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  • Author Author: zst123
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Name Badge Lanyard

zst123

Inspiration

Not too long ago, I came across the the #BadgeLife trend. People would make PCB into artistic badges.

 

They will design with different shapes like cartoon characters. I was inspired by these and always wanted to make a badge for myself.

 

This is an example of a badge in Defcon.

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Project Introduction

When I saw this contest, I feel it came at the right time.

I first thought of this project a few months ago, when my country was in lockdown due to the virus pandemic. Due to shipping delays, I was only able to get all the components and complete the programming a few weeks ago.

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My project is a PCB badge to be worn with a lanyard. It is meant to be a conversation starter during interviews or events. Importantly, it has the outline of my name as the shape of the board.

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The heart of the circuit is an STM32F103RE IC chip

In the middle, I added a 12x8 LED matrix. There is also an ADXL345 accelerometer and a Bluetooth module too.

 

Design

The design is made using EAGLE PCB software. I simply added a large text and then traced out my name on the board outline.

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Manufacturing

 

I sent the Gerber files to JLCPCB. I ordered 10 boards buy they sent me 12 boards. Price was cheap for about USD15 inclusive of shipping.

 

The outline of my name is very clean and I am impressed that they manufactured it so well.

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Soldering

 

I have experience in soldering 0805 SMD before. So for this project I decided to try 0603 SMD for all the passives.

 

But the difficulty was the SMD LEDs. The LEDs were made of plastic casing so if I wasn't careful, I will melt the casing and spoilt the LED. I did not have any solder paste around so I could not do reflowing. I spent the most time on careful soldering all 96 LEDs (12x8 matrix)

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Programming

I connected ST-Link programmer from a Nucleo board using breadboard wires. I programmed it using STM32 Cube IDE.

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So far I have gotten the accelerometer and LED matrix working, which I will show in the video below.

 

I have not gotten the Bluetooth reliably. I chose the JDY-10 module from eBay to keep costs low. This is because I realised the module uses Bluetooth Low-Energy (BLE) which my PC doesn't support.

 

My phone happens to supports BLE so I may have to code an app for it later on. My plan is to show patterns or text controlled via the Bluetooth app. I do not have much experience in BLE, hopefully, it is not too different.

 

Video Demo

 

The first video is testing the accelerometer. It moves a dot around the screen.

 

This next video is trying out a "water" mode. It looks like water moving around a cup.

 

This last video, I made a game. This is a replication of doodle jump.

 

Photoshoot

 

And lastly, this is PCB Art, so we need a professional photoshoot.

 

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