Cheatsheet — Sensor Data & AI Prep (M05)

Course 1 · Module 5

Lesson · Lab · ← Table of Contents

---

Driver calls

sensor_sht40_startup();   sensor_sht40_read(&s);
sensor_bmi270_read(&imu); /* or sensor_bmi270_try_read */
sensor_dps368_read(&baro);
sensor_bmm350_read(&mag);
sensor_*_is_ready();

Sample	Fields
sht40_sample_t	temperature, humidity
bmi270_sample_t	acc_*, gyr_*, temperature, elapsed_ms
dps368_sample_t	pressure, temperature
bmm350_sample_t	mag_*, temperature

I²C shared bus: cm55_i2c_manager_i2c_lock / unlock
BMM350: I3C (not I2C manager)

---

Sampling task

vTaskDelayUntil(&last, pdMS_TO_TICKS(period_ms));

No sensor_*_set_rate_hz in current drivers — period = task period or Bitstream SENSOR_CFG intervals.

---

Lab-local conditioning

ema = alpha * x + (1 - alpha) * ema;          /* filter */
y = 2 * (x - min) / (max - min) - 1;        /* normalize-ish */
imu_window_push(&w, &sample);               /* AI window */

---

Fusion (orientation)

cm55_imu_fusion_bridge_push_raw_components(ax, ay, az, gx, gy, gz, elapsed_ms);
cm55_imu_fusion_bridge_get_latest_result(&f); /* qw..qz, pitch, roll, orientation */

---

Host / twin

Tool	Link
Bitstream Studio	Marketplace
Hackathon demos	TESAIoT_Hackathon
Examples	dev.tesaiot.dev

SENSOR_CFG ideas: enabled, sampling_interval_ms, publish_interval_ms, publish_mode, mask

---

Edge AI scope (this module)

Do in M05	Not a current SDK lab API
Stable samples + windows	Ethos / NNLite run_model
Fusion orientation	DEEPCRAFT training in-firmware
Events from thresholds	Full gesture classifier product

---

Lab API log

งาน	API / เทคนิคที่ใช้
Sensor A read
Sensor B read
Task period
Filter / normalize
Window + feature
Fusion / host / event

Lesson · Lab · ← Table of Contents