# Slight Scarlet Pip boy ## Description Ultra-Compact 2-Layer ESP32-C3 Control PCB for BCOTI V2_Beta with USB-C Power, USB-A Data, CV256 Mini2, LZE039, Button Header, and Pot-Based Brightness Control ## Project Details - **Owner:** johnchris - **Created:** 12/1/2025 - **Last Updated:** 12/1/2025 - **Visibility:** Public - **ERC Review Findings:** No missing decoupling capacitors detected. Both C1 and C2 are present but lack a defined voltage rating property. No pull-up or pull-down resistor issues found. - **J5_Width:** 10.46 mm - **Max_Connector_Clearance:** 6mm - **Connector Clearances:** USB-C J1: keep-out 0.75 mm inward from board edge along shell outline; USB-A J2: keep-out 1.00 mm inward from board edge along mouth, maintain full 6.0 mm shell overhang beyond PCB edge; CV256 Mini2 J3 (JST B5B-XH-A): at least 1.50 mm from board edge to plastic front wall; LZE039 J4 (AVR-ISP-10): at least 1.50 mm from board edge to first pin row; Button header J5 (61300411121): at least 1.50 mm from board edge to pin centerline; Pot SW1 (PTR902-2015K-A104): at least 2.00 mm from board edge on all sides of knob body, and 3.00 mm radial clearance around shaft projection. - **C2 Voltage Rating Status:** Missing Voltage Rating property; must be specified before release. - **DRC Review Findings:** No missing footprints detected. - **SW1_Width:** 15.8mm - **J4_Height:** 20.325 mm - **J1_Height:** 5mm - **J5_Height:** 2.74 mm - **J1_Width:** 10.2mm - **J2_Width:** 18.8mm - **C1 Voltage Rating Status:** Missing Voltage Rating property; must be specified before release. - **J2_Height:** 7mm - **J2_Overhang:** 6mm - **Board_Width:** 91mm - **J3_Width:** 14.825 mm - **J5_Overhang:** 1.42 mm - **J4_Width:** 8.90 mm - **J4_Overhang:** 5.10 mm - **SW1_Overhang:** 6.25 mm - **J1_Overhang:** 2.3mm - **SW1_Height:** 15.8mm - **System Architecture:** ```mermaid graph LR USB_Power(USB-C Power) USB_Data(USB-A Data) ESP32(ESP32-C3) CV256(CV256 Mini2) LZE039(LZE039) Buttons(Button Array) Pot(Potentiometer/Switch) USB_Power --> ESP32 USB_Power --> CV256 USB_Power --> LZE039 USB_Data --> ESP32 ESP32 --> CV256 ESP32 --> LZE039 ESP32 --> Buttons ESP32 --> Pot ``` - **Board_Height:** 62.625mm - **J3_Overhang:** 2.35 mm - **J3_Height:** 5.75 mm ## Key Components ### J1 — [Type-C-2.0-6Pin](https://www.flux.ai/jharwinbarrozo/type-c-2p0-6pin~wh.md) - Datasheet URL: https://datasheet.lcsc.com/lcsc/2204071830_CIKI-Type-C-2-0-6Pin_C2987385.pdf - Role Details: USB-C 4-wire power input - Manufacturer Part Number: Type-C-2.0-6Pin - Manufacturer Name: CIKI - Role: Power Source - Part Type: Connector **Pins:** - CC1 - CC2 - GND - GND__1 - SHIELD - SHIELD__1 - SHIELD__2 - SHIELD__3 - V-BUS - V-BUS__1 ### J2 — [0480371000](https://www.flux.ai/adrian95/0480371000~w0.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Molex - Role Details: USB Type-A male data interface (D+/D-) - Manufacturer Part Number: 0480371000 - Datasheet URL: https://www.molex.com/pdm_docs/sd/480371000_sd.pdf - Role: Connector **Pins:** - D- [pin 2] - D+ [pin 3] - GND [pin 4] - SHIELD [pin S2] - SHIELD [pin S1] - VCC [pin 1] ### J3 — [B5B-XH-A(LF)(SN)](https://www.flux.ai/lcsc/b5b-xh-alfsn~05rh.md) - Gender: Male Pin - Role: Connector - Role Details: CV256 Mini2 5-pin (R, T, C, G, V) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B5B-XH-A-LF-SN_C157991.pdf - Manufacturer Name: JST - Positions: 5 - JLCPCB Part Class: Extended Part - Manufacturer Part Number: B5B-XH-A(LF)(SN) - Connector Type: Headers and Wire Housings - Pitch: 0.098" (2.50mm) - LCSC Part Number: C157991 - Part Type: Connector - Connector Positions: 5 - Package or Case Code: CONN-TH_B5B-XH-A-LF-SN - PinMapping: R, T, C, G, V - Rows: 1 - Product Info Url: https://lcsc.com/product-detail/XH-Connectors_JST_B5B-XH-A-LF-SN_XHsocket-1-5P-pitch2-5mm_C157991.html **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### J4 — [AVR-ISP-10 with text](https://www.flux.ai/vasy_skral/avr-isp-10-with-text~snf.md) - Connector Type: Audio / Video Connectors - Manufacturer Name: Würth Elektronik - Datasheet URL: https://www.we-online.com/catalog/datasheet/61201021621.pdf - Manufacturer Part Number: 61201021621 - Part Type: Connector - Connector Positions: 6 - Role: Connector - PinMapping: CVBS+,CVBS-,Bright+,Bright-,5V,GND - Role Details: LZE039 10-pin connector for CVBS±, brightness±, 5V, and GND **Pins:** - ~RST [pin 5] - GND [pin 10] - GND [pin 8] - GND [pin 6] - GND [pin 4] - MISO [pin 9] - MOSI [pin 1] - NC [pin 3] - SCK [pin 7] - VCC [pin 2] ### J5 — [61300411121](https://www.flux.ai/adrian95/61300411121~pw9.md) - Datasheet URL: https://www.we-online.com/components/products/datasheet/61300411121.pdf - Role Details: 4-pin button header: 3 GPIO pins plus KCOM to GND - Manufacturer Part Number: 61300411121 - Role: Connector - Package or Case Code: HDRV4W95P0X254_1X4_1016X254X854P - Manufacturer Name: Wurth Elektronik - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### SW1 — [PTR902-2015K-A104](https://www.flux.ai/jecstronic/ptr902-2015k-a104~709.md) - Datasheet URL: https://www.bourns.com/docs/Product-Datasheets/PTR90.pdf - Resistance: 100kΩ - Manufacturer Name: Texas Instruments Inc. - Part Type: Potentiometer - License: https://creativecommons.org/licenses/by/4.0/ - Role: Voltage Division - Role Details: Brightness control potentiometer with integrated on/off switch; wiper to GPIO4 - Manufacturer Part Number: PTR902-2015K-A104 **Pins:** - R1_1 [pin 1] - R1_2 [pin 2] - R1_3 [pin 3] - R2_1 [pin 4] - R2_2 [pin 5] - R2_3 [pin 6] - SW_1 [pin 7] - SW_2 [pin 8] ### TP1 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role: Test Point - Role Details: Test pad for net 5V - Package: SMD **Pins:** - P1 ### TP2 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Package: SMD - Role Details: Test pad for net GND - Role: Test Point **Pins:** - P1 ### TP3 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Package: SMD - Role Details: Test pad for net CVBS - Role: Test Point **Pins:** - P1 ### TP4 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role: Test Point - Role Details: Test pad for net UART_TX - Package: SMD **Pins:** - P1 ### TP5 — [1.25mm SMD Test Point](https://www.flux.ai/jharwinbarrozo/1p25mm-smd-test-point~b9.md) - Role: Test Point - Role Details: Test pad for net UART_RX - Package: SMD **Pins:** - P1 ### U1 — [ESP32-C3 SuperMini](https://www.flux.ai/jecstronic/esp32-c3-supermini~pzl.md) - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-mini-1_datasheet_en.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Texas Instruments Inc. - Role Details: Main MCU with exposed 5V, 3V3, GND, GPIO, UART, and brightness control pins - Part Type: Module - Manufacturer Part Number: ESP32-C3_SUPERMINI **Pins:** - 3V3 [pin 3.3] - 5V [pin 5V] - GND [pin G] - GPIO0 [pin 0] - GPIO1 [pin 1] - GPIO10 [pin 10] - GPIO2 [pin 2] - GPIO20 [pin 20] - GPIO21 [pin 21] - GPIO3 [pin 3] - GPIO4 [pin 4] - GPIO5 [pin 5] - GPIO6 [pin 6] - GPIO7 [pin 7] - GPIO8 [pin 8] - GPIO9 [pin 9] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/johnchris/slight-scarlet-pip-boy~2p](https://www.flux.ai/johnchris/slight-scarlet-pip-boy~2p).* --- *Generated from [https://www.flux.ai/johnchris/slight-scarlet-pip-boy~2p](https://www.flux.ai/johnchris/slight-scarlet-pip-boy~2p)*