Unit TMOS PIR
Description
TMOS PIR Unit is a high-sensitivity infrared sensor unit for presence and motion detection. It uses the STHS34PF80 chip solution. It communicates with M5 devices through I2C (default address: 0x5A). Its working principle is based on the black-body radiation principle described by Planck's law, which allows it to monitor ambient temperature and detect human presence and motion. The sensor can distinguish between stationary and moving objects and has an 80-degree field of view, providing a wide detection range. Additionally, it supports adjustable sampling frequency and gain modes to meet different application needs. It is suitable for applications such as alarm systems, smart lighting, and occupancy detection.
Note
1. Set the TMOS gain mode:
Default gain mode: High sensitivity, but it may cause sensor saturation. Saturation can lead to delayed updates of the motion/presence detection flag;
Wide mode: Shorter detection distance, but avoids sensor saturation.
2. Sensitivity to temperature differences: The output signal of the TMOS sensor is very sensitive to the temperature difference between the sensor's own ambient temperature and the ambient temperature of the measurement room. This temperature difference can affect the sensor's measurement.
3. Power-down mode settings: When the device is in power-down mode, the register resets to its default value each time the device is started or restarted. Calibration temperature needs to be reset. Therefore, if the application requires covering a wide operating temperature range and the temperature difference between the room and the sensor's thermal coupling environment, the user needs to set the wide mode when the device starts.
Default gain mode: High sensitivity, but it may cause sensor saturation. Saturation can lead to delayed updates of the motion/presence detection flag;
Wide mode: Shorter detection distance, but avoids sensor saturation.
2. Sensitivity to temperature differences: The output signal of the TMOS sensor is very sensitive to the temperature difference between the sensor's own ambient temperature and the ambient temperature of the measurement room. This temperature difference can affect the sensor's measurement.
3. Power-down mode settings: When the device is in power-down mode, the register resets to its default value each time the device is started or restarted. Calibration temperature needs to be reset. Therefore, if the application requires covering a wide operating temperature range and the temperature difference between the room and the sensor's thermal coupling environment, the user needs to set the wide mode when the device starts.
Product Features
- High sensitivity infrared detection
- Wide field of view
- Presence and motion detection
- I2C communication (0x5A)
- Programmable output data rate
Includes
- 1x TMOS PIR Unit
- 1x HY2.0-4P Grove cable (20cm)
Applications
- Presence and proximity sensing
- Alarm/security systems
- Furniture automation
- Smart lighting
- Internet of Things (IoT)
- Smart storage cabinets
Specifications
| Specification | Parameter |
|---|---|
| Sensor | STHS34PF80 |
| I2C Communication Address | 0x5A |
| Measurement Distance | Over 2 meters |
| Minimum Detection Size | 70 x 25 cm² |
| Field of View (FOV) | 80° |
| Programmable Output Data Rate | 0.25 Hz to 30 Hz |
| Infrared Wavelength | 5 to 20µm |
| Infrared Sensitivity | 2000 LSB/°C |
| Sensor Accuracy | ±0.3°C |
| Gain Modes | Default gain mode, wide mode |
| Product Dimensions | 32*24*8mm |
| Package Dimensions | 136*92*13mm |
| Product Weight | 4.4g |
| Package Weight | 10g |
Related Links
Schematic
PinMap
| PORT A | SCL | SDA | VCC | GND |
|---|---|---|---|---|
| Core(Basic) | G22 | G21 | 5V | GND |
| Core2 | G33 | G32 | 5V | GND |
| CoreS3 | G1 | G2 | 5V | GND |
| ATOM Lite/ATOM Matrix | G32 | G26 | 5V | GND |
| ATOMS3/ATOMS3 Lite | G1 | G2 | 5V | GND |
| StickC/StickC PLUS/StickC PLUS2 | G33 | G32 | 5V | GND |
Dimensions
Example
Arduino
UIFlow
How to use Unit tmos and related API instructions in the UIFlow2.0
Video
Product Comparison
| Product | Chip Solution | Measurement Range | FOV | Communication | Function |
|---|---|---|---|---|---|
| TMOS PIR Unit (U185) | STHS34PF80 | 2M | 80° | I2C (0x5A) | Detection of thermal sources and motion detection |
| PIR Unit (U004) | AS312 | 5M | 100° | IO | Motion detection of thermal sources |
| Thermal2 Unit (U149) | MLX90640 | Related to distance and material reflectivity | 110° (32x24 pixels) | I2C (0x52) | Thermal imaging |
| NCIR2 Unit (U150) | MLX90614 | Related to distance and material reflectivity | 90° | I2C (0x5A) | Single-point thermal temperature measurement |