The **8-3SHT1-R** is a high-precision, digital relative humidity and temperature sensor. It is part of the SHT3x series by Sensirion, widely regarded as the industry standard for environmental sensing due to its reliability and small form factor. --- ### 1. Key Technical Specifications The following table highlights the core electronic performance metrics of the sensor: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Supply Voltage (Vdd)** | 2.15V to 5.5V | Compatible with 3.3V and 5V systems | | **Interface** | I2C (Inter-Integrated Circuit) | Digital communication protocol | | **RH Accuracy** | ±1.5% RH | Typical accuracy at 25°C | | **Temp Accuracy** | ±0.1°C | High precision across standard ranges | | **Power Consumption** | 2.0µA (Avg) | Low power, ideal for battery devices | | **Package Type** | DFN-8 | Surface-mount (2.5 x 2.5 x 0.9 mm) | --- ### 2. Functional Components The "8-3SHT1-R" consists of several internal electronic stages integrated into a single CMOS chip: 1. **Sensing Element:** A capacitive humidity sensor and a band-gap temperature sensor. 2. **ADC (Analog-to-Digital Converter):** Converts raw analog signals from the sensors into high-resolution digital data. 3. **Signal Processing:** Includes a calibration memory and digital linearization logic to ensure the output is accurate without external calculation. 4. **I2C Interface:** Handles communication with a microcontroller (MCU). It supports clock stretching and multiple I2C addresses (via the ADDR pin). --- ### 3. Pin Configuration The sensor typically features 8 pins (DFN package), though not all are always used for basic operation: * **VDD / VSS:** Power supply and ground. * **SCL / SDA:** Serial Clock and Serial Data lines for I2C communication. * **ADDR:** Address pin to allow two sensors on the same I2C bus. * **RESET:** Hardware reset pin (active low). * **ALERT:** Programmable interrupt pin to signal when thresholds are exceeded. --- ### 4. Implementation Example To interface with the 8-3SHT1-R using a microcontroller (like Arduino or ESP32), you would typically use the following logic: ```cpp #include void setup() { Wire.begin(); // Initialize I2C bus Serial.begin(9600); } void loop() { // Command to start measurement: 0x2C06 Wire.beginTransmission(0x44); // Default I2C Address Wire.write(0x2C); Wire.write(0x06); Wire.endTransmission(); delay(20); // Wait for conversion // Read 6 bytes: [Temp MSB, Temp LSB, CRC, RH MSB, RH LSB, CRC] Wire.requestFrom(0x44, 6); // ... Process data using Sensirion formulas ... } ``` ---