Autonomous RC Car

A fully-simulated RC car that drives itself, avoids obstacles, survives tilt, listens for remote commands, and displays live telemetry — all running in your browser.

What's in the box

2D Circuit (17 parts, 39 wires)

• Power: 9V battery → power switch → 7805 regulator → 5V rail
• Drive: L298N H-bridge → left + right DC motors → 65 mm wheels
• MCU: Arduino Uno, all pins mapped
• Sensing: HC-SR04 ultrasonic (front), MPU6050 6-axis IMU over I²C
• Status: SSD1306 OLED over I²C, 8-LED NeoPixel strip, 8 Ω speaker
• Comms: HC-05 virtual Bluetooth remote

3D Chassis

• Beveled hollow-box body (140 × 24 × 95 mm)
• Battery bay plate
• Four M3 standoffs for the PCB
• Four revolved-profile tires with proper tread cross-section
• Yellow front bumper
• Cylindrical sensor mast

Sketch

Production-quality control loop with three layers:

1. BT override (highest priority) — type commands in the BT panel:
   • S — emergency stop
   • F — force forward
   • L / R — force turn
   • A — return to autonomous mode
2. Crash detection — MPU6050 ax > 0.6g → stop, flash orange, beep
3. Obstacle avoidance — HC-SR04 distance → green/yellow/red speed bands, back-up-and-turn under 12 cm

How to show it off

1. Click Run sketch in the Serial panel.
2. The World · RC panel (bottom-right) shows the car driving live — yellow triangle on a 4 × 3 m arena with a fading trail.
3. Watch the NeoPixel strip change color: green cruising, yellow slowing, red reversing.
4. Drop an obstacle in front of the car: click the HC-SR04 part in the 2D canvas and set distanceCm to 8 in the inspector. The car stops, backs up, and turns.
5. Simulate a tilt: click the MPU6050, set ax to 0.7. Orange alert + horn.
6. Remote-control it: type S, F, L, R, A in the BT input below the Serial log.

Things to try

• Open the Oscilloscope, probe D5 (ENA), watch the real PWM waveform drive the H-bridge.
• Open the 3D Lab tab — the chassis is built with beveled boxes, array-copied standoffs, mirrored tires using revolve primitives.
• Edit the sketch to add a figure-eight path using the virtual wheel encoders.
• Build a second lab with the same circuit, tune the PID constants for smoother obstacle avoidance.

Why this matters

This demo exercises every simulation layer shipped in ExoSynk:

• MNA solver (DC + transient) handles the L298N + motors + regulator
• Real PWM produces actual pulse edges on analogWrite
• I²C bus model routes MPU6050 accel bytes + OLED text
• Interrupt support (attachInterrupt) is available for wheel encoders
• Vehicle physics integrates differential-drive kinematics
• 3D CAD with bevel, revolve, standoff, hollow-box primitives
• Virtual BT remote for phone-style control without hardware

The same sketch runs on real Arduino hardware with zero changes.

Build it virtually. Ship it physically.