Background
Many weeks ago, when I tried to exit a parking lot, I was—once again—battling with technology as I tried to pay the parking fee. I opened an app and used it to scan the QR payment code on the wall, but it just wouldn’t recognize the code because it was too far away. Thankfully, a parking lot attendant came out to help me complete the payment, sparing me from the embarrassment of the cars behind me beeping their horns in frustration. This made me want to create a QR code scanning app that could save me from such future pain.
The first demo app I created was, truth to be told, a failure. First, the distance between my phone and a QR code had to be within 30 cm, otherwise the app would fail to recognize the code. However, in most cases, this distance is not ideal for a parking lot.