Reworked with thinner tracks and 0402 components, ESP32-PICO-NANO-02, Tiny 0.6" x 0.7" PCB, RGB LED, Regulator (DC 4V-60V), 5 pin programming (same as Shelly 1), 14 full GPIO pins (inc Tx, Rx, GPOIO0). Hoping I can hand assemble 0402 - will be a first for me!

This is my latest design, a very small ESP32-PICO-NANO-02 based board, with voltage regulator (4V-60V DC), 5 pin 3.3V programming connector (same as Shelly 1). 4 input only GPIO, 8 full GPIO (including Tx, Rx, and GPIO0), all on 0.1" spacing. Smallest I could make it. I'll have to put some on my next PCB order. All on GitHub.

My latest board is not really a "relay" board as such, as I have used ISL89410 drivers. These seem really nice and will push/pull a reasonable current from the 12V supply. I've done it as an 8 output board, but quite small, 46.5mm x 30mm. As ever, parts are difficult to get hold of right now. Should have this in a couple of weeks.

Toot.me.uk

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