再会！我真的不知道如何提出正确的问题，但我会尝试彻底解释这种情况。
我试图为安卓手机制作一个 12 键键盘，我使用了迷你克隆版的 arduino Atmeg168、一个 3x4 键盘和一个蓝牙屏蔽，老实说，我还没有真正成功地显示所有的字母。我正在使用一个名为蓝牙 SPP 的 Android 应用程序来接收蓝牙传输的串行数据，我想要实现的是能够将字符或发送到 android 文本框的字符发送到文本框。可能吗？这是我一直在使用的代码
#include <Keypad.h>
#include <SoftwareSerial.h>
#include <ctype.h>
SoftwareSerial mySerial(2, 3);
const byte ROWS = 4;
const byte COLS = 3;
int digitsEntered = 0; //number of digits entered
char alphaKeys[ROWS][COLS] = {
{ '.','a','d' },
{ 'g','j','m' },
{ 'p','t','w' },
{ '*',' ','#' }
};
char alpha2Keys[ROWS][COLS] = {
{ ',','b','e' },
{ 'h','k','n' },
{ 'q','u','x' },
{ '*','s','#' }
};
char alpha3Keys[ROWS][COLS] = {
{ '?','c','f' },
{ 'i','l','o' },
{ 'r','v','y' },
{ '*','z','#' }
};
char numberKeys[ROWS][COLS] = {
{ '1','2','3' },
{ '4','5','6' },
{ '7','8','9' },
{ '*','0','#' }
};
boolean alpha = false;
boolean alpha2 = false;
boolean alpha3 = false;
byte rowPins[ROWS] = { 5, 10, 9, 7 };
byte colPins[COLS] = {6, 4, 8 };
Keypad numpad( makeKeymap(numberKeys), rowPins, colPins, sizeof(rowPins), sizeof(colPins) );
Keypad ltrpad( makeKeymap(alphaKeys), rowPins, colPins, sizeof(rowPins), sizeof(colPins) );
Keypad ltr( makeKeymap(alpha2Keys), rowPins, colPins, sizeof(rowPins), sizeof(colPins) );
Keypad letters( makeKeymap(alpha3Keys), rowPins, colPins, sizeof(rowPins), sizeof(colPins) );
unsigned long startTime;
const byte ledPin = 13;
const byte led = 12;
void setup() {
pinMode (4, INPUT);//Column 1
pinMode (6, INPUT);//Column 2
pinMode (8, INPUT);//Column 3
digitalWrite(4, HIGH);//Pull up resistor of Arduino
digitalWrite(6, HIGH);// Pull up resistor of Arduino
digitalWrite(8, HIGH);// Pull up resistor of Arduino
Serial.begin(9600);
Serial.println("Testing....");
mySerial.begin(9600);
mySerial.println("Successful!");
pinMode(ledPin, OUTPUT);
pinMode(led, OUTPUT);
digitalWrite(ledPin, LOW);
ltr.begin( makeKeymap(alpha2Keys) );
letters.begin( makeKeymap(alpha3Keys) );
ltrpad.begin( makeKeymap(alphaKeys) );
numpad.begin( makeKeymap(numberKeys) );
letters.addEventListener(keypadEvent_ltr3);
ltr.addEventListener(keypadEvent_ltr2);
ltrpad.addEventListener(keypadEvent_ltr);
letters.setHoldTime(300);
ltr.setHoldTime(300);
ltrpad.setHoldTime(300);
numpad.addEventListener(keypadEvent_num);
numpad.setHoldTime(300);
}
char key;
void loop() {
if( alpha )
key = ltrpad.getKey( );
else if( alpha2 )
key = ltr.getKey( );
else if( alpha3 )
key = letters.getKey( );
else
key = numpad.getKey( );
if (alpha && millis()-startTime>100) {
digitalWrite(ledPin,!digitalRead(ledPin));
startTime = millis();
}
else if (alpha2 && millis()-startTime>100) {
digitalWrite(ledPin,!digitalRead(ledPin));
startTime = millis();
}
else if (alpha3 && millis()-startTime>100) {
digitalWrite(ledPin,!digitalRead(ledPin));
startTime = millis();
}
if (key != NO_KEY)
{
digitsEntered++;
mySerial.begin(9600);
mySerial.print(key);
delay(100);
}
}
static char virtKey = NO_KEY;
static char physKey = NO_KEY;
static char buildStr[12];
static byte buildCount;
static byte pressCount;
static byte kpadState;
void keypadEvent_ltr(KeypadEvent key) {
kpadState = ltrpad.getState( );
swOnState( key );
}
void keypadEvent_ltr2(KeypadEvent key) {
kpadState = ltr.getState( );
swOnState( key );
}
void keypadEvent_num( KeypadEvent key ) {
kpadState = numpad.getState( );
swOnState( key );
}
void keypadEvent_ltr3(KeypadEvent key) {
kpadState = letters.getState( );
swOnState( key );
}
void swOnState( char key ) {
switch( kpadState ) {
case PRESSED:
if (isalpha(key)) {
if (physKey != key) {
pressCount = 0;
virtKey = key;
physKey = key;
}
else {
virtKey++;
pressCount++;
}
if (pressCount > 2) {
pressCount = 0;
virtKey = key;
}
Serial.print(virtKey);
}
if (isdigit(key) || key == ' ' || key == '.')
Serial.print(key);
if (key == '#')
Serial.println();
case HOLD:
if (key == '#') {
if (alpha == true) {
alpha = false;
digitalWrite(ledPin, LOW);
digitalWrite(led, LOW);
}
else {
alpha = true;
}
}
else if (key == '*') {
if (alpha2 == true) {
alpha2 = false;
digitalWrite(ledPin, HIGH);
digitalWrite(led, HIGH);
}
else {
alpha2 = true;
}
}
else if (key == '*') {
if (alpha3 == true) {
alpha3 = false;
digitalWrite(ledPin, HIGH);
digitalWrite(led, HIGH);
}
else {
alpha3 = true;
}
}
else {
buildStr[buildCount++] = (isalpha(key)) ? virtKey : key;
buildStr[buildCount] = '\0';
Serial.println();
Serial.println(buildStr);
}
break;
case RELEASED:
if (buildCount >= sizeof(buildStr)) buildCount = 0;
break;
}
}
还有一种方法可以通过电话将arduino识别为键盘吗？