Smartphone Controlled IoT Car

Project Overview

An IoT car that can be remotely controlled at high speed via a smartphone, using a NodeMCU for Wi-Fi connectivity.

Bill of Materials (BOM)

• NodeMCU ESP8266 board
• car chassis with motors and wheels
• a motor driver (e.g.
• L293D or L298N)
• and a battery pack.

Circuit Diagram & Component Arrangement

Follow the wiring diagram below. Each component connects to specific pins on the microcontroller. Use a breadboard for prototyping and ensure all connections are secure before powering on.

Wiring Summary: The NodeMCU connects to a motor driver, which controls the car's motors. The NodeMCU hosts a web server or connects to a service, allowing a smartphone on the same Wi-Fi network to send control commands.

Step-by-Step Procedure

1. Step 1 - Prepare Components: Gather all components from the BOM. Inspect for damage and verify ratings.
2. Step 2 - Breadboard Layout: Place the microcontroller on the breadboard. Arrange components for clear wiring paths.
3. Step 3 - Power Connections: Connect VCC and GND first. Ensure proper polarity for polarized components.
4. Step 4 - Signal Wiring: Connect sensors and actuators per the wiring table. Double-check pin assignments.
5. Step 5 - Upload Code: Connect USB, load the sketch, and upload. Verify serial output if applicable.
6. Step 6 - Test & Calibrate: Power on and test each function. Calibrate sensors if needed.
7. Step 7 - Enclosure (Optional): Mount in a 3D-printed or custom enclosure for durability.

Safety Notes

• Always disconnect power before making wiring changes.
• Use appropriate eye protection when soldering.
• Adult supervision is required for makers under 16.
• Do not exceed voltage ratings of components.