# SLOT PCB ## Description Slot-machine telemetry board with 5V or 12V input, removable ESP32 module interface, Ethernet connectivity, and isolated money pulse inputs. ## Project Details - **Owner:** muhammadali01 - **Created:** 4/28/2026 - **Last Updated:** 4/28/2026 - **Visibility:** Public ## Key Components ### D1 — [1N5819HW-7-F](https://www.flux.ai/jecstronic/1n5819hw-7-f~x5v.md) - Manufacturer Name: Diodes Incorporated - Manufacturer Part Number: 1N5819HW-7-F - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds30217.pdf - Role: Power OR Diode - Package: SOD-123 - Role Details: Schottky diode from 5V machine input to the shared 5V system rail - Part Type: Diode - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### D2 — [1N5819HW-7-F](https://www.flux.ai/jecstronic/1n5819hw-7-f~x5v.md) - Manufacturer Name: Diodes Incorporated - Datasheet URL: https://www.diodes.com/assets/Datasheets/ds30217.pdf - Manufacturer Part Number: 1N5819HW-7-F - Package: SOD-123 - Role: Power OR Diode - Part Type: Diode - Role Details: Schottky diode from buck output to the shared 5V system rail - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### D3 — [SMF5.0A](https://www.flux.ai/lcsc/smf5p0a~bz6b.md) - Role: ESD Protection - Part Type: TVS - Role Details: 5V TVS clamp on the shared 5V system rail - Package or Case Code: SOD-123FL_L2.8-W1.8-LS3.6-RD - LCSC Part Number: C2990427 - Max Reverse Voltage: 5V - Manufacturer Name: Liown(里阳半导体) - Forward Voltage: 0.45V to 0.55V (at 1A)V - JLCPCB Part Class: Extended Part - Package: SOD-123FL - Diode Type: Schottky Diode - Manufacturer Part Number: SMF5.0A **Pins:** - 1 [pin 1] - 2 [pin 2] ### D4 — [SMAJ12CA](https://www.flux.ai/lcsc/smaj12ca~g1r0.md) - Role: Surge Protection - Package: SMA - Forward Voltage: 1.0V to 1.3V - Product Info Url: https://lcsc.com/product-detail/TVS_Shikues-SMAJ12CA_C499826.html - JLCPCB Part Class: Extended Part - Manufacturer Part Number: SMAJ12CA - LCSC Part Number: C499826 - Diode Type: TVS Diode - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Shikues-SMAJ12CA_C499826.pdf - Reverse Voltage: 12V - Manufacturer Name: SHIKUES(时科) - Package or Case Code: SMA_L4.4-W2.6-LS5.0-BI - Role Details: 12V TVS clamp on the raw 12V machine input path - Part Type: TVS **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [B4B-XH-A(LF)(SN)](https://www.flux.ai/lcsc/b4b-xh-alfsn~so1x.md) - Manufacturer Name: JST - Rows: 1 - Manufacturer Part Number: B4B-XH-A(LF)(SN) - Package: JST XH 1x4 THT - Positions: 4 - JLCPCB Part Class: Extended Part - Role Details: Machine harness connector with GND, GND, 5V input, and 12V input positions - Product Info Url: https://lcsc.com/product-detail/_JST-Sales-America_B4B-XH-A-LF-SN_JST-Sales-America-B4B-XH-A-LF-SN_C144395.html - Package or Case Code: CONN-TH_B4B-XH-A-LF-SN - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B4B-XH-A-LF-SN_C144395.pdf - Pitch: 2.5mm - Role: Power Input Connector - Connector Type: Wire-to-board Header - Gender: Male - LCSC Part Number: C144395 - Part Type: Wire To Board / Wire To Wire Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J2 — [B2B-XH-A(LF)(SN)](https://www.flux.ai/lcsc/b2b-xh-alfsn~xrt.md) - Manufacturer Part Number: B2B-XH-A(LF)(SN) - Manufacturer Name: JST - Product Info Url: https://lcsc.com/product-detail/XH-Connectors_JST_B2B-XH-A-LF-SN_XHsocket-1-2P-pitch2-5mm_C158012.html - LCSC Part Number: C158012 - Role Details: Machine harness connector for money-in field pulse and return - Connector Type: Wire To Board / Wire To Wire Connector - Gender: Male - Pitch: 2.5mm - Rows: 1 - Role: Money-In Harness Connector - Package or Case Code: CONN-TH_B2B-XH-A-LF-SN - Positions: 2 - Package: JST XH 1x2 THT - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B2B-XH-A-LF-SN_C158012.pdf - Part Type: Wire To Board / Wire To Wire Connector - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 2 [pin 2] ### J5 — [B2B-XH-A(LF)(SN)](https://www.flux.ai/lcsc/b2b-xh-alfsn~xrt.md) - Role: Money-Out Harness Connector - Manufacturer Part Number: B2B-XH-A(LF)(SN) - Manufacturer Name: JST - Product Info Url: https://lcsc.com/product-detail/XH-Connectors_JST_B2B-XH-A-LF-SN_XHsocket-1-2P-pitch2-5mm_C158012.html - Connector Type: Wire To Board / Wire To Wire Connector - LCSC Part Number: C158012 - Role Details: Machine harness connector for money-out field pulse and return - Pitch: 2.5mm - Gender: Male - Positions: 2 - Package or Case Code: CONN-TH_B2B-XH-A-LF-SN - Rows: 1 - Package: JST XH 1x2 THT - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B2B-XH-A-LF-SN_C158012.pdf - Part Type: Wire To Board / Wire To Wire Connector - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 2 [pin 2] ### S1 — [PTS636 SM43J SMTR LFS](https://www.flux.ai/jharwinbarrozo/pts636-sm43j-smtr-lfs~6r0.md) - Package: SMD Tactile - Datasheet URL: https://www.ckswitches.com/media/2779/pts636.pdf - Manufacturer Name: C&K - Role Details: Momentary switch from ESP32 boot strap pin to ground - Role: Boot Button - Manufacturer Part Number: PTS636 SM43J SMTR LFS - Part Type: Switch **Pins:** - P1 [pin 1] - P2 [pin 2] ### S2 — [PTS636 SM43J SMTR LFS](https://www.flux.ai/jharwinbarrozo/pts636-sm43j-smtr-lfs~6r0.md) - Datasheet URL: https://www.ckswitches.com/media/2779/pts636.pdf - Role Details: Momentary switch from ESP32 enable/reset pin to ground - Package: SMD Tactile - Manufacturer Part Number: PTS636 SM43J SMTR LFS - Part Type: Switch - Role: Reset Button - Manufacturer Name: C&K **Pins:** - P1 [pin 1] - P2 [pin 2] ### U1 — [ESP32-WROOM-32D](https://www.flux.ai/vasy_skral/esp32-wroom-32d~o5t.md) - Manufacturer Part Number: ESP32-WROOM-32D - Part Type: Module - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Espressif Systems - Package: ESP32-WROOM-32D - Role: Wireless Telemetry Core - Symbol Style: parametric-v1 - Role Details: Fixed onboard ESP32 module providing WiFi communications, pulse counting, and service access **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND [pin 39_16] - GND [pin 39_14] - GND [pin 1] - GND [pin 39_17] - GND [pin 15] - GND [pin 39_12] - GND [pin 39_11] - GND [pin 39_5] - GND [pin 39_3] - GND [pin 39_13] - GND [pin 39_21] - GND [pin 38] - GND [pin 39_10] - GND [pin 39_19] - GND [pin 39_1] - GND [pin 39_6] - GND [pin 39_9] - GND [pin 39_18] - GND [pin 39_20] - GND [pin 39_7] - GND [pin 39_8] - GND [pin 39_4] - GND [pin 39_15] - GND [pin 39_2] - 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] - RXD0 [pin 34] - SCK/CLK [pin 20] - SCS/CMD [pin 19] - SDI/SD1 [pin 22] - SDO/SD0 [pin 21] - SENSOR_VN [pin 5] - SENSOR_VP [pin 4] - SHD/SD2 [pin 17] - SWP/SD3 [pin 18] - TXD0 [pin 35] ### U2 — [LMR50410Y5FQDBVRQ1](https://www.flux.ai/adrian95/lmr50410y5fqdbvrq1~tdn.md) - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: LMR50410Y5FQDBVRQ1 - Role Details: Wide-input fixed 5V buck converter for the 12V machine input path - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/lit/ds/symlink/lmr50410-q1.pdf - Package: SOT-23-6 - Symbol Style: parametric-v1 - Role: Buck Regulator **Pins:** - CB [pin 1] - EN [pin 4] - FB [pin 3] - GND [pin 2] - SW [pin 6] - VIN [pin 5] ### U3 — [PC817X2NSZ9F](https://www.flux.ai/adrian95/pc817x2nsz9f-8aiu3~i8d.md) - Manufacturer Name: SHARP/Socle Technology - Role Details: Money-in pulse isolation and level translation to ESP32 GPIO - Part Type: Isolator - Role: Opto-Isolated Input - Manufacturer Part Number: PC817X2NSZ9F - Package: DIP-4 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: http://www.socle-tech.com/doc/IC%20Channel%20Product/Optoelectronic%20Components/Photocoupler/PC817X_NSZ9FSeries_SPEC.pdf **Pins:** - ANODE [pin 1] - CATHODE [pin 2] - COLLECTOR [pin 4] - EMITTER [pin 3] ### U4 — [PC817X2NSZ9F](https://www.flux.ai/adrian95/pc817x2nsz9f-8aiu3~i8d.md) - Part Type: Isolator - Role: Opto-Isolated Input - Manufacturer Name: SHARP/Socle Technology - Package: DIP-4 - Datasheet URL: http://www.socle-tech.com/doc/IC%20Channel%20Product/Optoelectronic%20Components/Photocoupler/PC817X_NSZ9FSeries_SPEC.pdf - Manufacturer Part Number: PC817X2NSZ9F - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Money-out pulse isolation and level translation to ESP32 GPIO **Pins:** - ANODE [pin 1] - CATHODE [pin 2] - COLLECTOR [pin 4] - EMITTER [pin 3] ### U5 — [MCP1825S-3302E/DB](https://www.flux.ai/adrian95/mcp1825s-3302edb~3re.md) - Package: SOT-223-3 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip - Role Details: LDO regulator generating 3.3V for the fixed ESP32 and input pull-up network from SYS_5V - Package or Case Code: SOT230P700X180-4N - Datasheet URL: https://datasheet.datasheetarchive.com/originals/distributors/SFDatasheet-4/sf-00090042.pdf - Role: 3.3V Regulator - Manufacturer Part Number: MCP1825S-3302E/DB - Part Type: Power Management **Pins:** - GND_(TAB)_1 [pin 2] - GND_(TAB)_2 [pin 4] - VIN [pin 1] - VOUT [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/muhammadali01/slot-pcb~t7](https://www.flux.ai/muhammadali01/slot-pcb~t7).* --- *Generated from [https://www.flux.ai/muhammadali01/slot-pcb~t7](https://www.flux.ai/muhammadali01/slot-pcb~t7)*