LCD HELP with keypad

Projects Programming
1

Hello all,

I am having trouble implementing a 4-wire sainsmart lcd2004 into my project. I have a working project without the lcd, but i need to add it in. It is due for class in a few hours, so you can imagine it is time sensitive. The LCD is 20x4. The wire inputs are VCC at Arduino VCC, ground at Arduino ground, SDA at A4, and SCL at A5. Any help would be much appreciated. Thank you!

Here is my code:

#include <LiquidCrystal.h>
#include <Servo.h>
String keys="123A456B789C*0#D";
int key;
boolean key_lockout=false;
int button1 = 7;
int press1 = 0;
int pos = 90;
int led = 8;
int led2 = 9;
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
Servo servo1;
void setup()
{
  Serial.begin(9600);

  lcd.begin(16,2);//hjhjkhhkjhkjhjhkhkjhjhjjkhjkhjhjhkhjjhkjhj
 lcd.print("Insert Passkey");  //0ohiuihkj
  pinMode(button1, INPUT);
  pinMode(led, OUTPUT);
  pinMode(led, OUTPUT);
  servo1.attach(13);
  digitalWrite(7, HIGH);
  digitalWrite(8, LOW);
  digitalWrite(9, LOW);
}

char password[]={"1234"};
char enteredString[5]={""};
int stringPos=0;


void loop(){

  key=getKeypad();
  if( (key>-1) && (keys[key]!='*') && (keys[key]!='#') )
  {
   //save current char
   enteredString[stringPos++]=keys[key];
   //terminate string
   enteredString[stringPos]=0;
   //prevent writing past end of string
   stringPos -= (stringPos > 3);
   Serial.print(keys[key]);
   lcd.print(keys[key]); //gyghgjgjhghjhhjgjhghgjhhjhjhhhhhhhh
   delay(10);
  }
  
 
 
 
  if (keys[key] =='#')
  {//reset ready for next attempt
    Serial.println("");
    stringPos=0;
    if ( strcmp(enteredString, password)==0) 
      {digitalWrite(led, HIGH);
        Serial.println("Quick, it's open");
       servo1.write(0);
       delay(5000);
       servo1.write(90);
       digitalWrite(led, LOW);
       digitalWrite(led2, HIGH);
    delay(1000);
    digitalWrite(led2, LOW);
      }
    else
    digitalWrite(led2, HIGH);
      Serial.println("GO AWAY!");
      delay(1000);
      digitalWrite(led2, LOW);
    }
    press1 = digitalRead(button1);
    if (press1==LOW)
    {
    digitalWrite(led, HIGH);
    servo1.write(0);
    delay(5000);
    servo1.write(90);
    digitalWrite(led, LOW);
    digitalWrite(led2, HIGH);
    delay(1000);
    digitalWrite(led2, LOW);
  }
      
}

int getKeypad(){
  int ret=-1;
  boolean reset_lockout=false;
  if(analogRead(A0)==0)
    key_lockout=false;
  else if(!key_lockout){
    delay(20);
    ret=15-(log((analogRead(A0)-183.9)/58.24)/0.1623)+0.5;
    key_lockout=true;
  }
  return ret;
}

Thanks again.

2

I always hate it when our assignments are due in a few hours.

How about starting by looking at the example Arduino code on the Sainsmart site
Example code

3

UKHeliBob:
I always hate it when our assignments are due in a few hours.

How about starting by looking at the example Arduino code on the Sainsmart site
Example code

Thank you for the reply (yes, it absolutely sucks. But hey, thats what procrastination gets me). I have already, and I only had luck getting it to test, but the problem is that it designates pins that it isn't using, and I am using those pins for other things. Im at a complete loss.