Reference and testing
This reference covers the base Cerberus board: ESP32-S3 N16R2, one onboard ESP32-C5 with a 4 MB flash / no-PSRAM memory baseline, ST7796 display, GT911 touch, shared I²C, native USB, and 1-bit SDMMC with a 40 MHz maximum clock target.
Base-board reference
The Cerberus pin definitions list the built-in signal mappings. The firmware build guide covers the application memory layout and programming workflow. SDMMC uses a 40 MHz maximum setting; the card and firmware negotiate the actual clock.
The C5 memory specification uses the smallest standard WROOM option, N4: 4 MB flash and no PSRAM. Sentinel's current 2 MB firmware layout is a separate software allocation.
Expansion add-on status
| Expansion add-on | Status | Completed checks | Testing scope |
|---|---|---|---|
| Six-C5 bank | In testing | Six 4 MB WROOM modules passed programming verification | Assembled multi-radio operation and integration |
| RF/NFC board | Early testing | No published pin map | Design and wiring development |
Both are optional add-ons to the base board. The six-C5 signal assignments are listed on the pinouts page.
Documentation changelog
| Date | Change |
|---|---|
| 2026-10-27 | Initial Cerberus Dev Board hardware and programming reference |
| 2026-10-27 | Set C5 memory baseline to WROOM N4: 4 MB flash, no PSRAM |
| 2026-10-27 | Focused the reference on the base board and set SDMMC target to 40 MHz |
| 2026-10-27 | Confirmed BQ25895 on shared I²C0, GPIO8/9 at 0x6A; removed the RF/NFC map and download during early testing |
| 2026-10-27 | Added labeled expansion breakout contact order, processor domains, photo, and CSV |
| 2026-10-27 | Listed each expansion GPIO individually; removed power and ground contacts from the table and CSV |
| 2026-10-27 | Added four tested batteries: PL 606090, PL 505573, PL 695084, and BATMAX BT-PS3, with a reference photo |
| 2026-10-27 | Added Cerberus store and Discord community links to the overview |
| 2026-11-04 | Linked the tested 4000 mAh and BATMAX BT-PS3 batteries; added the tested Liter energy 306090 3000 mAh pack, with seller-listed dimensions and connector |
| 2026-11-06 | Displayed the corrected Cerberus hardware pinout diagram directly on the overview page and GitHub README |
Use the documentation issue form for corrections and supporting evidence. Hardware results should identify the firmware, date, attached add-on, and test conditions.