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Lines and Angles (Smart Servo Goniometer & Architectural Truss Tester)

Source:

Construct an architectural bridge truss frame. A SG90 servo motor goniometer arm measures internal joint angles in real time (30°, 60°, 90°, 120°), while load cell sensors demonstrate why triangular 60° trusses absorb structural stress best!

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Props & Materials Required

  • •Adjustable acrylic/wooden bridge truss frame kit
  • •SG90 micro servo motor goniometer joint sensor
  • •KY-040 rotary encoder angle sensor
  • •HX711 load cell structural force sensor
  • •ESP32 controller board
  • •16x2 LCD display screen
  • •DFPlayer Mini MP3 module + 3W speaker

Step-by-Step Instructions

1

Adjust Joint Angle to 60 Degrees

Rotate truss joint arm to 60° (Equilateral Triangle angle).

2

Goniometer Reads Exact Angle

Rotary encoder reads 'Angle: 60.0° (ACUTE ANGLE)'.

3

Apply Structural Weight Stress

Press down on truss apex. Load cell measures 2.5 kg weight distribution.

4

Structural Stability Audio Proof

LCD displays 'TRUSS RIGIDITY: MAXIMUM (60° Triangle)'. Speaker explains why crane booms and bridges use triangular angle trusses!

Why It Works & Notes

Triangular geometry is structurally rigid because internal angles cannot deform without changing side lengths. Measuring joint angles with rotary goniometers while applying weight stress proves angle geometry in civil engineering.