Leftovers & layout – WLED board revision A completed!
Sunday night, Babyada went to bed early, so we finished the capture and layout of our WLED board. Thanks to all the suggestions, we were able to implement quite a few!
For power, use USB C PD with switch-select or DC up to 24V; they are diode-OR’d together with PMEG3050 (https://www.digikey.com/short/zv22b0pq) into a massive 5A 24V fuse. For the 5V regulator, we picked NCP718ASN500T1G – it’s linear, but we don’t need a lot of current at 5V. For 3.3V, we went with our trusty TPS54202.
Upon request, we kept the ICS-43434 I2S microphone and added an IR 38KHz receiver. For external connectivity, there’s an ADC/DAC/GPIO #27 breakout on a JST SH 3-pin and I2C on a StemmaQT/Qwiic 4-pin.
We also added a 2×3 breakout header with 3V, GND, and 3 more GPIO so you could connect an external microphone, IR receiver, buttons, or rotary encoder. The terminal blocks have three 5V level-shifted outputs with 100 ohm in-line resistors and power/ground pairs for each. If you need just one more LED strand, the fourth 5V signal is on the 2×3 block.
Rounding out the design are four mounting holes, a reset button, GPIO #0 user button, GPIO LED, and an individual NeoPixel, which could be useful for testing. It’s still pretty small, 2″ x 1.3″. With an ESP32-Mini module, we can pick a PCB or wFL antenna port, and it’s an easy swap to make it use an ESP32-Pico, which has 2MB PSRAM.
Whatcha think – anything else we should add or watch out for?
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