This is an automated archive made by the Lemmit Bot.

The original was posted on /r/homeassistant by /u/Witty_Initial4890 on 2026-08-03 08:26:37+00:00.

https://preview.redd.it/574np6eme4hh1.jpg?width=4080&format=pjpg&auto=webp&s=804c7e6129c5df455ccde437fdd8b3f907ccd4b7

I already had "Ok Google, turn on the computer" triggering my TV and Hi-Fi through Home Assistant, but the PC itself was always the missing piece — WOL never played nice with my setup, and I wanted something that worked reliably regardless of BIOS quirks.

Ended up designing a small PCIe card (ESP32-H2 based) that physically simulates pressing the power/reset buttons on the motherboard, powered straight off the PCIe slot's standby rail (3.3Vaux). It shows up in HA as a switch via Zigbee, alongside the rest of my relay-based lighting/shutter setup.

Fully open — schematic, gerbers, and firmware linked below if anyone wants to build their own:

Full write-up: https://hackaday.io/project/206323-too-lazy-to-press-a-button-so-i-built-a-pcie-card

Hardware: https://oshwlab.com/scavenrage/project_nexpziyw

Firmware: https://github.com/scavenrage/PCIe-PC-Power-Control-ESP32-H2 https://github.com/scavenrage/ESP32-H2-Custom-Zigbee