AMS Flight Logger — AMS-71

IoT flight logger prototype for the AMS automated CAMO/CAO service.

Hardware

• Board: Lilygo TTGO T-SIM7000G (ESP32, 4MB Flash, 8MB PSRAM)
• Cellular: SIM7000G — LTE Cat-M1 / NB-IoT / 2G (1NCE SIM)
• GPS: SIM7000G integrated GNSS (UART1)
• IMU: MPU-6050 via I2C (SDA=21, SCL=22)
• Storage: microSD (SPI, CS=13) — built-in on T-SIM7000G
• Power: 18650 LiPo via on-board charger

Build

pip install platformio
pio run -e t-sim7000g          # production build
pio run -e t-sim7000g-debug    # simulated GPS/IMU (no hardware needed)
pio run -e t-sim7000g --target upload
pio device monitor --baud 115200

Data output

Per-flight JSON (/flights/<id>.json):

{
  "flight_id": "1745230800",
  "engine_on_utc": 1745230800,
  "engine_off_utc": 1745234400,
  "takeoff_utc": 1745230980,
  "landing_utc": 1745234100,
  "engine_time_s": 3600,
  "flight_time_s": 3120,
  "vibration_anomaly": false,
  "track_file": "/tracks/1745230800.csv"
}

GPS track CSV (/tracks/<id>.csv):

utc_epoch,lat,lng,alt_m,speed_kn
1745230980,50.061389,19.938333,215.0,95.3
...

State machine

GROUND → [engine RMS > threshold] → ENGINE_ON
ENGINE_ON → [GPS speed > 30kn for 5s] → AIRBORNE
AIRBORNE → [GPS speed < 20kn] → LANDING
LANDING → [engine RMS < threshold] → GROUND