The **M5TS-101-R** is a high-precision, digital thermal sensor module developed by Omron. It is designed specifically for non-contact temperature measurement, leveraging thermopile technology to detect infrared radiation from objects. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of the M5TS-101-R: | Feature | Specification | | :--- | :--- | | **Technology** | Thermopile (Non-contact IR) | | **Object Temp. Range** | -40°C to +200°C | | **Ambient Temp. Range** | -20°C to +80°C | | **Supply Voltage (Vcc)** | 3.3V to 5.0V DC | | **Interface** | I2C (Fast Mode Support) | | **Field of View (FoV)** | 10 degrees (approx.) | | **Resolution** | 0.01°C | --- ### 2. Electronic Components & Internal Architecture The module is not just a raw sensor; it is a sophisticated system-on-module (SoM) that includes several critical stages: 1. **Thermopile Array:** The core sensing element that converts infrared energy into a tiny millivolt (mV) signal. 2. **ASIC (Application Specific Integrated Circuit):** * **PGA (Programmable Gain Amplifier):** Amplifies the weak thermopile signal. * **ADC (Analog-to-Digital Converter):** Converts the analog signal into a high-resolution digital value. * **DSP (Digital Signal Processor):** Applies factory calibration coefficients and compensates for ambient temperature variations. 3. **EEPROM:** Stores unit-specific calibration data and optical correction factors. 4. **Reference Thermistor:** Measures the internal temperature of the sensor body to ensure accurate compensation (cold-junction compensation). --- ### 3. Implementation (Wiring & Code) The M5TS-101-R uses a standard 4-pin interface (VCC, GND, SDA, SCL). Below is a conceptual representation of the electronic connection and basic communication flow. #### Connection Logic ```text [ Microcontroller ] [ M5TS-101-R ] 3.3V / 5V <------> VCC GND <------> GND I2C SDA (PU) <------> SDA I2C SCL (PU) <------> SCL ``` *(Note: Pull-up resistors are required on SDA/SCL lines if not built into the controller.)* #### Example Pseudo-code for I2C Reading ```python import smbus # Default I2C Address for M5TS series is typically 0x35 DEVICE_ADDR = 0x35 def read_temperature(): # Command to read object temperature register data = i2c.read_i2c_block_data(DEVICE_ADDR, 0x00, 2) # Combine bytes and convert based on datasheet scale raw_temp = (data[0] << 8) | data[1] actual_temp = raw_temp / 100.0 return actual_temp ``` --- ### 4. Distinct Advantages * **Small Footprint:** Its compact size allows for integration into handheld medical devices or industrial machinery. * **Narrow Field of View:** The ~10° FoV allows for "spot" measurements, meaning it measures a specific target rather than an average of the entire background. * **Factory Calibrated:** Users do not need to perform complex black-body calibration, as the digital output is already linearized.