COMPONENTS SELECTION¶
Main Control System¶
| Module | Antenna Type | FLASH Size | PSRAM Size |
|---|---|---|---|
| ESP32S3-WROOM-1 | PCB Antenna / IPEX Antenna | 16MB | 8MB |
| ESP32S3-WROOM-2 | PCB Antenna | 32MB | 16MB |
Tip
The above two models are preliminarily determined to be pin-compatible, but further verification is required.
Sensing System¶
🌡️ SHT45 — Digital Temperature & Humidity Sensor¶
| Item | Details |
|---|---|
| Manufacturer | Sensirion |
| Type | Digital temperature and humidity sensor |
| Interface | I²C (up to 1 MHz) |
| Measurement Range | Temperature: −40°C to +125°C; Humidity: 0%RH to 100%RH |
| Accuracy | Temperature ±0.1°C (typical), Humidity ±1.0%RH (typical) |
| Resolution | Temperature 0.01°C, Humidity 0.01%RH |
| Response Time | Humidity ~8 s (τ63%) |
| Supply Voltage | 1.08V ~ 3.6V |
| Power Consumption | Typical < 0.4 µA (low-power mode) |
| Package Size | 1.5 × 1.5 × 0.5 mm |
| Features | Integrated heater, factory-calibrated, high accuracy, high stability, suitable for long-term environmental monitoring |
⚙️ ADXL362 — Ultra-Low Power 3-Axis Accelerometer¶
| Item | Details |
|---|---|
| Manufacturer | Analog Devices (ADI) |
| Type | MEMS 3-axis accelerometer |
| Interface | SPI |
| Measurement Range | ±2g, ±4g, ±8g selectable |
| Resolution | 12-bit (typical) |
| Noise Density | 175 µg/√Hz (typical) |
| Output Data Rate | 12.5 Hz ~ 400 Hz |
| Supply Voltage | 1.6V ~ 3.5V |
| Power Consumption | 1.8 µA (wake-up mode), 270 nA (standby mode) |
| Package Size | 3 × 3 × 1.06 mm (LGA) |
| Features | Ultra-low power, built-in FIFO, integrated wake-up/motion detection, ideal for battery-powered nodes for event triggering or sleep monitoring |
📈 ADXL355 — Low Noise, High Precision 3-Axis Accelerometer¶
| Item | Details |
|---|---|
| Manufacturer | Analog Devices (ADI) |
| Type | MEMS 3-axis accelerometer |
| Interface | SPI / I²C |
| Measurement Range | ±2g, ±4g, ±8g |
| Resolution | 20-bit (effective ~19-bit) |
| Noise Density | 25 µg/√Hz (typical) |
| Output Data Rate | 4 Hz ~ 4 kHz |
| Supply Voltage | 2.25V ~ 3.6V |
| Power Consumption | 200 µA (operation), 21 µA (standby) |
| Package Size | 3 × 3 × 1.25 mm (LGA) |
| Features | Ultra-low noise, high resolution, high stability, integrated temperature sensor and self-calibration, ideal for vibration and seismic monitoring applications |
Communication System¶
| Communication Type | Model | Remarks |
|---|---|---|
| Wi-Fi | Integrated in main MCU | - |
| Bluetooth | Integrated in main MCU | Low power |
| 2.4G RF | NRF24L01+ | SPI interface |
| Cellular Network | Quectel BG95 | LTE Cat.M1 / NB-IoT, UART interface |
Actuation System¶
| Device Type | Model | Remarks |
|---|---|---|
| LED | - | - |
| RGB LED | WS2812B | - |
| Buzzer | - | - |
| Display | - | - |
Power System¶
| Device Type | Model | Remarks |
|---|---|---|
| Charging IC | - | - |
| Power Switch | - | - |
| Battery | - | - |
Note
All the above selections are preliminary and subject to change based on actual requirements.
A potential issue is that there are too many I²C and SPI devices, which may require the use of a multiplexer.