I came around a little problem while working on my project.
I tried to read a 4x3 matrix but i can't seem to get it working with a analog pin.
Does anyone have the code and solution to this problem would be nice.
Kind regards Wouter
woujer:
I came around a little problem while working on my project.
I tried to read a 4x3 matrix but i can't seem to get it working with a analog pin.
Does anyone have the code and solution to this problem would be nice.Kind regards Wouter
What matrix?
A keyboard matrix?
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Can you post your code please?
Tom... 
TomGeorge:
What matrix?
A keyboard matrix?
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Can you post your code please?
Tom...
Nothing super special of a circuit atm. I'm using a arduino UNO and a simple 4x3 keyboard matrix.
I'm still searching for a circuit i can use to fix this. anyway here is the code i used atm.
#include <Key.h>
#include <Keypad.h>
#include <LCD.h>
#include <LiquidCrystal.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Set the LCD I2C address
int keys[] ={ //Stores total keypad input
1, 2, 3, 4, 5, 6, 7, 8, 9, -3, 0, -2}; //"123456789*0#";
int key; //Stores most recent key pressed
boolean key_lockout=false;
int order[4];
int value=0;
//Initialize
const int vodka=3;
const int gin=4; //Based on 12v black pumps, 25.3 sec/oz (38 sec/1.5 oz)
const int whiskey=5;
const int tripleSec=6;
const int tequila=7;
const int rum=8;
const int water=9;
const int siroop=10;
void setup(){
Serial.begin(9600);
lcd.begin(16,2);
pinMode(vodka, OUTPUT);
pinMode(gin, OUTPUT);
pinMode(whiskey, OUTPUT);
pinMode(tripleSec, OUTPUT);
pinMode(tequila, OUTPUT);
pinMode(rum, OUTPUT);
pinMode(siroop, OUTPUT);
pinMode(water, OUTPUT);
digitalWrite(vodka, HIGH);
digitalWrite(gin, HIGH);
digitalWrite(whiskey, HIGH);
digitalWrite(tripleSec, HIGH);
digitalWrite(tequila, HIGH);
digitalWrite(rum, HIGH);
digitalWrite(siroop, HIGH);
digitalWrite(water, HIGH);
// ------- 3 blinks of backlight -------------
for(int i = 0; i< 3; i++)
{
lcd.print("Even gedult...");
lcd.backlight();
delay(250);
lcd.noBacklight();
delay(250);
lcd.clear();
}
lcd.backlight();
}
void loop(){
Beginning:
{
//-------- Start/keuze scherm ------------------------------
lcd.clear();
lcd.setCursor(0,0); //Start at character 4 on line 0
lcd.print("Whats your order?");
delay(500);
lcd.setCursor(0,1);
lcd.print(" *=Del, #=Enter");
delay(1000);
//-----------------------------------------------------------
value=0;
for (int x=0; x<3; x++){
key=getKeypad(); //Get key pressed
if(key==-1){ //If valid key not pressed restart iteration
x=x-1;
}
else{
if(key!=14 && key!=12){ //If not CLEAR or ENTER
value = (10*(value)) + (keys[key]);
delay(10);
lcd.clear();
lcd.setCursor(0,0); //Start at character 4 on line 0
lcd.print("Item #");
delay(10);
lcd.setCursor(6,0);
lcd.print(value);
delay(500);
}
else if(key==14){ //If ENTER, exit
x=4;
}
else if (key==12){ //If CLEAR, restart
x=-1;
}
}
}
lcd.clear();
lcd.setCursor(0,0);
lcd.print(" Press # to");
delay(10);
lcd.setCursor(0,1);
lcd.print("Confirm drink");
delay(10);
lcd.setCursor(14,1);
lcd.print(value);
do{
key=getKeypad();
}
while(key!=12 && key!=14);
if(key==12){ //Restart ordering process
goto Beginning; //Return to the beginning of loop()
}
else if(key==14){
lcd.clear();
lcd.setCursor(0,0); //Start at character 4 on line 0
lcd.print(" Confirmed");
delay(1000);
switch (value) {
case 1:
longIslandIcedTea();
}
delay(5); // delay in between reads for stability
}
}
}
//--------Functions-----------
int getKeypad(){ //Returns which key is pressed
int ret=-1;
boolean reset_lockout=false;
if(analogRead(A0)<120)
key_lockout=false;
else if(!key_lockout){
delay(100);
ret=15.5-(log((analogRead(A0)-183.9)/58.24)/0.1623);//+0.5;
key_lockout=true;
}
return ret;
}
// Menu
//Long Island Iced Tea
int longIslandIcedTea(){
digitalWrite(vodka, LOW);
delay(80);
digitalWrite(gin, LOW);
delay(80);
digitalWrite(tripleSec, LOW);
delay(80);
//Serial.println("In the matrix");
digitalWrite(tequila, LOW);
delay(80);
digitalWrite(rum, LOW);
delay(80);
digitalWrite(water, LOW);
delay(6600);
digitalWrite(vodka, HIGH);
delay(6400);
digitalWrite(water, HIGH);
digitalWrite(gin, HIGH);
digitalWrite(tripleSec, HIGH);
digitalWrite(tequila, HIGH);
digitalWrite(rum, HIGH);
}
Can you provide a link to your keyboard? A data sheet is very helpful, but a link to where you bought it helps too.
vinceherman:
Can you provide a link to your keyboard? A data sheet is very helpful, but a link to where you bought it helps too.
Hi,
That link shows you how to connect the keyboard to the UNO.
Why are you asking about analog pin connections?
And even code...
Tom...
TomGeorge:
Hi,
That link shows you how to connect the keyboard to the UNO.
Why are you asking about analog pin connections?
And even code...Tom...
I want a 1 analog input not multi input on my UNO that's the problem
I want a 1 analog input not multi input on my UNO that's the problem
Forget that idea.
woujer:
I want a 1 analog input not multi input on my UNO that's the problem
You need to build or find an analog button pad. You have a digital key pad now.
Hi,
Change from a UNO to a MEGA, more I/O and you can then use the 3x4 digital keyboard.
Tom...
With analog buttons you have a number of buttons that connect a different resistor each to power (press one button at a time only) on one side and the analog pin and another resistor to ground forming a voltage divider. Each button press makes a different voltage on the pin, make sure none are close to any others.