A small, simple display for household information over MQTT. Based around the ESP12F chip, with an integrated 128x64 OLED display for information visualization, and 20x LEDs to display general status information.

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2-layer SELV ESP8266 smart relay logic board using an ESP-12F module, MCP1700-3302E 5V-to-3.3V LDO, exact 2x7 relay/control connector pinout, 4-pin UART programming header, GPIO0 flash test point, active-low GPIO2 status LED, power and GPIO test points, 55x45 mm board outline, top-side assembly, bottom solid ground pour, ESP-12F antenna keepout, 4 M3 mounting holes, and silkscreen connector labels for production use.

ESP12F IoT Node with SIM800L Cellular, MT3608/AMS1117 Power, SPI Flash, I2S Audio, USB-C UART, and Li-Ion Management