Projects

(This page is a work in progress) I’ve built several pieces of software.

screenshot of blockchain slides screenshot of blockchain slides screenshot of blockchain slides

Blockchain train diorama (Blocktrain)

June 2018 – Aug 2018

Tech stack: Hyperledger Fabric/Composer, Node.js, JavaScript

I conceptualised and led a project that persuades industry leaders to adopt blockchain in their companies, after obtaining buy-in from senior management. I developed a fully-automated blockchain solution for supply chain management.

The project showcases how blockchain technology can be adopted in the supply chain. To this end, I’ve built an automated train diorama, and three other components:

  1. Model train diorama with IoT sensors (to showcase the system in action)
  2. Blockchain (powered by Hyperledger)
  3. Real-time blockchain visualisation
  4. Asset tracker (good viewer) that works on any mobile device

Here’s how it works. On the train are shipping containers with QR codes pasted on them. Scanning each QR code will pull up the asset tracker, a webpage that gives the real-time location and previous provenance of the good — all stored immutably on the blockchain. As the train pulls up to a station, the goods are unloaded and sent to a different location (absent a robotic arm, I’m afraid one has to use his imagination for this). When this happens, each shipping container will update its location automatically, and this is stored, once again, on the blockchain. I’ve also built a blockchain visualisation so we can see new blocks being added in real-time.

I’ve written a more extensive writeup about the project here, where I go into further detail.

Built with Hyperledger, Node.js, and HTML Canvas.

example report

Inspector’s Gadget

August 2017

Inspector’s Gadget is a bespoke desktop application written in ElectronJS that was custom-built for a civil engineering consulting firm. It streamlines the process of writing building inspection reports. Real-world usage reports show that it decreases the time taken to write a report by up to 85%.

A building inspection report involves three things:

A building inspection report is done as follows: An engineer walks around the building and takes photos of all structural features and defects (if any). The engineer will then “tag” the floor plan—put labels on the floor plan to show where each photo was taken. Finally, the engineer will produce a PDF report which includes all the photos taken, a description of each photo, and a classification of the defect type.

Before I created this application for the firm, creating a report was a very time-consuming process. First, every photo taken was renamed in File Explorer. Then, the floor plan was tagged in Microsoft Word by manually creating Text Boxes and moving them to the desired spot. Finally, to generate the report, the engineers would paste the images one by one into the Word document. God forbid the engineer missed out one photo in the middle, as to insert the new photo all subsequent photos had to be cut-and-pasted one box down. (You can see an example in the image: the image A2-30 has been left out. That means all the images and text from A2-31 onwards have to be cut and pasted one box down to make space for the new image.)

This application streamlines every part of the process, from uploading images to quick-tagging floor plans to the final report generation. Just click an area of the floor plan to tag it. The report is generated automatically, and if you missed out a photo, that’s fine—the report will reflow seamlessly.

GitHub

screenshot of form emailer screenshot of form letterer

Form Emailer and Form Letterer

April 2017

A mini “software suite” that makes sending mass, personalised emails very simple. I created it because I was too lazy to send emails manually when I was an intern. It was written in Python with the help of python-docx.

Form Letterer allows you to quickly generate Word documents from a template, (e.g. documents with different names/dates/amounts), while Form Emailer lets you send personalised emails with different files attached. They synergise as you can use Form Letterer to generate unique documents and then send those documents in personalised emails with Form Emailer.

One of the “killer features” this software suite has is the ability to send unique attachments (a different attachment to each recipient), which Outlook Mail Merge lacked. Another cool feature is it supports arbitrary Python code in substitutions, which allows for amazing substitutions Mail Merge just can’t support like conditional execution.

Form Letterer GitHub
Form Emailer GitHub

screencap of automated transaction tracker

Automated Transaction Tracker

August 2016

This was the army’s first item tracker and automatic SMS reminder system. It’s written in React, Node.js, and uses MongoDB on the back end. The system decreases administrative overhead by automatically keeping count of all items in the store (item tracker), and sending SMSes to remind borrowers who have borrowed items from the store but have not returned them in time. The system will also automatically notify the supervisor of the store so that appropriate disciplinary action can be taken.

This system won second prize in the Army’s Annual Innovation Contest.

GitHub

Games

I’ve also built some silly games.

screenshot of phonics game

Phonics Game

July 2018

An educational game for kids aged 7-8 to learn “vowel teams”, made for the Ministry of Education. I didn’t know what a vowel team was until I started this project.

Built with HTML Canvas and JavaScript, with art from the (extremely) talented Shan Wei. Available to play here.

screenshot of dropship chess

Dropship Chess

September 2017

A game built for the the Jack computer, a computer we build ourselves from scratch (NAND gates) as part of the (excellent) course From NAND to Tetris.

It’s chess played on a 6x6 board where captured enemy pieces can be “airdropped” anywhere on the board in lieu of moving a piece, kind of like Shogi/Bughouse. White starts with two knights and Black with two bishops—so you have to capture the opponent’s knights/bishops to get your own.

NAND To Tetris is an excellent overview of computer architecture. You start with a NAND gate and build full adders and mutliplexers from it. You then build basic processing and storage devices (ALU, RAM , CPU, display). Then you build an assembler, then a VM, then an interpreter, then a full-fledged parser/lexer and compiler for a high level language called Jack, and finally you write the OS for the computer in Jack! At the end of the course you’ve built a computer which supports a high-level language and can run a highly nontrivial program (Tetris) starting only from NAND gates. Awesome!

Dropship Chess, NAND 2 Tetris