Wireless Power Only

A battery in the gun with data still on a cable, or the reverse: what it buys and what it costs.

Firearms

Wireless Power Only · Deep Dive

Wireless Power Only

Half a cable.

A battery in the gun with data still on a cable, or the reverse: what it buys and what it costs.

Photo: Adafruit magnetic right-angle USB Type-C adapter (product 5521), a quick-detach magnetic connector for a USB lead by Adafruit

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Whole deep dives are listed first, then the pages inside them.

    Volumes

    1. Vol 1 The Wireless-Power-Only Gun — A Battery Inside, a Thin USB Lead Out What the architecture is, the block diagram from the PC to the coil, which side powers what, the battery magazine that makes it a swappable module, and what changes against the wired gun
    2. Vol 2 The USB Lead — Thin, Flexible, and Nothing but Data and 5 V What the lead carries, how thin it can be, how long, how many flexes it will survive, where it leaves the gun, and whether a magnetic breakaway belongs on it
    3. Vol 3 Two Sources, One Gun — Logic Power, Back-Feeding and Ground Which source powers the Pico and why, what the USB specification forbids a battery-powered device to do, what the stock RP2040 driver does anyway, ideal-diode ORing with part numbers, a rail that switches on with the cable, and where the pulse current goes
    4. Vol 4 Power Budget, Runtime, Charging and Latency What each side of the gun draws, how long one small pack lasts with the logic on USB, what a gun left plugged into nothing does to its pack, why the pack is not charged from the USB port while playing, and why the latency is the wired gun's
    5. Vol 5 Cost, When It Wins, the Bench and the Decisions What the battery magazine and its lead cost against the wired gun's umbilical, when wireless power only beats fully wired and fully wireless and when it does not, the bench tests that prove it, and the rows proposed for the decision log