RamRamAndroid/GeoTinker-CodeMatrixThe GeoTinker GL868_ESP32 is a production-ready, open-source development board that combines an ESP32-S3 and SIM868 GSM modem, with GPS Tracking, motion detection, battery management, wireless connectivity (Bluetooth/Wifi) and cellular monitoring (GPRS/SMS/Calls) on a compact PCB.
GL868 ESP32V3.1 is an open-source printed circuit board by RamRamAndroid, from the RamRamAndroid/GeoTinker-CodeMatrix repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 33 × 85 mm with 79 parts on 127 nets, routed with 830 tracks and 237 vias.
It is built around the ESP32-S3-MINI-1-N8, SIM868 and BQ24073RGTR, with the SPX3819M5-L-3-3/TR, TXB0102DCU and PDTC114EU,115-JSM among its other parts. Its parts include 24 resistors, 16 capacitors, 7 ICs, 6 diodes and 6 connectors. It belongs with the radio and wireless and power boards and the ESP32 boards of this library.
The GeoTinker GL868_ESP32 is a production-ready, open-source development board that combines an ESP32-S3 and SIM868 GSM modem, with GPS Tracking, motion detection, battery management, wireless connectivity (Bluetooth/Wifi) and cellular monitoring (GPRS/SMS/Calls) on a compact PCB. It targets asset tracking, vehicle monitoring, anti-theft systems, and any IoT application that needs cellular monitoring or control, along with location tracking.
The board ships readily supported by GeoLinker GPS tracking dashabord allowing you to track and visualise data on a map right out of the box for quick prototyping. For further developement you can use the open-source GL868_ESP32 Arduino library, which provides a high-level, non-blocking API for GPS tracking, HTTP data upload, SMS command processing, voice call handling, and deep-sleep power management.
Unlike normal GPS shields or modules, which require wiring and separate power management, the GL868_ESP32 is an all-in-one hardware platform. It integrates a BQ24073 battery charger, a dedicated LIS3DHTR 3-axis accelerometer for motion-triggered wake-up, a TXB0102 logic-level translator, an addressable RGB LED, 4 more status LEDs, onboard dual antenna for GSM and GNSS, a USB-C programming port, and a nano-SIM card slot, everything needed for your GPS tracking and remote monitoring projects.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | LOGO | GL868_ESP32:LOGO | G***, G***, G***, G***, G***, G***, G***, G***, G*** |
| 6 | 22R | GL868_ESP32:R_0402_1005Metric | R13, R14, R22, R23, R24, R25 |
| 6 | 4.7K | GL868_ESP32:R_0402_1005Metric | R8, R9, R10, R11, R16, R17 |
| 5 | 100nF | GL868_ESP32:C_0402_1005Metric | C2, C8, C9, C12, C13 |
| 4 | 1K | GL868_ESP32:R_0402_1005Metric | R12, R15, R19, R20 |
| 2 | 1.5K | GL868_ESP32:R_0402_1005Metric | R6, R7 |
| 2 | 10K | GL868_ESP32:R_0402_1005Metric | R5, R21 |
| 2 | 10uF | GL868_ESP32:C_0402_1005Metric | C6, C11 |
| 2 | 4.7uF | GL868_ESP32:C_0402_1005Metric | C1, C3 |
| 2 | 5K1 | GL868_ESP32:R_0402_1005Metric | R1, R2 |
| 2 | Conn_01x06 | GL868_ESP32:PinHeader_1x06_P2.54mm_Vertical | J4, J5 |
| 2 | Conn_01x10 | GL868_ESP32:PinHeader_1x10_P2.54mm_Vertical | J2, J3 |
| 2 | Green LED | GL868_ESP32:LED_0603_1608Metric | D2, D4 |
| 2 | MountingHole | GL868_ESP32:MountingHole_2.2mm_M2_DIN965 | H1, H2 |
| 2 | SW_Push | GL868_ESP32:Tactile 3x4x2mm TS-A010 | SW1, SW2 |
| 1 | 0.6pf | GL868_ESP32:C_0402_1005Metric | C16 |
| 1 | 1.1K | GL868_ESP32:R_0402_1005Metric | R3 |
| 1 | 1.8K | GL868_ESP32:R_0402_1005Metric | R4 |
| 1 | 100uF | GL868_ESP32:CP_EIA-3528-15_AVX-H | C10 |
| 1 | 10nF | GL868_ESP32:C_0402_1005Metric | C4 |
| 1 | 10uf | GL868_ESP32:C_0402_1005Metric | C7 |
| 1 | 13nH | GL868_ESP32:L_0402_1005Metric | L1 |
| 1 | 1N5819 | GL868_ESP32:D_SOD-523 | D3 |
| 1 | 2.2uF | GL868_ESP32:C_0402_1005Metric | C5 |
| 1 | 2.3pf | GL868_ESP32:C_0402_1005Metric | C15 |
| 1 | 4.2pf | GL868_ESP32:C_0402_1005Metric | C14 |
| 1 | 5nH | GL868_ESP32:L_0402_1005Metric | L2 |
| 1 | 7.1nH | GL868_ESP32:L_0402_1005Metric | L3 |
| 1 | ANT | GL868_ESP32:GL868_Combo_ANT | ANT1 |
| 1 | BQ24073RGTR | GL868_ESP32:IC_BQ24072RGTR | U1 |
| 1 | Blue LED | GL868_ESP32:LED_0603_1608Metric | LED2 |
| 1 | Conn_01x02 | GL868_ESP32:CONN-SMD_2P-P2.50_HCTL_HC-XH-2ALT | J6 |
| 1 | ESP32-S3-MINI-1 | GL868_ESP32:ESP32-S2-MINI-1 | U4 |
| 1 | LIS3DHTR | GL868_ESP32:LIS3DHTR | U5 |
| 1 | LOGO | LOGO | G*** |
| 1 | PDTC114EU,115 | GL868_ESP32:PDTC114EU115 | Q1 |
| 1 | Red LED | GL868_ESP32:LED_0603_1608Metric | LED1 |
| 1 | SIM868 | GL868_ESP32:SIM868 | U7 |
| 1 | SMN-303 | GL868_ESP32:SIM-SMD_SMN-303 | CARD1 |
| 1 | SPX3819M5-L-3-3/TR | GL868_ESP32:SOT-23-5 | U2 |
| 1 | TPS22919DCKR | GL868_ESP32:SOT65P210X110-6N | U3 |
| 1 | TXB0102DCU | GL868_ESP32:VSSOP-8_2.3x2mm_P0.5mm | U6 |
| 1 | USB_C_Receptacle_USB2.0 | GL868_ESP32:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | WS2812B-2020 | GL868_ESP32:LED_WS2812B-2020_PLCC4_2.0x2.0mm | D1 |
It measures 33 × 85 mm and has 2 copper layers, 1.6 mm thick.
79 parts, built around the ESP32-S3-MINI-1-N8, SIM868, BQ24073RGTR and SPX3819M5-L-3-3/TR. 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 RamRamAndroid/GeoTinker-CodeMatrix repository on GitHub, at the commit this page was made from: the board is KiCad Files/GL868_ESP32V3.1.kicad_pcb and its schematic KiCad Files/GL868_ESP32V3.1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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