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Decoration for Festival (Smart LED Garland Addition & Subtraction)

Source:

Design a festive festival flower garland with a NeoPixel LED light string. Children punch addition/subtraction problems on a keypad pad, and the exact number of LEDs light up in festive color patterns.

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Props & Materials Required

  • •Craft garland string with paper flowers
  • •30-LED NeoPixel addressable strip (WS2812B)
  • •ESP32 controller board
  • •4x4 membrane numeric keypad
  • •DFPlayer Mini MP3 module + 3W speaker

Step-by-Step Instructions

1

Punch the Problem

Key in an addition problem on the keypad: e.g., '24 + 15'.

2

Watch the Garland Light Up

24 yellow flower LEDs light up first, then 15 blue flower LEDs light up next to them along the string.

3

Count the Total

Count all lit LEDs together. The digital display and speaker confirm: '24 plus 15 equals 39 festival lights!'

4

Subtraction Light Removal

For '35 - 12', 35 lights turn ON, then 12 lights turn OFF one-by-one with popping sounds. Speaker announces: '23 lights remain!'

Why It Works & Notes

Festival decoration themes (diya lights, flower garlands) contextualize 2-digit addition and subtraction. Seeing LED bulbs light up one-by-one along a garland visually represents 2-digit sums concrete and beautiful.