Lab log
What actually passed on this bench. Detail lives in each phase; this page is the scoreboard.
Bench
| Item |
Value |
| Host |
Ubuntu 24.04 · CH340 1a86:7523 · port moves (/dev/ttyUSB0 / ttyUSB1) |
| Board |
ESP32-D0WD-V3 · MAC 8C:94:DF:6D:C9:5C |
| Stack |
ATGM336H · ST7789 240×240 (TFT + GNSS power on) |
| On chip now |
firmware/07-field-ui |
Checkpoints
| # |
Result |
Notes |
| 0 |
Pass |
CH340 /dev/ttyUSB0 · ESP32-D0WD-V3 rev v3.1 · MAC 8C:94:DF:6D:C9:5C · erase ~12 s |
| 1 |
Pass |
build 2.3 s · upload ~20 s · serial hello + MAC 8C:94:DF:6D:C9:5C · flash 4MB |
| 2 |
Pass |
TFT VCC/GND/BL → 3V3 star · hello OK after replug on ttyUSB1 |
| 3 |
Pass |
GNSS VCC/GND + antenna · hello OK (watch heat — 3V3 only) |
| 4 |
Pass |
UART GPIO16←TX · $GNGGA/$GNRMC/$BDGSV · ANTENNA OK · no fix indoors (expected) |
| 5 |
Pass |
structured fix=NONE sats=0/0 hdop=25.5 ~1 Hz indoors · 3D deferred to sky |
| 6 |
Pass |
SPI 18/23/5/21/22 · init(240,240,SPI_MODE3) · panel R→G→B |
| 7 |
Pass |
outdoor FIX 3D · SAT 8/10 · HDOP 2.3 · lat/lon locked · demo photo |
Quirks worth remembering
- Classic ESP32 here is CH340 →
/dev/ttyUSB*, not the S3 dual Type-C COM jack from seismo. After unplug/replug the number can move (ttyUSB0 → ttyUSB1); check ls /dev/ttyUSB* before monitor/upload.
- Cold start indoors can take minutes or never get a 3D fix — outdoor / clear sky is the real Phase 7 checkpoint.
- If NMEA looks like garbage, try baud 115200 instead of 9600.
- This ST7789 240×240 needed
tft.init(240, 240, SPI_MODE3) (MODE0 stayed blank); don’t pass CS into SPI.begin.
