I always dreamed of building my own mobile system. This repo documents my journey designing a custom ESP32 PCB featuring a GSM module, display interface, and complete Battery Management System (BMS). Each subsystem was designed in KiCad and independently tested. I'm currently working on sourcing a suitable display to complete the final integration.
MOBILE is an open-source printed circuit board by sumit123hub, from the sumit123hub/Mobile-PCB-Files- repository on GitHub. It is a 2-layer board of 128.7 × 60.3 mm with 92 parts on 111 nets, routed with 493 tracks and 28 vias.
It is built around the ESP32-WROOM-32E-N8R2, ME2199ASG and AMS1117-3.3, with the BQ24073RGTR, CKCS6045-6.8UH/M and MWSA0603S-4R7MT among its other parts. Its parts include 45 capacitors, 26 resistors, 5 ICs, 4 diodes and 4 inductors. It belongs with the power and lEDs and displays boards and the ESP32 boards of this library.
I always dreamed of building my own mobile system. This repo documents my custom ESP32 PCB design featuring a GSM module, display interface, and a complete Battery Management System (BMS).
All subsystems were designed in KiCad and independently validated. Schematics, layout, and testing are complete—I'm just sourcing a suitable display for final integration.
| Front | Back |
|---|---|
 |  |
| KiCad View |
|---|
 |
| Component | Description |
|---|---|
| ESP32-WROOM | Main microcontroller (WiFi + BLE) |
| GSM Module | Quectel M65 module |
| Charging Circuit | BQ Chip |
| Display Interface | SPI for display and I2C for charhing |
Mobile_System.kicad_sch – SchematicMobile_System.kicad_pcb – PCB layoutgerbers/ – Manufacturing filesBOM.csv – Bill of MaterialsSumit Sigdel
GitHub: sumit123hub
| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 33pF | Capacitor_SMD:C_0805_2012Metric | C1, C9, C11, C13, C17, C21, C22, C23, C25, C31, C35, C43 |
| 11 | 22uF | Capacitor_SMD:C_0805_2012Metric | C2, C7, C10, C15, C19, C28, C33, C34, C37, C39, C41 |
| 10 | 100nF | Capacitor_SMD:C_0805_2012Metric | C3, C4, C6, C12, C14, C18, C20, C36, C38, C42 |
| 7 | 10K | Resistor_SMD:R_0603_1608Metric | R7, R8, R17, R18, R21, R24, R25 |
| 6 | 470uF | Capacitor_SMD:CP_Elec_6.3x7.7 | C8, C16, C27, C30, C32, C44 |
| 4 | 1K | Resistor_SMD:R_0603_1608Metric | R12, R22, R23, R26 |
| 3 | 22R | Resistor_SMD:R_0603_1608Metric | R9, R10, R11 |
| 3 | TAN 100uF | Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A | C24, C26, C29 |
| 2 | 100K | Resistor_SMD:R_0603_1608Metric | R16, R27 |
| 2 | 51K | Resistor_SMD:R_0603_1608Metric | R6, R19 |
| 2 | 5K1 | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 2 | CKCS6045-6.8UH/M | easyeda2kicad:IND-SMD_L6.0-W6.0 | L3, L4 |
| 2 | MWSA0603S-4R7MT | easyeda2kicad:IND-SMD_L7.0-W6.6 | L1, L2 |
| 2 | TAN 10uF | Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A | C5, C45 |
| 1 | 100R | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 1K1 | Resistor_SMD:R_0603_1608Metric | R20 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric | C40 |
| 1 | 27K | Resistor_SMD:R_0603_1608Metric | R14 |
| 1 | 2K2 | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 68K | Resistor_SMD:R_0603_1608Metric | R13 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U1 |
| 1 | AP3404 | easyeda2kicad:SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR-2 | Q3 |
| 1 | Antenna | RF_Antenna:Texas_SWRA416_868MHz_915MHz | AE1 |
| 1 | B540C-13-F | easyeda2kicad:SMC_L7.1-W6.2-LS8.1-RD | D2 |
| 1 | BQ24073RGTR | easyeda2kicad:QFN-16_L3.0-W3.0-P0.50-TL-EP1.7 | U5 |
| 1 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | ESP32-WROOM-32E-N8R2 | easyeda2kicad:WIFI-SMD_ESP32-WROOM-32E | U2 |
| 1 | FPC-05F-20PH20 | easyeda2kicad:touch_display_3.5inch | FPC1 |
| 1 | M65 | easyeda2kicad:XCVR_M65 | U3 |
| 1 | ME2199ASG | easyeda2kicad:SOP-8_L4.9-W3.9-P1.27-LS6.0-BL | U4 |
| 1 | MMBT3904_C181119 | easyeda2kicad:SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR | Q1 |
| 1 | SI2333 | easyeda2kicad:SOT-23_L2.9-W1.3-P1.90-LS2.4-BR | Q2 |
| 1 | SMC-202-6 | easyeda2kicad:SIM-SMD_SMC-202-6 | Card1 |
| 1 | SS34 | easyeda2kicad:DO-214AC_L4.3-W2.7-LS5.0-RD | D1 |
| 1 | TZ-P2-0602RTS2-1.2T | easyeda2kicad:LED-SMD_L1.6-W1.2-RD | LED2 |
| 1 | U262-061N-4BVC11 | easyeda2kicad:USB-SMD_U262-061N-4BVC11 | USB1 |
| 1 | XL-1606UGC | easyeda2kicad:LED-SMD_L1.7-W1.1-R-RD_GREEN | LED1 |
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Open, minimal sEMG wristband like the Meta Neural Band: 8-ch ADS1298 + nRF52832 BLE, dry gold electrodes on a flex, 3D-printed band. KiCad, FreeCAD, Zephyr, Python, simulations.
It measures 128.7 × 60.3 mm and has 2 copper layers, 1.6 mm thick.
92 parts, built around the ESP32-WROOM-32E-N8R2, ME2199ASG, AMS1117-3.3 and BQ24073RGTR. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the sumit123hub/Mobile-PCB-Files- repository on GitHub, at the commit this page was made from: the board is PCB_FILES/MOBILE.kicad_pcb and its schematic PCB_FILES/MOBILE.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask sumit123hub before reusing the design.