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6 Amazing Flux Copilot Prompts for Hardware Design in 2026

Written by Lance Cassidy

Published - 4 min read

6 Amazing Flux Copilot Prompts for Hardware Design in 2026

Flux designs electronics and mechanical parts from a plain-language prompt. It draws the schematic, routes the board, models the case, and checks its own work in simulation.

Every example below ran in Flux exactly as written. Each one shows the prompt, what Flux made, and screenshots from the Flux editor. Copy a prompt, or open the example project and try it yourself.

What a good prompt says

  • What the product must do: its functions.
  • The limits it must meet: battery life, size, cost, environment, and standards.
  • What matters most: which requirement wins when two of them conflict.

Start with who uses the product and why. That context lets Flux make the same trade-offs that you would make.

Electronics from scratch

Example: Power supply for a warehouse robot

Copy Prompt

Our warehouse robot runs on a 12 V battery. Its controller board needs 3.3 V at up to 2 A, and it must not reset when the drive motors start and the load jumps. Design the power supply and show in a simulation that the voltage stays in range during the load jump. Reliability matters more than board size.

What Flux made: A 12 V to 3.3 V power supply circuit and a simulation of the load jump. In the simulated cases, the lowest voltage was 3.181 V, inside the allowed range of 3.135 V to 3.465 V. Flux also listed the cases it could not simulate yet, so you know what to test on the bench. The block diagram shows the battery input, the input protection, the 3.3 V buck converter, and the output to the controller board.

Block diagram of the robot power supply in Flux
Block diagram
Flux simulation results for a 12 V to 3.3 V robot power supply
Try this prompt

Mechanical design from scratch

Example: Camera bracket for a tunnel wall

Copy Prompt

We install traffic cameras on concrete tunnel walls. Design an aluminum bracket that holds a 2 kg camera 150 mm out from the wall, fixed with M5 anchors, and survives years of vibration from passing trucks. Show me the stress and the safety factor. Safety matters more than weight and cost.

What Flux made: An aluminum bracket as editable CAD code and a STEP file, plus a stress check. Peak stress is 29.7 MPa and the safety factor is 8.07. Flux notes that the wall anchors and the vibration life still need a physical test.

Aluminum camera bracket in the Flux 3D view with stress results
Try this prompt

Complete devices from scratch

Example: Water level sensor for farm tanks

Copy Prompt

We sell to farms that store irrigation water in tanks. Make a Wi-Fi sensor that mounts on a tank, reports the water level every 15 minutes, and runs 6 months on batteries outdoors in rain and sun. Design the board, a weatherproof 3D-printable case, and the firmware. Battery life matters more than size.

What Flux made: The circuit, a fully routed 80 x 50 mm printed circuit board, a weatherproof 3D-printable case with a tank mount, and compiled firmware. Flux marked the design as a prototype: battery life and rain sealing must be proven in field tests before production.

Routed printed circuit board of the tank sensor in Flux
Board
X-Ray view of the tank sensor case in the Flux 3D view, with the board on the inside wall
Case
Try this prompt

Edit existing electronics

Example: Replace a part with one that is in stock

Copy Prompt

Replace U2 with a part that is in stock.

What Flux made: Flux replaced the 3.3 V regulator U2 with an in-stock part, connected it in the schematic, added the two capacitors the new part needs, and routed them on the board. The bill of materials updates automatically.

Before: U2 in the schematic, a regulator box with no pin names
Before
After: the in-stock AP2112K-3.3TRG1 as U2, with capacitors C1 and C2
After
Open the example project

Edit existing mechanical parts

Example: Make a power supply holder fit a taller power supply

Copy Prompt

We changed to a power supply that is 40 mm taller, and this holder must still cover it and keep it cool. Change the holder so it covers the new power supply and lets air through. Keep the mounting hole in the flange where it is, so the holder still fits the machine.

What Flux made: Flux made the flange 40 mm deeper, added 8 vent slots, and kept the 4.4 mm mounting hole in the same place. It saved a new STEP file and editable CAD code. The original file stays unchanged.

Power supply holder before the edit
Before
Power supply holder with the deeper flange and ventilation slots
After
Open the example project

Example: Make a controller case fit a taller part

Copy Prompt

The tallest part on the board inside this case is now 5 mm taller, and the board runs warmer. Change the case so the board fits, the USB cable still plugs in, and the board stays cool. The case can get taller, but it must keep its width and length so it still fits on the DIN rail.

What Flux made: Flux made the case 5 mm taller (68 x 56 x 27.4 mm), kept its width and length so it still fits on the DIN rail, kept the USB opening clear, and added vents in the lid and the sides. Flux flags that the cooling must be confirmed with a temperature test.

Controller case before the height and thermal update
Before
Controller case after the height and thermal update
After
Open the example project

Ready to try your own? Describe your product, its limits, and what matters most. Start a project

About the author

Lance Cassidy

Co-Founder at Flux

Lance is Co-Founder & CDO of Flux, a hardware design platform that's revolutionizing how teams create and iterate on circuits. Find him on Flux @lwcassid

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