Raksha Bandhan (Smart Rakhi Bead Multiplication Matrix)
Source:
Decorate Rakhis by arranging beads on a 10x10 grid matrix board. Magnetic Hall-effect sensors under the grid detect the row x column array (e.g. 4 rows of 6 beads) and display multiplication tables with sound.
Categorisation
Props & Materials Required
- •10x10 magnetic pegboard grid
- •Magnetic decorative Rakhi beads (40 items)
- •100x Hall-effect / reed switch matrix array or row/column touch grid
- •ESP32 controller board
- •0.96-inch OLED display
- •DFPlayer Mini MP3 module + 3W speaker
Step-by-Step Instructions
1
Set Up Rakhi Array
Place beads to make 4 rows with 6 beads in each row on the grid.
2
Smart Grid Matrix Scan
Grid sensors scan the array: 4 Rows × 6 Columns.
3
Multiplication Table Announcement
OLED displays '4 × 6 = 24'. Speaker narrates: '4 groups of 6 beads equals 24 total beads! 4 times 6 is 24!'
4
Commutative Property Test
Rotate the board 90° to make 6 rows of 4 beads. Grid confirms: '6 × 4 = 24! The total stays the SAME!'
Why It Works & Notes
Multiplication tables are easily memorized when visualized as 2D rectangular arrays (rows × columns). Building a 4x6 Rakhi bead array on a smart grid shows that 4 rows of 6 beads equals 24 total beads.