Meet Proxio
 
Denago gave you a swipe card to start your cart. I got tired of it, so I built the ignition it should have shipped with.
 
Proxio is a fully tunable Bluetooth ignition for your Denago. It connects through a plug and play piggyback harness, meaning your factory key card stays fully functional and the whole install is completely reversible. No cutting, no splicing.
 
Everything is adjustable to fit how you actually use your cart. Signal distance, timing, colors and sound, all of it, tuned through a web app where you enroll your devices and manage settings from your phone or computer.
 
Safety was designed in from the start. A secondary solid state fail safe with an accelerometer prevents the ignition from shutting down until the cart is standing still, so it will never cut power while you're moving. And your original card stays in your wallet as a backup, so a dead phone never strands you.
 
Forget to turn the cart off? Proxio can shut it down automatically. Wondering what state it's in? A color changing LED shows your status at a quick glance. 
 
At the heart of it all is a custom PCB, purpose built for this exact project. This isn't an off the shelf module wired into your cart or a generic kit adapted to fit. Every component on the board was chosen and laid out specifically for this job, from the Bluetooth radio to the fail safe circuitry, all engineered as one cohesive system.