4x4-speed-bot

4×4 Speed Bot — UNO R3 + 2× TB6612 + 4× TT

Goal: beginner-friendly path for a 14-yo to build a fast 4×4 Arduino robot car, step by step, with tiny wins (Blink → Button→LED → Ultrasonic → Drive 4×4).

Motto: So imperfect we’re perfect. Ship V1. Learn. Perfect.
Idioma: English with fun ES bits (bilingüe corto).

Hardware (kit mínimo)

ELEGOO UNO R3 + USB A-to-B
2× TB6612FNG motor drivers
4× TT motors + 65–69 mm wheels + 4WD chassis
4×AA battery holder (switch) — motors only
Breadboard, jumpers, push-button, 220 Ω resistor
(Module 2) HC-SR04 ultrasonic sensor

Power: 4×AA → VM on both TB6612; UNO by USB; COMMON GND.

Folder structure

docs/
  student_guide_module_01.md
code/
  step01_blink/step01_blink.ino
  step02_button_led/step02_button_led.ino
images/
  (coming) wiring_button_led.png

Quick Start

Install Arduino IDE 2.x → https://www.arduino.cc/en/software
Select board/port: Arduino Uno + correct serial port (COMx / /dev/cu.*).
Open code/step01_blink/step01_blink.ino → Verify (✓) → Upload (→).
Wire Button→LED as in Module 1 and upload step02_button_led.ino.

Troubleshooting: no port → try other cable/driver CH34x; LED no enciende → revisar polaridad y resistor; botón siempre ON → usar INPUT_PULLUP y la otra pata a GND.

Modules

M1 — Install → Blink → Button→LED
↳ docs/student_guide_module_01.md, code/step01…, code/step02…
M2 — Ultrasonic alert (HC-SR04) (next)
M3 — Wire 2× TB6612 & first 4×4 drive (soon)

Wiring cheat (4×4)

TB1 (left): PWMA→D5, AIN1→D7, AIN2→D8; PWMB→D6, BIN1→D9, BIN2→D10; STBY→D4
TB2 (right): PWMA→D3, AIN1→D12, AIN2→D13; PWMB→D11, BIN1→A0, BIN2→A1
Differential mix: left=thr+steer, right=thr−steer (0–255)

Contribute (cómo colaborar)

Open an Issue per task (M1/M2/M3…).
Create a branch, commit your files inside code/ or docs/, and open a PR.
Keep images in /images (PNG). Avoid PDFs when possible.

License

MIT (friendly for students and schools).

Last updated: 2025-09-29

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