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Mridang Phonics Sound Synthesizer Keyboard

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Press conductive foil piano keys corresponding to letter digraphs (SH, CH, TH, WH, AI, OU). The synthesizer board blends letter sounds together into full words with LED illuminated visual cues.

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Props & Materials Required

  • •12-key conductive touch keyboard plate (copper foil / PCB)
  • •MPR121 capacitive touch sensor board
  • •ESP32 microcontroller
  • •DFPlayer Mini MP3 module + 3W speaker
  • •12x mini color LEDs (one per key)
  • •0.96-inch OLED display

Step-by-Step Instructions

1

Touch Digraph Key

Touch the 'SH' key on the synthesizer board. Speaker plays clear phoneme: '/sh/ /sh/' while key LED glows blue.

2

Blend Word Keys

Touch 'SH' then 'I' then 'P' in fast sequence. Speaker blends them: '/sh/ - /i/ - /p/... SHIP!' OLED displays picture of a ship.

3

Rhyme Generation Game

Press 'CAT'. Speaker asks: 'Can you touch a rhyming word key?' Child touches 'MAT' → Speaker plays applause sound!

4

Record & Playback

Record child pronouncing the word, then play it back side-by-side with the smart speaker audio.

Why It Works & Notes

Phonics blending (e.g. /sh/ + /i/ + /p/ = ship) requires auditory synthesis. A touch-synthesizer keyboard where children press keys to play individual phonemes and hear them blended together builds fluent reading skills.