Inputronic Keyboard - Live typing to Serial

Overview

This example demonstrates live typing using the Inputronic Keyboard with output to the Serial Monitor. Characters are printed in real-time as you type, making this ideal for terminal-style input and debugging.

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Initialization

Include the library, create the keyboard object, and initialize it. If the keyboard isn't found, the program halts.

#include <Arduino.h>
#include "SOLDERED-Inputronic-Keyboard.h"

InputronicKeyboard kbd;

void setup(){
    Serial.begin(115200);

    if(!kbd.begin()){
        Serial.println("Keyboard not found!");
        while(1);
    }

    Serial.println("Start typing:");
}

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Handling Special Keys

Inside the main loop, after reading each key event with readMappedEvent(), special keys are handled by comparing the label string. Release events and modifier-only keys (CAPS, SHIFT) are skipped.

if(!strcmp(label, "SPACE")){
    Serial.print(' ');
    continue;
}

if(!strcmp(label, "BACK")){
    Serial.print("\b \b");
    continue;
}

if(!strcmp(label, "ENTER")){
    Serial.println();
    continue;
}

// CAPS and SHIFT are modifiers only
if(!strcmp(label, "CAPS") || !strcmp(label, "SHIFT"))
    continue;

Key Behavior

Key	Action
Printable keys	Printed to Serial
SPACE	Prints space character
BACK	Terminal-style backspace (\b \b)
ENTER	Prints newline
CAPS	Toggles upper/lower keymap (internal)
SHIFT	Modifier (handled automatically)

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Printing Characters

For all remaining keys, labelToChar() converts the label to a printable character with SHIFT applied automatically, and prints it to the Serial Monitor.

char ch;
if(kbd.labelToChar(label, ch, true)){
    Serial.print(ch);
}

kbd.labelToChar(label, ch, applyShift)

Converts a single-character label to a printable character. Automatically applies SHIFT and CAPS logic.

Returns value: Boolean value. True if the label is a printable character.

Function parameters:

Type	Name	Description
const char*	label	Input: key label from keymap
char&	ch	Output: resulting character
bool	applyShift	Whether to apply SHIFT transformations (default: true)

ℹ️

SHIFT and CAPS logic is handled internally by the library. When SHIFT is held:

• Letters have their case inverted (CAPS XOR SHIFT)
• Numbers and symbols use the shift map (e.g., '1' becomes '!')

Live typing output in Serial Monitor

Full Example

SerialType

Demonstrates live typing with the Inputronic Keyboard, printing characters to the Serial Monitor in real-time with support for SPACE, BACK, ENTER, SHIFT, and CAPS keys.