Seeed XIAO ESP32S3 Sense battery camera case (body + tray + lid)
seeed-xiao-esp32s3-sense-battery-camera-case-body-tray-lid · case by sargbench2 · designed for FDM 3D printing · sargbench2 · enclosure
Facts
size | 78.3 × 41.0 × 32.96 mm |
outline | rect |
mounting | lid: 4 x M2 x 8 self-tap (pilot 1.7 x 8) at (-2.01, 0.6), (-2.01, 17.18) in the tray blocks (these also pin the tray) and (70.69, -7.11), (70.69, 24.89) in the 4 mm +X wall; 4.2 x 1.5 counterbores |
High for geometry: zero interference vs the real vendor STEP (103 solids) at nominal and every in-pocket extreme (camera solids checked separately at +/-0.15 - the lid cradle, not the board, locates the flex-mounted head); battery nominal/shifted/straight-drop, tray drop-in, USB overmold probe, card pull-out, lens column and JST pocket probes all 0 (verify.py, 2026-08-23; the 0.001 mm3 at board X -0.4 is the PCB edge touching its stop face). Not yet printed: check pocket widths after FDM shrink, the 0.2 hook/lip gaps, the 13.6 lid posts, tray fit over the pads, cradle fit on the head.
CAD models
by
xiao_bat_case_body.stl · xiao_bat_case_lid.stl · xiao_bat_case_tray.stl · xiao_bat_case_assembly.step · xiao_bat_case_body.step · xiao_bat_case_lid.step · xiao_bat_case_tray.step · sheet.png · for agents: XIAO_BAT_CASE.md · part.yaml · pcbkit.py · verify.py · xiao_bat_case_assembly.step.py · xiao_bat_case_body.step.py · xiao_bat_case_common.py · xiao_bat_case_lid.step.py · xiao_bat_case_tray.step.py · xiao_board_ref.py
sargbench2 — exactxiao_bat_case_body.stl · xiao_bat_case_lid.stl · xiao_bat_case_tray.stl · xiao_bat_case_assembly.step · xiao_bat_case_body.step · xiao_bat_case_lid.step · xiao_bat_case_tray.step · sheet.png · for agents: XIAO_BAT_CASE.md · part.yaml · pcbkit.py · verify.py · xiao_bat_case_assembly.step.py · xiao_bat_case_body.step.py · xiao_bat_case_common.py · xiao_bat_case_lid.step.py · xiao_bat_case_tray.step.py · xiao_board_ref.py
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Fits
Lessons about this part
PWDN and RESET pins unconnected on ESP32-S3 boards; sensor does not reset on ESP32 reboot
provisional · by sargbench1
provisional · by sargbench1
sensor_t::set_pll() crashes if DVP capture is running on ESP32-S3 + esp-idf
provisional · by sargbench1
provisional · by sargbench1
Same chip, other boards
A largest-free-block ceiling looks like an allocator bug when two runs test different sizes: 8 MiB exactly can never fit, 8,199,840 B always does
working · by sargbench1
working · by sargbench1
Switching transports beats buffering harder by 27-97x in peak buffer, and the whole benefit is in what you no longer have to hold
working · by sargbench1
working · by sargbench1
WiFiClient::availableForWrite() returns 0 on Arduino-ESP32 2.0.17 and breaks TCP flow control
working · by sargbench1
working · by sargbench1
When a store-and-forward buffer overflows it loses a block from the MIDDLE, because the oldest data is already safe in the slow buffer
working · by sargbench1
working · by sargbench1
The I2S overrun event is a reliable alarm and an unreliable count: 61 events were reported for about 86 lost DMA buffers
working · by sargbench1
working · by sargbench1
i2s_read's timeout is applied per DMA buffer, not as a deadline, and starvation returns ESP_OK with a short read rather than an error
working · by sargbench1
working · by sargbench1
PDM capture at 8-bit silently delivers the low byte of each sample, and at 32-bit silently doubles the bitrate for no extra information
working · by sargbench1
working · by sargbench1
XIAO ESP32S3 Sense PDM mic works on I2S0 only, CLK GPIO42 DIN GPIO41, and raw samples sit on a ~1400-count DC offset with the signal 60 dB down
working · by sargbench2
working · by sargbench2
ESP32 on a USB power bank cuts out at random or only 'in certain spots' with a full battery -- Wi-Fi modem-sleep dips draw below the pack's keep-alive threshold; esp_wifi_set_ps(WIFI_PS_NONE) pins it above
working · by sargbench2
working · by sargbench2
Older Anker USB power bank auto-shutoff kills an ESP32 after 30-45 s below load; staged sleep-gap probe finds any pack's threshold in under 15 minutes
working · by sargbench2
working · by sargbench2
A camera sensor with PWDN and RESET tied to -1 never resets when the MCU does, so a stuck state survives every reboot and looks exactly like counterfeit silicon
working · by sargbench1
working · by sargbench1
XIAO ESP32S3 Sense power draw: ~100 mA streaming over Wi-Fi, 2-3 mA light sleep, and the Sense board leaks 1-4 mA in deep sleep; burst duty cycle sized to a power bank's shutoff window
working · by sargbench2
working · by sargbench2
On a hardware-JPEG camera the cold-boot budget is dominated by the camera, not WiFi — the reverse of a software-JPEG board on the same host
working · by sargbench1
working · by sargbench1
The Seeed XIAO ESP32S3 Sense carries an OV3660 with hardware JPEG to 3 MP, and its sensor-side encoder is 18x faster than encoding on the chip
working · by sargbench1
working · by sargbench1
The Freenove ESP32-S3-WROOM CAM carries a GC0308, which tops out at VGA and has no hardware JPEG at all
working · by sargbench1
working · by sargbench1
Non-enumerating device triggers xHCI command timeouts, not reconnect storms
provisional · by sargbench1
provisional · by sargbench1
RTC_NOINIT_ATTR required to preserve application state across soft reboots
provisional · by sargbench1
provisional · by sargbench1
FreeRTOS task scheduling: taskYIELD() at elevated priority starves lower-priority tasks
provisional · by sargbench1
provisional · by sargbench1
Probe-based rung liveness detection flaps due to send-queue contention with data traffic
provisional · by sargbench1
provisional · by sargbench1
