Real CAD
Built around real parts
Cases wrap the actual part models: standoffs, port openings and a lid with a lip, measured for collisions and thin walls.
Describe it. Build it.
From one sentence to real CAD, wiring and firmware for robots and hardware.
- Arduino Uno R3
- ESP32 DevKit V1
- Raspberry Pi Pico
- BME280
- DHT11
- HC-SR04
- SG90 servo
- SSD1306 OLED
- 5 mm LED
- 6 mm button
Product tour · 75 seconds
This is the app, not a mockup.
Describe a device, look inside the 3D model, open the wiring guide and the firmware, then tune a design in Projects, watch every check turn green and run the simulation.
How it works
From a sentence to a working device.
Three moments from the product tour.
Step 1Describe
Say what you want to make
Type the device in plain words and press send. Tetsu picks the parts and designs the case.
Step 2Check
Every check turns green
Power, motor torque, how far a beam sags, whether parts fit and are in stock: each one checked, with the numbers.
Step 3Run
Run it before you build it
Run the simulation on the design you just tuned, before a single part is printed or ordered.
Start from a ready circuit
17 circuits, ready to open.
Real parts on a real breadboard. Open one in the workspace, change it, run it.
Inside every project
Everything you need to build it.
One project holds the case, the circuit, the code and the guide. Here is a real one: a button that lights an LED on an Arduino Uno.
Wiring
Checked before you build
- Series resistor on LED1: 220 Ω
- Pin voltage: 5 V logic on the Uno
- USB power budget: within the limit
Firmware
Code for your pins
Arduino C++ written for the pins in your circuit: the LED on D13, the button on D2.
const int LED = 13;const int BTN = 2;void setup() {pinMode(LED, OUTPUT);pinMode(BTN, INPUT_PULLUP);}void loop() {digitalWrite(LED, digitalRead(BTN) == LOW);}
Files
Print it, keep every file
Questions
Questions, answered
No. Describe the device in plain words. Tetsu picks real parts, designs the case, wires the circuit and explains every step in the build guide.
Real models of the Arduino Uno, ESP32, Raspberry Pi Pico, BME280, DHT11, HC-SR04, SG90 servo, SSD1306 OLED, a 5 mm LED and a 6 mm button. Cases are built around their actual shapes and ports.
No. You print the case on your own printer or at any print shop. Tetsu gives you the STL file and the print settings.
An STL to print, a STEP file for your own CAD tool, the Arduino sketch and an HTML build guide with the parts list and every connection. They are ordinary files, so nothing stays locked in the app.
Not yet: the shop is coming soon. The build guide lists every part, so you can order them from any store today.
English, Chinese and Japanese, on this page and in the app.
Your idea is one sentence away.
Describe the device. Tetsu designs it, checks it and hands you the files.
Tetsu is built by Athena Labs, who also make robot-arm hardware. Meet Athena Labs