We wanted to build a small car that could move from a phone or laptop without a dedicated remote. Using an ESP8266 for WiFi control and an L298N motor driver for power, we turned that idea into a working project with a simple web interface.
The Idea
The goal was to make a compact, low-cost robot car that responds quickly to forward, reverse, left, and right commands. The ESP8266 handles the wireless connection and sends those commands to the motor driver, keeping the control system simple and easy to expand.
What We Used
- ESP8266 development board
- L298N dual H-bridge motor driver
- Four DC gear motors and a small car chassis
- Wheels, caster wheel, and jumper wires
- Ultrasonic sensor for obstacle detection
- Battery pack and USB cable for programming
- A phone or laptop connected to the car's WiFi network
How It Works
- The ESP8266 starts a WiFi access point and hosts a small control page.
- A button press on the page sends a movement command to the board.
- The ESP8266 translates the command into direction signals.
- The L298N uses those signals to drive the four motors forward or backward and right or left.
- By changing the direction of each motor, the car can turn and stop.
Equipments: connect the ESP8266 control pins to the L298N input pins, connect each motor to an output pair, and use a shared ground between the board, driver, and battery.
Problems We Fixed
- The motors stuttered when the battery could not provide enough current, so we used a more suitable power source.
- The ESP8266 reset unexpectedly until the motor power and board power were separated more carefully.
- One motor spun in the wrong direction, which we corrected by swapping its output connections.
- Commands felt delayed until we simplified the control page and sent only the action needed.
What's Next
- Add speed control with PWM.
- Build a better mobile-friendly control panel.
- Explore an automatic mode that follows a planned route.
Takeaway
This project showed us how a small microcontroller, a motor driver, and a few well-tested connections can become a complete connected machine. The most useful lessons were in power management, shared grounding, and testing one part of the system at a time.