The **HTS-04-R** is a specific electronic component typically categorized as a **Surface Mount (SMD) Humidity and Temperature Sensor**. It is widely used in climate control systems, home automation, and industrial monitoring. Below is a detailed breakdown of its technical specifications and features. --- ### 1. Key Technical Specifications The HTS-04-R is designed for high precision and low power consumption. | Parameter | Specification | | :--- | :--- | | **Input Voltage (Vcc)** | 2.3V to 3.6V DC | | **Output Type** | Digital (I2C Interface) | | **Temperature Range** | -40°C to +125°C | | **Humidity Range** | 0% to 100% RH | | **Temperature Accuracy** | ±0.3°C (typical) | | **Humidity Accuracy** | ±3% RH | | **Package Type** | DFN (Dual Flat No-leads) | --- ### 2. Functional Components The sensor integrates several electronic sub-systems into a single tiny package: 1. **Capacitive Humidity Sensor:** Measures the change in capacitance of a polymer layer as it absorbs moisture from the air. 2. **Band-gap Temperature Sensor:** A precision semiconductor sensor that measures thermal changes. 3. **ADC (Analog-to-Digital Converter):** Converts the analog signals from the sensors into high-resolution digital data (usually 12-bit to 14-bit). 4. **Digital Interface (I2C):** Uses a Serial Data (SDA) and Serial Clock (SCL) line to communicate with a microcontroller (like Arduino, ESP32, or STM32). --- ### 3. Pin Configuration The device usually features a standard 4-pin or 6-pin layout. | Pin Name | Function | Description | | :--- | :--- | :--- | | **VDD** | Power Supply | 3.3V typical supply voltage | | **GND** | Ground | Common ground connection | | **SCL** | Serial Clock | Clock line for I2C communication | | **SDA** | Serial Data | Data line for I2C communication | --- ### 4. Application Circuit Example To interface the HTS-04-R with a microcontroller, pull-up resistors are required for the I2C lines. ```cpp // Typical I2C Initialization for HTS-04-R (Pseudo-code) #include #define HTS_ADDR 0x40 // Standard I2C address for these sensors void setup() { Wire.begin(); Serial.begin(9600); } void loop() { // Trigger measurement and read data // 1. Send Command // 2. Wait for conversion // 3. Read 4-6 bytes (Temp + Humidity + Checksum) } ``` --- ### 5. Notable Features * **Fully Calibrated:** The sensor comes factory-calibrated; the calibration coefficients are stored in the internal OTP memory. * **Low Power Consumption:** It features a "Sleep Mode" that draws less than 1µA, making it ideal for battery-operated IoT devices. * **Fast Response Time:** Capable of providing updated readings in under 8 seconds for humidity changes.