# Statistical Aqua Liquid Breathing Apparatus ## Description Credit Card GPS + GSM Tracker (ESP32 + A9G) ## Project Details - **Owner:** vinayakuniyal - **Created:** 2/17/2026 - **Last Updated:** 2/17/2026 - **Visibility:** Public - **System Architecture:** flowchart TD PWR_IN["USB-C 5V In"] --> CHG["LiPo Charger IC"] CHG --> BAT["LiPo 1S 2000mAh"] BAT --> PROT["Battery Protection DW01A+FS8205A"] PROT --> SYSBAT["SYS_BAT Rail"] SYSBAT --> LDO33["3.3V LDO"] LDO33 --> V33["3V3 Rail"] SYSBAT --> A9G_SW["A9G High-side P-MOS Switch"] A9G_SW --> A9G["A9G GSM+GPS Module"] V33 --> ESP32["ESP32 Module"] V33 --> UART["USB-UART Bridge"] UART -->|"UART0"| ESP32 ESP32 -->|"GPIO16/17 UART2"| A9G A9G --> RF_GSM["U.FL GSM Ant"] A9G --> RF_GPS["U.FL GPS Ant"] ESP32 --> RF_WIFI["U.FL WiFi Ant"] A9G --> SIM["Nano SIM Socket"] A9G --> BIAS_T["GPS Active Ant Bias-T"] ESP32 --> DBG["Buttons + Test Pads + User LED"] - **Copies:** 1 ## Key Components ### D1 — [USBLC6-2SC6Y](https://www.flux.ai/adrian95/usblc6-2sc6y.md) - Manufacturer Name: STMicroelectronics - Manufacturer Part Number: USBLC6-2SC6Y - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/group0/94/15/6c/58/ba/91/46/42/DM00055262/files/DM00055262.pdf/jcr:content/translations/en.DM00055262.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Protection **Pins:** - GND [pin 2] - I/O1 [pin 6] - I/O1 [pin 1] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D2 — [PRTR5V0U2X,215](https://www.flux.ai/openpartlist/prtr5v0u2xc215.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://assets.nexperia.com/documents/data-sheet/PRTR5V0U2X.pdf - Part Type: Protection - Manufacturer Name: Nexperia USA Inc. - Manufacturer Part Number: PRTR5V0U2X,215 **Pins:** - GND [pin 1] - I/O1 [pin 2] - I/O2 [pin 3] - VCC [pin 4] ### D3 — [SMBJ5.0A-TR](https://www.flux.ai/lcsc/smbj5p0a-tr.md) - Manufacturer Part Number: SMBJ5.0A-TR - Product Info Url: https://lcsc.com/product-detail/TVS_STMicroelectronics_SMBJ5-0A-TR_SMBJ5-0A-TR_C130397.html - Part Type: TVS - LCSC Part Number: C130397 - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - Manufacturer Name: ST(意法半导体) - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_STMicroelectronics-SMBJ5-0A-TR_C130397.pdf **Pins:** - A [pin 2] - K [pin 1] ### D4 — [PRTR5V0U2X,215](https://www.flux.ai/openpartlist/prtr5v0u2xc215.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Protection - Datasheet URL: https://assets.nexperia.com/documents/data-sheet/PRTR5V0U2X.pdf - Manufacturer Part Number: PRTR5V0U2X,215 - Manufacturer Name: Nexperia USA Inc. **Pins:** - GND [pin 1] - I/O1 [pin 2] - I/O2 [pin 3] - VCC [pin 4] ### FB1 — [BLM18AG121SN1D](https://www.flux.ai/jecstronic/blm18ag121sn1d.md) - Manufacturer Name: Murata Electronics - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.murata.com/en-us/products/productdata/8796738650142/ENFA0003.pdf - Manufacturer Part Number: BLM18AG121SN1D - Part Type: Filter **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a.md) - Manufacturer Name: GCT - Manufacturer Name: GCT - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: USB C - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5492/USB4105.pdf - Manufacturer Part Number: USB4105-GF-A **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin A1_B12] - GND__1 [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHELL_GND [pin SH1] - SHELL_GND__1 [pin SH2] - SHELL_GND__2 [pin SH3] - SHELL_GND__3 [pin SH4] - VBUS [pin A4_B9] - VBUS__1 [pin B4_A9] ### J2 — [B2B-PH-K-S(LF)(SN)](https://www.flux.ai/jecstronic/b2b-ph-k-slfsn.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: B2B-PH-K-S(LF)(SN) - Datasheet URL: https://datasheet.lcsc.com/lcsc/1811151524_JST-Sales-America-B2B-PH-K-S-LF-SN_C131337.pdf - Part Type: Connector - Manufacturer Name: JST Sales America **Pins:** - PIN1 [pin 1] - PIN2 [pin 2] ### J3 — [SIM8060-6-0-14-00-A](https://www.flux.ai/adrian95/sim8060-6-0-14-00-a.md) - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: SIM8060601400A - Part Type: Connector - Datasheet URL: https://gct.co/files/drawings/sim8060.pdf - Manufacturer Part Number: SIM8060-6-0-14-00-A - Manufacturer Name: GCT (GLOBAL CONNECTOR TECHNOLOGY) **Pins:** - CLK [pin C3] - GND_1 [pin C5] - GND_2 [pin G1] - GND_3 [pin G2] - GND_4 [pin G3] - GND_5 [pin G4] - I/O [pin C7] - RST [pin C2] - VCC [pin C1] - VPP [pin C6] ### J4 — [U.FL-R-SMT-1(10)](https://www.flux.ai/jecstronic/upfl-r-smt-110.md) - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Hirose%20PDFs/EDC3-302540-10.tif.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Hirose Electric Co Ltd - Part Type: Connector - Manufacturer Part Number: U.FL-R-SMT-1(10) **Pins:** - Center_Contact [pin 2] - Outer_Contact [pin 1] - Outer_Contact [pin 3] ### J6 — [U.FL-R-SMT-1(10)](https://www.flux.ai/jecstronic/upfl-r-smt-110.md) - Part Type: Connector - Manufacturer Part Number: U.FL-R-SMT-1(10) - Manufacturer Name: Hirose Electric Co Ltd - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Hirose%20PDFs/EDC3-302540-10.tif.pdf **Pins:** - Center_Contact [pin 2] - Outer_Contact [pin 1] - Outer_Contact [pin 3] ### LED1 — [VLMB1500-GS08](https://www.flux.ai/lcsc/vlmb1500-gs08.md) - Manufacturer Part Number: VLMB1500-GS08 - Package or Case Code: LED0402-RD_BLUE - JLCPCB Part Class: Extended Part - Part Type: Light Emitting Diodes (LED) - Manufacturer Name: VISHAY(威世) - LCSC Part Number: C511042 - Product Info Url: https://lcsc.com/product-detail/Light-Emitting-Diodes-LED_Vishay-Intertech-VLMB1500-GS08_C511042.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Vishay-Intertech-VLMB1500-GS08_C511042.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] ### LED2 — [LNJ347W83RA](https://www.flux.ai/adrian95/lnj347w83ra.md) - Part Type: LED - Manufacturer Part Number: LNJ347W83RA - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Panasonic Electronic Components - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/4055/LNJ347W83RA.pdf **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [VLMS1500-GS08](https://www.flux.ai/adrian95/vlms1500-gs08.md) - Manufacturer Name: Vishay Semiconductor Opto Division - Datasheet URL: https://www.vishay.com/docs/82554/vlmo1500.pdf - Manufacturer Part Number: VLMS1500-GS08 - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### Q1 — [FS8205A](https://www.flux.ai/lcsc/fs8205a.md) - Manufacturer Part Number: FS8205A - Manufacturer Name: TECH PUBLIC(台舟) - Part Type: MOSFETs - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR - JLCPCB Part Class: Extended Part - LCSC Part Number: C2830320 **Pins:** - D1/D2 [pin 5] - D1/D2 [pin 2] - G1 [pin 6] - G2 [pin 4] - S1 [pin 1] - S2 [pin 3] ### Q2 — [MMBT3904LT3G](https://www.flux.ai/lcsc/mmbt3904lt3g.md) - JLCPCB Part Class: Extended Part - Part Type: Bipolar Transistors - BJT - Manufacturer Name: onsemi(安森美) - Product Info Url: https://lcsc.com/product-detail/Transistors-NPN-PNP_ON-Semicon_MMBT3904LT3G_ON-Semicon-ON-MMBT3904LT3G_C150052.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810301515_onsemi-MMBT3904LT3G_C150052.pdf - LCSC Part Number: C150052 - Package or Case Code: SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR - Manufacturer Part Number: MMBT3904LT3G **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### Q3 — [MMBT3904LT3G](https://www.flux.ai/lcsc/mmbt3904lt3g.md) - Manufacturer Part Number: MMBT3904LT3G - Package or Case Code: SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR - LCSC Part Number: C150052 - Manufacturer Name: onsemi(安森美) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/1810301515_onsemi-MMBT3904LT3G_C150052.pdf - Product Info Url: https://lcsc.com/product-detail/Transistors-NPN-PNP_ON-Semicon_MMBT3904LT3G_ON-Semicon-ON-MMBT3904LT3G_C150052.html - Part Type: Bipolar Transistors - BJT - JLCPCB Part Class: Extended Part **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### Q4 — [AO3401A](https://www.flux.ai/jecstronic/ao3401a.md) - Part Type: Transistor - Manufacturer Part Number: AO3401A - Manufacturer Name: HUASHUO - Datasheet URL: https://www.lcsc.com/datasheet/lcsc_datasheet_2007171935_HUASHUO-AO3401A_C700954.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - D [pin 3] - G [pin 1] - S [pin 2] ### SW1 — [HX 3x4x2-2P-1.6N TACTILE SWITCH](https://www.flux.ai/adrian95/hx-3x4x2-2p-1p6n-tactile-switch.md) - LCSC Part Number: C49234124 - Manufacturer Part Number: HX 3x4x2-2P-1.6N TACTILE SWITCH - Part Type: Switch - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.lcsc.com/datasheet/C49234124.pdf - Manufacturer Name: hanxia **Pins:** - ~ [pin 1B] - ~ [pin 1A] ### SW2 — [HX 3x4x2-2P-1.6N TACTILE SWITCH](https://www.flux.ai/adrian95/hx-3x4x2-2p-1p6n-tactile-switch.md) - Manufacturer Part Number: HX 3x4x2-2P-1.6N TACTILE SWITCH - LCSC Part Number: C49234124 - Datasheet URL: https://www.lcsc.com/datasheet/C49234124.pdf - Manufacturer Name: hanxia - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Switch **Pins:** - ~ [pin 1B] - ~ [pin 1A] ### U1 — [ESP32-WROOM-32U](https://www.flux.ai/kicad-part-library/esp32-wroom-32u.md) - Manufacturer Part Number: ESP32-WROOM-32U - Package or Case Code: ESP32-WROOM-32U - Manufacturer Name: Texas Instruments Inc. - Part Type: RF Module - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf **Pins:** - EN [pin 3] - GND [pin 39] - GND [pin 15] - GND [pin 1] - GND [pin 38] - 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 32] - RXD0/IO3 [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/IO1 [pin 35] - VDD [pin 2] ### U2 — [A9G](https://www.flux.ai/lcsc/a9g.md) - Manufacturer Part Number: A9G - Part Type: 2G/3G/4G/5G Modules - LCSC Part Number: C133738 - JLCPCB Part Class: Extended Part - Package or Case Code: GSM-SMD_A9-GSM-GPRSMODULE - Manufacturer Name: Ai-Thinker(安信可) **Pins:** - ADC0 [pin 15] - ADC1 [pin 16] - EP1 [pin 55] - EP2 [pin 56] - GND [pin 29] - GND [pin 10] - GND [pin 46] - GND [pin 44] - GND [pin 27] - GPRS_RF [pin 45] - GPS_CTS [pin 48] - GPS_RF [pin 28] - GPS_RTS [pin 47] - GPS_RXD [pin 50] - GPS_TXD [pin 49] - HST_RXD [pin 38] - HST_TXD [pin 37] - I2C2_SCL [pin 1] - I2C2_SDA [pin 2] - IO25 [pin 32] - IO26 [pin 25] - IO27 [pin 26] - IO28 [pin 30] - IO29 [pin 24] - IO30 [pin 31] - LCD_CS [pin 19] - LCD_DIO [pin 21] - LCD_RST [pin 20] - LCD_SCK [pin 23] - LCD_SDO [pin 22] - MIC_N [pin 33] - MIC_P [pin 34] - PWRKEY [pin 9] - RESET [pin 18] - SD_CLK [pin 8] - SD_CMD [pin 7] - SD_D0 [pin 6] - SD_D1 [pin 5] - SD_D2 [pin 4] - SD_D3 [pin 3] - SIMD_CLK [pin 41] - SIMD_DIO [pin 39] - SIMD_RST [pin 42] - SPK_N [pin 14] - SPK_P [pin 13] - UART1_CTS [pin 52] - UART1_RTS [pin 51] - UART1_RXD [pin 53] - UART1_TXD [pin 54] - USB_N [pin 35] - USB_P [pin 36] - VBAT [pin 12] - VBAT [pin 11] - VBUS [pin 17] - VIO [pin 43] - VSIMD [pin 40] ### U3 — [TP4056](https://www.flux.ai/lcsc/tp4056.md) - LCSC Part Number: C725790 - Part Type: Battery Management ICs - JLCPCB Part Class: Extended Part - Manufacturer Part Number: TP4056 - Package or Case Code: ESOP-8_L4.9-W3.9-P1.27-LS6.0-BL-EP - Product Info Url: https://lcsc.com/product-detail/PMIC-Battery-Management_UMW-Youtai-Semiconductor-Co-Ltd-TP4056_C725790.html - Manufacturer Name: UMW(友台半导体) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409241408_UMW-Youtai-Semiconductor-Co---Ltd--TP4056_C725790.pdf **Pins:** - ~{CHRG} [pin 7] - ~{STDBY} [pin 6] - BAT [pin 5] - CE [pin 8] - EP [pin 9] - GND [pin 3] - PROG [pin 2] - TEMP [pin 1] - VCC [pin 4] ### U4 — [DW01A](https://www.flux.ai/lcsc/dw01a.md) - Part Type: Battery Management ICs - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL - Manufacturer Part Number: DW01A - Manufacturer Name: YONGYUTAI(永裕泰) - LCSC Part Number: C2927799 - JLCPCB Part Class: Extended Part **Pins:** - CSI [pin 2] - NC [pin 4] - OC [pin 3] - OD [pin 1] - VDD [pin 5] - VSS [pin 6] ### U5 — [AMS1117-3.3](https://www.flux.ai/adrian95/ams1117-33.md) - Part Type: Integrated Circuit - Datasheet URL: https://www.snapeda.com/parts/AMS1117-3.3/Advanced%20Monolithic%20Systems/view-part/?ref=search&t=AMS1117-3.3 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: ams - Manufacturer Part Number: AMS1117-3.3 **Pins:** - GND [pin 1] - VI [pin 3] - VO [pin 2] ### U6 — [CH340C](https://www.flux.ai/vasy_skral/ch340c.md) - Manufacturer Name: Wah - Manufacturer Part Number: CH340C - Datasheet URL: https://datasheet.lcsc.com/szlcsc/Jiangsu-Qin-Heng-CH340C_C84681.pdf - Part Type: Integrated Circuit **Pins:** - ~CTS [pin 9] - ~DCD [pin 12] - ~DSR [pin 10] - ~DTR [pin 13] - ~RI [pin 11] - ~RTS [pin 14] - GND [pin 1] - NC [pin 7] - NC [pin 8] - R232 [pin 15] - RXD [pin 3] - TXD [pin 2] - UD- [pin 6] - UD+ [pin 5] - V3 [pin 4] - VCC [pin 16] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/vinayakuniyal/statistical-aqua-liquid-breathing-apparatus](https://www.flux.ai/vinayakuniyal/statistical-aqua-liquid-breathing-apparatus).* --- *Generated from [https://www.flux.ai/vinayakuniyal/statistical-aqua-liquid-breathing-apparatus](https://www.flux.ai/vinayakuniyal/statistical-aqua-liquid-breathing-apparatus)*