has errors!!
(how do i copy\paste the error codes from the bottom window of the sketch to here ?)
