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1602 LCD Module Screen Keypad Shield for Arduino Duemilanove UNO MEGA2560 MEGA1280 1602
Sample code:
/*
The circuit:
* LCD RS pin to digital pin 8
* LCD Enable pin to digital pin 9
* LCD D4 pin to digital pin 4
* LCD D5 pin to digital pin 5
* LCD D6 pin to digital pin 6
* LCD D7 pin to digital pin 7
* LCD BL pin to digital pin 10
* KEY pin to analogl pin 0
*/
#include
LiquidCrystal lcd(8, 13, 9, 4, 5, 6, 7);
char msgs[5][16] = {"Right Key OK ",
"Up Key OK ",
"Down Key OK ",
"Left Key OK ",
"Select Key OK" };
int adc_key_val[5] ={50, 200, 400, 600, 800 };
int NUM_KEYS = 5;
int adc_key_in;
int key=-1;
int oldkey=-1;
void setup()
{
lcd.clear();
lcd.begin(16, 2);
lcd.setCursor(0,0);
lcd.print("ADC key testing");
}
void loop()
{
adc_key_in = analogRead(0); // read the value from the sensor
key = get_key(adc_key_in); // convert into key press
if (key != oldkey) // if keypress is detected
{
delay(50); // wait for debounce time
adc_key_in = analogRead(0); // read the value from the sensor
key = get_key(adc_key_in); // convert into key press
if (key != oldkey)
{
lcd.setCursor(0, 1);
oldkey = key;
if (key >=0){
lcd.print(msgs[key]);
}
}
}
delay(100);
}
// Convert ADC value to key number
int get_key(unsigned int input)
{
int k;
for (k = 0; k < NUM_KEYS; k++)
{
if (input < adc_key_val[k])
{
return k;
}
}
if (k >= NUM_KEYS)k = -1; // No valid key pressed
return k;
}
Package include:
1 * 1602 LCD Module