Grandmother's Quilt (Smart Irregular Patchwork Area & Grid Scanner)
Source: Stemoto Original
Design a patchwork quilt out of irregular fabric pieces. Place quilt shapes onto a 1-cm transparent grid scanner; optical sensors count full, half, and partial grid squares to compute total fabric surface area.
Categorisation
Props & Materials Required
- •1-cm transparent grid lightbox scanner board
- •Assorted patchwork fabric shapes (Triangles, L-shapes, Leaves, Star patches)
- •Optical light sensor grid array / camera scanner
- •ESP32 controller board
- •0.96-inch OLED display screen
- •DFPlayer Mini MP3 module + 3W speaker
Step-by-Step Instructions
Place Irregular Fabric Patch
Place an irregular leaf-shaped fabric patch on the 1-cm grid lightbox.
Optical Grid Scan
Light sensors scan grid squares covered by fabric.
Count Full & Half Squares
Controller counts: 18 Full Squares + 6 Half Squares (3) = 21 sq cm total.
Area Result & Quilt Assembly
OLED displays 'Estimated Patch Area: 21 sq cm'. Speaker celebrates: 'Quilt patch area verified! Sew into Grandmother's Quilt!'
Why It Works & Notes
Grandmother's Quilt teaches finding the area of irregular non-rectangular shapes by counting full squares, half squares (>1/2 = 1, <1/2 = 0). Using an optical grid scanner turns grid square estimation into computer vision math.
Maths Mela Class 5 Chapter 11: Grandmother's Quilt | STEM Tech: Optical Pixel Area Integration & Grid Square Quantization — GIS satellite land cover area measurement.