An Offline Voice-Activated Robot with Dynamic OLED Facial Expressions
VoxBot is an interactive, voice-controlled robotic platform designed to blend mobility with personality. Unlike cloud-dependent assistants, VoxBot utilizes the DFRobot DF2301Q module for high-speed, offline voice recognition, allowing it to respond instantly to 15+ commands.
The robot features a "Digital Soul" powered by a SH1106 OLED display, which renders various facial expressions—from "Sleeping" and "Sad" to "Dancing" and "Ready"—coordinated with its physical movements. Whether it's guarding its station or performing a dance, VoxBot provides a tangible example of human-robot interaction.
- 🎙️ Offline Voice Intelligence: Responds to specific Command IDs (CMDIDs) without needing an internet connection.
- 👁️ Reactive Expressions: A custom-coded graphics engine using the
U8g2library that changes eyes and mouth shapes based on the current action. - 🕹️ 4-Wheel Drive Mobility: Controlled via an L298N/L293D driver for precise Forward, Reverse, and Turning maneuvers.
- 🎭 Animated Sequences: Complex "Dance" and "Guard" modes that combine servo head movements, wheel-base rotation, and facial animations.
- ⚡ Real-time Feedback: Serial monitoring of command IDs for easy debugging and interaction logging.
| Normal | Happy/Dance | Sleeping | Sad |
|---|---|---|---|
[ ][ ] |
(^)(^) |
z z Z |
( T )( T ) |
| Component | Qty | Notes |
|---|---|---|
| Arduino Uno/Nano | 1 | Main Controller |
| DFRobot DF2301Q | 1 | I2C Voice Recognition Module |
| SH1106 OLED (128x64) | 1 | I2C Display for Facial Expressions |
| L298N Motor Driver | 1 | Drives the 4 DC Motors |
| DC Motors + Wheels | 4 | Robot Chassis |
| SG90 Servo Motor | 1 | Head/Arm rotation (Pin 12) |
| 7.4V Li-ion Battery | 1 | Power source for motors |
| Arduino Pin | Component | Function |
|---|---|---|
A4 (SDA) |
OLED & Voice Module | I2C Data |
A5 (SCL) |
OLED & Voice Module | I2C Clock |
D12 |
SG90 Servo | Signal Wire |
D8 / D9 |
Motor Driver | Speed Control (enA / enB) |
D2, D3, D4, D5 |
Motor Driver | Direction (in1, in2, in3, in4) |
| Command ID | Voice Trigger | Action | Face Style |
|---|---|---|---|
| 5 | "Start Forward" | Moves forward + Servo sweep | Blink / Smile |
| 7 | "Reverse" | Moves backward | Normal |
| 9 | "Guard Mode" | Pivot turns + scanning | Normal |
| 12 | "Tired" | Stop all motion | Sleepy (Zzz) |
| 13 | "Dance" | Fwd/Back + Servo + Smiles | Excited |
| 16 | "Sad" | Move back slowly | Crying Eyes |
- Install Libraries:
DFRobot_DF2301QU8g2Servo
- Upload Code: Open the
.inofile in Arduino IDE, select your board, and hit upload. - Calibrate Servo: Ensure the servo is centered at 180 degrees during assembly to allow for the code's
180 -> 105sweep.
Created by Md Mahbubur Rahman.