A manually controlled object manipulation robot with a dual-mode system — drive mode for navigation and arm mode for claw control. Built for robotics competitions at Mymensingh Engineering College. Controlled wirelessly via Bluetooth, with the full circuit assembled on Veroboard through hand soldering.
- Dual-mode control: Drive Mode (navigation) and Arm Mode (claw & arm control)
- Toggle between modes wirelessly via Bluetooth command
X - Two MG995 servo motors — one for claw open/close, one for arm angle
- 8-directional drive using dual DC motors with PWM speed control
- 9 speed levels (1–9) adjustable via Bluetooth
- Wireless control via Arduino Nano + HC-05/HC-06 Bluetooth module
| Component | Details |
|---|---|
| Microcontroller | Arduino Nano |
| Bluetooth Module | HC-05 / HC-06 (Serial at 9600 baud) |
| Servo — Claw | MG995 on Pin 9 (range 0°–150°) |
| Servo — Arm | MG995 on Pin 10 (range 0°–80°) |
| Motor Driver | L298N / relay-compatible (ENA pin 11, ENB pin 3) |
| Drive Motors | DC gear motors (×2) |
| Circuit Board | Custom Veroboard, fully hand-soldered |
| Pin | Function |
|---|---|
| D7 | IN1 — Left motor |
| D5 | IN2 — Left motor |
| D6 | IN3 — Right motor |
| D8 | IN4 — Right motor |
| D11 | ENA — Left motor speed (PWM) |
| D3 | ENB — Right motor speed (PWM) |
| D9 | Claw servo signal |
| D10 | Arm servo signal |
| Command | Action |
|---|---|
F |
Move forward |
B |
Move backward |
L |
Turn left |
R |
Turn right |
G |
Forward-left diagonal |
I |
Forward-right diagonal |
H |
Backward-left diagonal |
J |
Backward-right diagonal |
S |
Stop |
1–9 |
Set speed level |
X |
Switch to Arm Mode |
| Command | Action |
|---|---|
L |
Claw up (closes grip) |
R |
Claw down (opens grip) |
F |
Arm forward (increases angle) |
B |
Arm back (decreases angle) |
S |
Stop / hold position |
X |
Switch back to Drive Mode |
- Upload
Cosmo_code_adv.inoto Arduino Nano via Arduino IDE - Power on the robot
- Pair your phone with the Bluetooth module
- Open a Bluetooth Serial Terminal app
- Default mode is Drive Mode — use directional commands to navigate
- Send
Xto switch to Arm Mode and control the claw and arm - Send
Xagain to return to Drive Mode
Built for robotics competitions at Mymensingh Engineering College. Full circuit prototyped and hand-soldered on Veroboard. Both servos are incrementally controlled with a 50ms move delay for smooth, precise operation.
Mymensingh Engineering College — EEE Department