Custom Name

Complete technical description

This project is a modular kit to build your own name on a shared base using 3D-printable letters.
Users can print only the letters they need and insert them into the base. The letters are hollow, allowing installation of 5 mm LEDs of any color.

Key features

• Modular base with space for wiring and round coin cell batteries up to 22 mm diameter

• Optional LEDs; users can install any color

• No fixed electronics housing: users can quickly cut or modify the base as needed

• Clean, minimal design, ideal for desk or shelf decoration

• Easy assembly, fully customizable

• LED lighting works best with bright colors, single or RGB

additional code for ESP32 and Arduino

Operating instructions

• One button → toggles the LED ON/OFF (es : 3 led)

• Simple wiring between LED, resistor, and button

• Button connected to digital pin with 10 kΩ pull-down resistor

int ledPin = 6;       // LED pin (arduino)
// int ledPin = 18;   // LED pin (ESP32)
int buttonPin = 2;    // Button pin (arduino)
// int buttonPin = 19; // Button pin (ESP32)

bool lightOn = false;
bool lastButtonState = LOW; // pull-down: not pressed = LOW

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT); // external pull-down
}

void loop() {
  bool buttonState = digitalRead(buttonPin);

  if (lastButtonState == LOW && buttonState == HIGH) {
    lightOn = !lightOn;
    digitalWrite(ledPin, lightOn);
    delay(200); // simple debounce
  }

  lastButtonState = buttonState;
}

circuit connected to program
see the attached PDF

I remember the pulsed connection

+5V ----+
        |
        |   Button
        +---/ ---+
        |        |
        |        +-----> Arduino/ESP32 digital pin
        |
       10kΩ
        |
       GND

LED resistor table