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@anekos /sketch.ino
Last active Aug 26, 2018

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静電タッチキーボード TTP229用のコード
/**
* Original code: http://forum.hobbycomponents.com/viewtopic.php?f=73&t=1781
*
*
* This is an example of how to use the Hobby Components 16 key capacitive touch
* keypad (HCMODU0079). This example sketch will read the current state of the
* of the keypad and if a key is pressed output its key number to the serial port.
*
* The sketch assumes that the keypad is configured to 16 key active low mode
* by shorting pads P1-3 and P1-P4 together (see schematic or sport forum for more
* information). Connect the keypad to your Arduino as follows:
*
* Keypad......Arduino
* VCC.........+5V
* GND.........GND
* SCL.........Digital pin 8
* SDO.........Digital pin 9
*
* You may copy, alter and reuse this code in any way you like, but please leave
* reference to HobbyComponents.com in your comments if you redistribute this code.
*
* This software may not be used directly for the purpose of promoting products that
* directly compete with Hobby Components Ltd's own range of products.
*
* THIS SOFTWARE IS PROVIDED "AS IS". HOBBY COMPONENTS MAKES NO WARRANTIES,
* WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ACCURACY OR
* LACK OF NEGLIGENCE. HOBBY COMPONENTS SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE
* FOR ANY DAMAGES INCLUDING, BUT NOT LIMITED TO, SPECIAL, INCIDENTAL OR
* CONSEQUENTIAL DAMAGES FOR ANY REASON WHATSOEVER.
*/
#include "Keyboard.h"
/* Define the digital pins used for the clock and data */
#define SCL_PIN 8
#define SDO_PIN 9
void setup()
{
Keyboard.begin();
/* Configure the clock and data pins */
pinMode(SCL_PIN, OUTPUT);
pinMode(SDO_PIN, INPUT);
}
byte prev = 0;
/* Main program */
void loop()
{
/* Read the current state of the keypad */
byte now = Read_Keypad();
/* If a key has been pressed output it to the serial port */
if ((now != prev) && now) {
Keyboard.write('a' + now);
}
prev = now;
}
/* Read the state of the keypad */
byte Read_Keypad(void)
{
byte Count;
byte Key_State = 0;
/* Pulse the clock pin 16 times (one for each key of the keypad)
and read the state of the data pin on each pulse */
for(Count = 1; Count <= 16; Count++)
{
digitalWrite(SCL_PIN, LOW);
/* If the data pin is low (active low mode) then store the
current key number */
if (!digitalRead(SDO_PIN))
Key_State = Count;
digitalWrite(SCL_PIN, HIGH);
}
return Key_State;
}
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