Edith Devlog

Spent today taking Edith from a bare Pico 2 schematic to a fully routed PCB with zero DRC errors. Feels good. Got the core sensing stack wired up: an I2S mic, a speaker amp, a small OLED for status, a status LED, and a reflective IR sensor so the glasses boot up when you actually put them on. Also added a camera (ArduCAM Mini OV2640) over SPI, and partway through swapped the plain Pico 2 for a Pico 2 W so I could get Bluetooth/WiFi without giving up a single GPIO — the wireless chip talks to the RP2350 internally, never touches the exposed pins. For power, I’m going with a LiPo + an external TP4056 charging module instead of building charging circuitry into the main board, feeding in through VSYS so the Pico’s own USB-C stays free for programming. Honestly the most useful part of today wasn’t the designing, it was catching my own mistakes before they turned into a real, fabricated mistake. Caught a header that looked wired but wasn’t, a resistor that was 1000x too big (330k instead of 330 ohms — RIP my IR LED if I hadn’t caught that), an amp that would’ve gone dead silent the second it switched off USB power, and a decoupling cap I forgot entirely and then placed on the wrong side of the board. Board’s a full prototype size right now, nowhere near small enough to fit in an actual temple — that’s the next phase, probably splitting it across smaller boards connected by flex cable once I know the electronics actually work. Next up: get this fabbed, then start on firmware.