64 lines
1.9 KiB
C++
Executable File
64 lines
1.9 KiB
C++
Executable File
/*
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ReadKeypad.ino - Arduino library for I2C LCD03 display from Robot Electronics
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see http://www.robot-electronics.co.uk/htm/Lcd03tech.htm
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Copyright (c) 2013 Ben Arblaster. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <Wire.h>
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#include <LCD03.h>
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// Create new LCD03 instance
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LCD03 lcd;
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uint16_t keystate;
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void setup() {
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// Initialise a 20x4 LCD
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lcd.begin(20, 4);
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}
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// Check they keypad state once a second and print to the LCD
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void loop() {
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// Clear the display and move the cursor to the top-left
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lcd.clear();
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// Read the keypad state
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keystate = lcd.readKeypad();
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// Check if key 1 is pressed
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if(keystate & KEYPAD_1 == KEYPAD_1) {
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lcd.print("Key 1 is pressed!");
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}
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// Check if key 1 is pressed exclusively
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if(keystate == KEYPAD_1) {
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lcd.print("Only key 1 is pressed!");
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}
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// Check if keys 1 and * are pressed simultaneously
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if(keystate & (KEYPAD_1 | KEYPAD_STAR) == (KEYPAD_1 | KEYPAD_2)) {
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lcd.print("Keys 1 and * are pressed!");
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}
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// Check if keys 1 and * are pressed simultaneously exclusively
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if(keystate == (KEYPAD_1 | KEYPAD_STAR)) {
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lcd.print("Only keys 1 and * are pressed!");
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}
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// Wait for 1 second
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delay(1000);
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}
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