What began as a cheap robo-vacuum with a short life span turned into a small open-source robotics project. When the stock control board failed, I decided to gut the unit and rebuild it from the chassis up, transforming it into LLOYD: the Laser-Guided Lifter Of Your Dirt.
At its core, LLOYD runs on an Arduino-based control system, ranging sensors, and some mapping sensing sent back to a python based API to create more indepth room mapping than vaccuums do, replacing the closed-firmware logic of the original board. The new setup adds open-source flexibility, motor PWM control, obstacle sensing, and a laser-based guidance array for wall detection and distance mapping.
The project reuses:
- The original drive motors and wheel encoders
- The brushless suction fan (now PWM-regulated for power efficiency)
- A reflashed Li-ion pack with onboard voltage monitoring
- IR and ultrasonic sensors for near-field navigation
- And a pair of green laser diodes for visual reference and collision detection
Once the new firmware was tuned, LLOYD could traverse rooms using a simple PID-based movement algorithm and wall-following logic with some overall instruction fencing back from the Python API. The laser array adds a bit of retro-futurist flair, Tron meets Roomba. With a plastic cereal bowl for a head.
Build Notes
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Control Board: Arduino Uno + L298N motor driver
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Sensors: Dual ultrasonic, dual IR, dual laser emitter
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Power: 7.4 V Li-ion pack, ~2 hr runtime
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Chassis: Modified low-cost vacuum shell + plastic cereal bowl for add-on control system
- Network: Arduino WiFi Shield
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Software: Arduino navigation loop and Python API fencing
Reflections
The fun part of projects like this is that a cheaply manufactured ‘disposable’ hardware into something worth learning from. LLOYD may never rival a commercial robot vacuum in performance, but it’s a hands-on lesson in control systems, feedback, and autonomy, and a reminder that even cheap broken robots can become testbeds for innovation.
