CIRCUITS & ELECTRONICS DESIGN
This project involves building an LED matrix that responds to sounds and music using 4 band pass filters. It was an interesting project that was part of an Electrical Engineering class.
DRAWING OUT THE PLAN
This circuit used 4 bypass filters that cut off in different frequency ranges.
CONFIGURING THE INITIAL CIRCUIT
Working with a protoboard and soldering LEDs, nMOS and pMOS transistors
Building the circuit prototype
After writing some code for the Arduino (ESP32), we repeatedly tested the band pass filters and adjusted the threshold values on the code to match those created by the resistors.
Here’s Bohemian Rhapsody!
Wiring it to a larger LED panel
We used the same initial setup to expand this concept to a much larger LED that had an RGB color gamut.
FEA and Testing Deflection
Designing a bracket to resist deflection under multi-axial loads.
IDEATION AND DESIGN V1
We were tasked with designing a bracket to hold cylindrical apparatus for a desktop CNC.
Our main design goal was to stay within dimensional constraints while minimizing deflection in x, y and z. We also had to minimize the mass of the bracket.
Iteration 1 had the following key features:
1. Ribbed walls emulated I-Beams and reduced material along the flanks.
2. A gap on the front allows for a tight fit on the bracket when screwed in.
3. Sloping contours along the front to minimize material, this follows the concept of a tapered beam, as the bending moment is minimal at the end.
3D printing (SLA) in Nylon 12
In all the FEA we entered estimated values for the yield strength and Young’s modulus of performance grade Nylon. To best emulate the real bracket.
Predicted vs Actual Deflections
Although out simulation predicted a deflection of 0.75mm, our actual deflection was 1.1mm, which meant we either didn’t clamp it in place right or there were some inaccuracies in the material attributes.
BRACKET DESIGN V2
Update: Our bracket met the design goals, so out next iteration focused on minimizing weight and reducing material.
1. V2 had more accentuated curved that shaved off more material
2. We created pockets at the base and at the bottom to remove more material.
3. We added a vertical pillar along the flank to support the larger ribs.
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