A GPT-6 Astra-Assisted Build Turns a Conversational Idea Into Hardware
Justin Lin says GPT-6 Astra helped turn his idea for a voice-controlled Codex pet into a physical device, designing its circuit board from plans he supplied. It was his first project from a bare board to an assembled PCB, and the work involved factory revisions and multiple shell versions. Lin says the process expanded what he felt able to attempt, making him more willing to think bigger.
A physical interface made the Codex interaction feel alive
Justin Lin wanted a way to talk to Codex without opening his laptop. His idea was a “Codex pet”: a small device with a character on its display and a push-to-talk button. The point was not only to put software on a screen, but to give an interaction he already wanted a physical presence. “I really like talking to something,” Lin says. “It makes it feel alive.”
The intended interaction is straightforward: press a button, ask a question aloud, and get a spoken response. Lin demonstrates by asking whether he has any active agents. The device answers that there are five and offers to read them out. That brief exchange shows the kind of use he had in mind: asking Codex a question conversationally, with a visible character on the device rather than an open laptop.
Lin describes the project as a way to combine computer use, new physical-engineering capabilities, and something fun. The playful character and the practical question belong to the same design: he wanted the device to feel engaging, but also to make a software interaction convenient enough to use by speaking.
The board design was a starting point, not the whole build
Lin says GPT-6 Astra designed the circuit board from what he wanted and the plans he supplied. He had never taken a project from a bare board to an assembled PCB, and found that step daunting. The board that came back from the factory followed several revisions, so his account distinguishes Astra’s initial design work from the later process of revising the design with the factory.
This is my first time actually going from a bare board to assembled PCB, which was super daunting, but I told Chat what I wanted, gave it some plans and it designed the board. Obviously took a few revs with the factory, but this is what came back.
The work did not stop at one board concept. Lin says they made many parallel design candidates and “so many different shell versions.” Those iterations were part of turning an idea into a physical object: the project involved both the electronics and the device’s exterior, rather than treating the circuit board as the finished product.
Lin’s broader claim is about what that ability to iterate makes someone willing to attempt. He says working on hardware this way expands the horizon of what feels possible and empowers him to think bigger and be more ambitious than he otherwise would. For him, the Codex pet is a concrete example: an idea for a conversational interface became a set of plans, a board designed with Astra, and a device developed through factory revisions and multiple design candidates.