From custom circuit boards to movement and control. Projects that work beyond the screen.
Working prototype
Robotic arm
Six channels. Custom control.
Development began with web controls and motion recording and playback. The newer assembly uses Hiwonder HTS-25L serial servos, three joysticks and a dedicated display. A printed base with a large bearing supports the arm; the bottom servo drives its rotation.
Start recording, move the axes, then press Stop. Playback includes your timing and pauses. Recordings of up to 60 seconds are kept until you reload the page.
Arm development and physical controls+
From PWM to serial servos
The original Arduino Mega and PCA9685 setup was gradually replaced with Hiwonder HTS-25L serial servos. Each has its own address and can report position, voltage and temperature. The newer local controller uses configured motion ranges and servo speeds.
What works and what comes next
The original assembly demonstrated web control of six channels, plus motion recording and playback. The newer serial-servo assembly adds local control with three joysticks and a display. A camera, LiDAR and autonomous AI planning are planned next steps.
The bearing carries the structure; the servo rotates it
A custom platform transfers the arm's load through a turntable bearing into a fixed base. The bottom servo therefore does not have to support the whole assembly. The modified upper part has room for two shoulder servos that can work together.
The bearing has an outer diameter of 120 mm, an inner diameter of 70 mm and a height of 8.5 mm. The HTS-25L servo body measures 40 × 20 × 40.5 mm. The arm's actual strength also depends on link lengths, power supply and servo coordination.
Web controls with a 2D model, sliders and motion recording.
The custom arm base during assembly.A close-up of the serial servo in the arm structure.
The first Mecanum robot with a handmade circuit board.
Working prototype
Mecanum robot
Four wheels allow forward and sideways movement and rotation on the spot. The robot receives commands over Wi-Fi, reads the operator's text aloud and sends back a person's response from its touchscreen.
I made the first circuit board by hand. The new design is ready for etching.
Communication and custom electronics+
The robot plays text entered by the operator. A local server generates Slovak speech using Piper TTS and sends it to the robot over Wi-Fi. A person beside the robot can answer a question on its touchscreen; the response returns to the control panel.
Motor control, speech and touchscreen communication work. The first version used a handmade circuit board. The new board design is complete and ready for etching. Live camera streaming is the next development step.
First version: handmade
The first prototype: an assembled, handmade circuit board.Copper traces and solder joints on the first version.
New board · ready for etching
A custom design for the next version
The 100 × 130 mm board has transfer artwork prepared for both sides. The design also includes the Benda Robotics branding. Etching, assembly and testing on the robot come next.
Displays cryptocurrency and system data away from the computer. It connects custom software, displays, network data and embedded hardware.
Smart feeder
Tops up the bowl based on its actual weight.
Working prototype
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The assembled feeder prototype with printed parts.
Weighs the contents of the bowl and dispenses food to a target weight. Readings appear on a display; dispensing can be controlled with buttons, over the network or through Telegram.
I designed and 3D-printed the mechanical parts. The working prototype took 17 days to build.
From 3D design to weighing+
Preparing the container for 3D printing.The bowl and controls during prototype assembly.
Smart blinds and home automation
Home controls used every day.
System in daily use
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Servomotors control the blinds through voice or AI commands, a Raspberry Pi dashboard, the web and a local controller.
AI hologram interface
An AI assistant with a holographic face, voice and memory.
Experimental prototype · in development
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The prototype connects a rotating holographic display to a Raspberry Pi, microphone and speaker. The AI assistant listens, speaks and accompanies the conversation with facial expressions timed to match it. This creates the impression of talking to a hologram present in the room.
Custom personality and memory
I designed and configured the assistant's personality, behaviour rules and tasks myself. I can give it new information and instructions during a conversation. It stores them in memory and uses them in later interactions, so each conversation does not have to start from scratch.
From conversation to home control
The assistant is also connected to the blinds. It can recognise the intent of an everyday sentence and identify the relevant device. If I say, “The right side of the room is too dark,” it recognises the need for more light and raises only the right blind. Natural conversation becomes a specific action in the room without an exact control command.
Face artwork for the AI interface.
Let's start with a conversation
What shall we
try together?
A problem, an idea or an initial brief is enough. We can discuss what makes sense to build and the first step to take.
Pass two checkpoints and park. Try what ordinary wheels cannot do.
Ready↑front
3D model of my prototype based on photographs
12P
Drive through ring 1.
Arrow keys = forward, reverse and sideways movement. A / D or Q / E = turning. Directions are relative to the front of the car. Tap for a small step or hold for continuous movement.
Browser simulation. Angled rollers and independently controlled wheels allow sideways movement and rotation on the spot. Watch each wheel change direction as you drive.
