kaushal kumarRobo Soccer · NSECT-2026
A wireless 4-wheel differential-drive robot with a browser-based multi-touch control interface.
What it is
A competitive 4-wheel soccer robot built for robotics competition play. The ESP32 hosts its own WiFi network and serves a full-screen, touch-friendly controller straight to a phone or laptop browser. Nothing to install on either side.
Technical notes
- True differential steering rather than a skid turn: the outer wheel holds full speed while the inner wheel slows proportionally, tuned by feel until the robot held a predictable arc instead of slipping
- Genuine multi-touch support, so forward+left or backward+right register as one diagonal move instead of two conflicting button presses. This matters for the fast direction changes a match demands
- Speed mode, turn sensitivity, and drift-balance correction are all adjustable live from the browser controller, with no firmware re-flash needed between rounds
- Dual L298N motor drivers across 4 BO gear motors, ESP32 running at 240MHz with WiFi power-saving disabled to cut input lag
Evidence
The public repository has the full firmware, wiring diagram, and pinout table.
Next iteration
The README’s own future-improvements list is a good next-step map: onboard camera for FPV or autonomous ball tracking, PID-based motor control instead of open-loop PWM, and a telemetry dashboard for match review.