Mads Tech Says
The Protos Drone is a ready to fly drone kit from Caddx based around their new Walksnail Ascent Digital FPV System.
The Drone is based around PX4 flight firmware, has the Ascent Lite Digital VTX built in and uses ExpressLRS for its RC Control link.
As part of the system Caddx have included their own RC controller called A-Link, this is using a unsupported fork of ExpressLRS 3x firmware and is not endorsed or supported by the ExpressLRS project.
Caddx Protos – Caddx FPV Say
- Top Choice Protos FPV Drone RTF Kit: At just 1.6 inches and 100g, this mini FPV drone fits in your palm yet delivers stunning HD video. No FAA registration or Remote ID needed—fly it anywhere with total freedom. Pocket-sized, beginner-friendly, and powerful enough for pros
- Pro-Level Ascent HD VTX & 2MP Camera: Equipped with a 1/3-inch Starvis II sensor and 160° wide-angle lens, this drone captures crisp, detailed footage. The ultra-light 6g Ascent HD VTX delivers stable, low-latency video without extra weight
- Non-Stop Fun, Fast Charging: Enjoy over 30 minutes of flight with three 840mAh batteries, each lasting up to 10 minutes. The 3-in-1 smart charger recharges them in only 20 minutes via Type-C
- 3 Flight Modes, Endless Thrills: Choose Position Hold for smooth hovering, Self-Stabilizing for easy cruising, or Manual for freestyle tricks. Smart-hover makes control silky-smooth, while the built-in safety lock builds beginner confidence
- Immersive FPV Goggles, Sharp & Smooth: See the sky like never before with 1080P/60FPS clarity and ultra-low 35ms latency. Auto signal search locks onto the best connection instantly, while flicker-free screens reduce eye strain
- Fly Fearlessly, Crash-Resistant Design: The drone body is made from ultra-light, single-piece polymer—no seams, no weak points—for maximum strength
- Complete FPV Drone Kit: Designed for adults, teens, beginners, and hobbyists who want real FPV performance without extra setup. A fun and practical gift for drone lovers—just open, power on, and take flight
Caddx Protos Drone
The Caddx Protos Drone is base on PX4 Firmware and features optical flow built in, this allows for position hold and altitude hold as well as stabilised and Manual flight modes.
Out the box the Protos PX4 firmware is IMO badly tuned however this can be chaged with ratemode tuning via QGround Control
The Protos can also be flashed with Betaflight however you will loos Optical flow position hold modes and you may not be able to flash back,.
Drone Specification
Caddx Ascent FPV Goggles
See Specific Article Here – https://fpvwiki.co.uk/caddx-walksnail-ascent-goggles
A-Link Remote Controller
Based on a fork of ExpressLRS 3x this remote is designed to be used with the Protos drone.
2.4Ghz STM32 Based.
RC controller called A-Link, this is using a unsupported fork of ExpressLRS 3x firmware and is not endorsed or supported by the ExpressLRS project. See Review for more information.
See Ascent Goggles & Remote Teardown video for more information.
Ascent VTX In Drone
The Caddx Protos is fitted with the Ascent Lite VTX that supports upto 1080P 60FPS FPV live feed.
This is based on the Artosyn ARLink AS803X chipset and there is no DVR onboard the drone, images of this VTX will be listed at the bottom and more information can be found on the Ascent Lite VTX page here – https://fpvwiki.co.uk/caddx-walksnail-ascent-lite-vtx
Videos
Protos Drone Review
Caddx Protos Tuning – PX4
The Protos is shipped with PX4 from the factors and its setting and PID profile can be tuned in QGround Control – https://qgroundcontrol.com/
Tuning Parameters
Manual/Acro Mode Tuning Pram – Advised Values For Improvement
- MC_ACRO_EXPO – Use to reduce RC Expo, set to 0.30 Max, )(default is 0.69)
- MC_ACRO_EXPO_Y – Use to reduce RC Expo, set to 0.30 Max (default is 0.69)
- MC_ACRO_P_MAX – Use to increase pitch rates (500.0 geg/s default)
- MC_ACRO_R_MAX – Use to increase roll rates (500.0 geg/s default)
- MC_ACRO_Y_MAX – Use to increase yaw rates (500.0 geg/s default)
- MC_ACRO_SUPEREXPO – Leave as is (default 0.70)
- MC_ACRO_SUPEREXPO_Y Leave as is (default 0.70)
Stabilised Modes Max Angle
- MPC_MAN_TILT_MAX – Set to Desired Value, increase to go faster (30 deg default)
Mads Tech Protos Tuning Video Guide
Teardown Internal Images
