Tank

🚗 Project: Remote-Controlled Car with ESP8266, Arduino CNC Shield and DRV8825 Drivers

🔹 General Description

The project involves building a remote-controlled car controlled via Wi-Fi through a web interface, developed with ESP8266 and Arduino Uno + CNC Shield.
The system allows controlling the car's movements (forward, backward, right, left) by operating four NEMA 17 stepper motors (model 17HD48002H-22B) driven by DRV8825.
Power is supplied by a Li-Po 3S 11.1 V 2200 mAh battery.

🔹 Main Components

🔹 Functional Diagram (description)

1. Power Supply:
   • The 11.1 V Li-Po battery powers the “12–24 V” terminals of the CNC Shield (for the DRV8825).
   • A parallel branch passes through the step-down, which provides stable 3.3 V to the ESP8266.
   • All grounds (GND) are connected in common (battery, shield, ESP).
2. Motor Control:
   • The DRV8825 drivers receive STEP and DIR signals from the CNC Shield pins.
   • The NEMA 17 motors are connected to the driver outputs A1–A2–B1–B2.
   • Microsteps M0, M1, M2 are configured to LOW (full step).
3. Communication:
   • The ESP8266 acts as a web server: when the user accesses it via PC or iPhone, they can send commands to move the car.
   • Commands are transmitted serially to the Arduino, which interprets them and activates the corresponding motors.
4. Web Interface:
   • An HTML page with directional buttons (↑ ↓ ← →).
   • The buttons work with “mousedown” / “mouseup” events, allowing movement only when held down.
5. Status LED:
   • An LED connected to an ESP pin lights up when the module is connected to the Wi-Fi network and the server is active.

🔹 Operation

1. Upon power connection, the ESP8266 connects to the Wi-Fi network.
2. Once connected, it turns on the status LED and starts the web server.
3. The user opens the web page from the browser and controls the car's movements.
4. The Arduino receives commands and actuates the motors based on the chosen direction.
5. The system is completely wireless and autonomously powered by the battery.