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The Arduino ESP32 All-in-One Robot is a four-wheel maker project controlled primarily by an Arduino Uno, not by an ESP32 alone. An ESP32-CAM adds Wi-Fi video, while a separate HC-06 module handles Bluetooth control. The author describes obstacle avoidance, line tracking, following, Bluetooth remote control, and live video as project modes; the available project pages do not report independent performance tests.
How the robot is put together
c.iurisci, also credited as Catosci, published the build on Instructables on March 25, 2022; Hackster indexed it on April 6, 2022. The name can be misleading: the parts list and wiring identify the Uno as the main controller and the ESP32-CAM as a camera board. The HC-06 is a separate Bluetooth module. The project connects the camera’s serial RX to Arduino TX and cautions that Bluetooth must be disconnected when that camera serial connection is in use.
The guide’s main components include an Arduino Uno and Sensor Shield V5.0, an L298N dual H-bridge motor driver, four DC motors and 65 × 26 mm wheels, a five-way 5 V tracking module, IR sensors, an HC-SR04 ultrasonic sensor, an SG90 micro servo, a buzzer, the ESP32-CAM, and the HC-06. It also lists a mini breadboard, battery holder, jumper wires, standoffs and screws, and 100 kΩ and 1 MΩ resistors. See the Instructables build guide and the Hackster project page for the published inventory and project details.
Custom chassis and assembly
The build uses custom 3D-printed upper and lower chassis sections, plus an HC-SR04/ESP32 holder, an ESP32 clip, and spacers. In the guide’s assembly, the motors, driver, and tracking sensor go on the lower chassis; the Uno, sensor shield, IR sensors, servo, buzzer, and battery holder go on the upper section. The ultrasonic sensor and ESP32-CAM sit in a printed holder carried by the servo. Wiring is routed through the chassis before the two sections are joined and the wheels installed.
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The author links a Thingiverse design, and Hackster indexes custom parts. A builder who cannot print these pieces will need a suitable printing service or a mechanically compatible alternative; ordinary off-the-shelf robot chassis are not established as drop-in replacements.
What each mode does
Obstacle avoidance and following
The project describes using ultrasonic and IR sensing in its obstacle-avoidance and following explanations. The pages state these as capabilities but do not establish sensing range, reliability, or behavior under particular conditions.
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Line tracking
A five-way tracking module is used for line tracking. Its signal connections use several Arduino analog pins according to the project guide.
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Bluetooth remote control
The HC-06 provides Bluetooth input for direction control and mode activation through an Android app. This Bluetooth function is distinct from the ESP32-CAM’s Wi-Fi video connection.
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Wi-Fi video
The ESP32-CAM sends video over Wi-Fi to an Android app, according to the project description. The pages do not provide measured video latency, image quality, or range.
Published wiring and checks before powering up
The following is the author’s pin map for the listed Uno and Sensor Shield setup, not a substitute for checking the actual board and module labels. The guide groups the four motors by right and left sides and connects each group to one L298N output.
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| Connection or function | Published wiring |
|---|---|
| Motor driver enable | Arduino pins 3 and 11 |
| Motor direction control | Arduino pins 4–7 |
| Two IR sensors | Arduino pins 2 and 8 |
| Servo | Arduino pin 12 |
| Buzzer | Arduino pin 13 |
| Ultrasonic sensor | Arduino Sensor Shield URF connection |
| Five-way tracking module | Several Arduino analog pins; consult the guide’s diagram for the exact connections |
| Battery-voltage measurement | 100 kΩ and 1 MΩ resistors in a divider, as described by the guide |
- Verify the exact pin labels and pinout of your Uno, shield, sensors, driver, and camera board before connecting them.
- Check power and logic voltage compatibility for each module; do not assume that parts with similar names or appearances share the same requirements.
- Confirm the motor driver is appropriate for the motors and their current demands. The project pages do not provide measured motor current or a substitute-selection comparison.
- Follow the guide’s warning to disconnect Bluetooth when using the camera serial connection to Arduino TX.
The project wiring is specific to its listed hardware. Its published instructions are not an independent electrical-safety review.
Code, app, and what is not established
The Hackster page links downloadable Arduino Uno and ESP32-CAM code archives and identifies an Android app. Their availability and behavior have not been independently verified here, so check the project pages and files before building around them. The project pages do not establish the robot’s speed, sensing range, runtime, video latency, or total cost; those figures should not be inferred from the parts list.
Best Value
- 【ACEBOTT STEM Smart Robot Kit】: ACEBOTT Bipedal Robot Kit is an acrylic kit based on the ESP32 platform that allows beginners (children) to gain practical experience in programming, electronic assembly, and robotics knowledge. (Note: This kit does not include batteries, you need to prepare the batteries yourself.)
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For substitutions, compare supply and logic voltage compatibility, motor-driver current capacity, sensor interface and pinout, mounting dimensions, and whether the replacement preserves separate Bluetooth control and camera video. The project pages do not test or endorse alternative parts.
Quick Recap
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