# WiFi PC Power Switch ## Description Minimal ESP32 and PC817 optocoupler schematic for an isolated WiFi-controlled PC motherboard power-switch interface. ## Project Details - **Owner:** sivakami22 - **Created:** 6/11/2026 - **Last Updated:** 6/11/2026 - **Visibility:** Public ## Key Components ### ESP32 — [ESP32-WROOM-32E](https://www.flux.ai/lcsc/esp32-wroom-32e~pa8i.md) - License: https://creativecommons.org/licenses/by/4.0/ - Symbol Style: parametric-v1 - Role: WiFi controller - JLCPCB Part Class: Extended Part - Part Type: WiFi Modules - Manufacturer Name: ESPRESSIF(乐鑫) - LCSC Part Number: C2973652 - Package or Case Code: WIFI-SMD_ESP32-WROOM-32E-A - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf - Manufacturer Part Number: ESP32-WROOM-32E **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND [pin 47] - GND [pin 39] - GND [pin 38] - GND [pin 44] - GND [pin 45] - GND [pin 40] - GND [pin 41] - GND [pin 46] - GND [pin 15] - GND [pin 42] - GND [pin 43] - GND [pin 1] - IO0 [pin 25] - IO12 [pin 14] - IO13 [pin 16] - IO14 [pin 13] - IO15 [pin 23] - IO16 [pin 27] - IO17 [pin 28] - IO18 [pin 30] - IO19 [pin 31] - IO2 [pin 24] - IO21 [pin 33] - IO22 [pin 36] - IO23 [pin 37] - IO25 [pin 10] - IO26 [pin 11] - IO27 [pin 12] - IO32 [pin 8] - IO33 [pin 9] - IO34 [pin 6] - IO35 [pin 7] - IO4 [pin 26] - IO5 [pin 29] - NC [pin 22] - NC [pin 21] - NC [pin 19] - NC [pin 20] - NC [pin 18] - NC [pin 17] - NC [pin 32] - RXD0 [pin 34] - SENSOR_VN [pin 5] - SENSOR_VP [pin 4] - TXD0 [pin 35] ### J1 — [KF128-5.08-2P-AA](https://www.flux.ai/lcsc/kf128-5p08-2p-aa~0pbi.md) - Role: Motherboard PWR_SW isolated output terminal - Current Rating: 24A - Connector Positions: 2 - Connector Pitch: 5.08mm - Package or Case Code: CONN-TH_P5.08_KF128-5.08-2P - LCSC Part Number: C474952 - JLCPCB Part Class: Extended Part - Connector Gender: Female - Manufacturer Name: KEFA(科发) - Connector Type: Screw terminal - Connector Rows: 1 - Product Info Url: https://lcsc.com/product-detail/New-Quadratic-Unclassified-Data_Cixi-Kefa-Elec-KF128-5-08-2P_C474952.html - Manufacturer Part Number: KF128-5.08-2P-AA - Operating Temperature: -40℃~+105℃ - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2408211511_Cixi-Kefa-Elec-KF128-5-08-2P-AA_C474952.pdf - Part Type: Screw terminal **Pins:** - 1 [pin 1] - 2 [pin 2] ### LED1 — [BZ-C0603-G3-F1](https://www.flux.ai/lcsc/bz-c0603-g3-f1~v6dg.md) - Package or Case Code: LED0603-R-RD_GREEN - JLCPCB Part Class: Extended Part - Role: Optional GPIO status indicator - LCSC Part Number: C2833058 - Datasheet URL: https://www.lcsc.com/datasheet/C2833058.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: BZ-C0603-G3-F1 - Manufacturer Name: baizou(百洲) - Part Type: Light Emitting Diodes (LED) **Pins:** - A [pin 1] - K [pin 2] ### PC817 — [PC817C](https://www.flux.ai/lcsc/pc817c~olct.md) - Max Forward Current: 50mA - Product Info Url: https://lcsc.com/product-detail/DIP-Optocouplers_PC817C_C115500.html - Manufacturer Name: 华润华晶 - Max Reverse Voltage: 5V - Role: Optocoupler isolated switch - LCSC Part Number: C115500 - Forward Voltage Drop: 1.2V - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1809251512_Wuxi-China-Resources-Huajing-Microelectronics-PC817C_C115500.pdf - JLCPCB Part Class: Extended Part - Manufacturer Part Number: PC817C - Package or Case Code: DIP-4_L4.6-W6.5-P2.54-LS7.6-BL - Part Type: Optocouplers - Phototransistor Output **Pins:** - AN [pin 1] - CAT [pin 2] - COL [pin 4] - EM [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/sivakami22/wifi-pc-power-switch~cn](https://www.flux.ai/sivakami22/wifi-pc-power-switch~cn).* --- *Generated from [https://www.flux.ai/sivakami22/wifi-pc-power-switch~cn](https://www.flux.ai/sivakami22/wifi-pc-power-switch~cn)*