September 23, 2026
AI Agent Reached the Wall: Codex Helps Build a Voice Assistant on Raspberry Pi
On September 23, Sid Rampally built a voice assistant on a 128×64 LED panel with Codex, Raspberry Pi, and GPT-Live-1. The display shows weather, subway train arrivals, and other data.
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From wiring to debugging the command “show this on the wall”: @sidrampally explains how he used Codex to turn an LED panel into a voice assistant. It runs on GPT-Live-1 and Raspberry Pi, shows weather, subway train arrivals, and more:
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Previously, the command “show this on the wall” passed only the latest request to the app. Now it adds recent dialogue and past results, so the display receives an answer connected to the conversation.
Built from components. Codex helped Sid Rampally connect Pi, an LED panel, and a voice service. For a generic ESP32 with HUB75, WLED-MM requires a build with WLED_ENABLE_HUB75MATRIX, then 2D Configuration is used to set one matrix to the total size.
GPT-Live-1 costs $0.05 per minute, while Responses API and tool calls are billed separately.
