The **I002** identifier most commonly refers to the **I002 Heart Rate & Blood Oxygen Sensor Module** (often associated with the MAX30102 sensor series) used in wearable technology and DIY health monitoring projects. --- ## 1. Core Component Breakdown The I002 module is an integrated pulse oximetry and heart-rate monitor biosensor. It includes internal LEDs, photodetectors, optical elements, and low-noise electronics with ambient light rejection. ### Key Electronic Elements: * **Dual LEDs:** Typically one Red LED (660nm) and one Infrared LED (880nm). * **Photodetector:** A highly sensitive silicon photodiode to measure the light reflected back through the skin. * **ADC (Analog-to-Digital Converter):** A high-resolution 18-bit delta-sigma ADC to convert the analog light signals into digital data. * **Logic Interface:** Usually utilizes an **I2C** communication protocol for interfacing with microcontrollers. --- ## 2. Technical Specifications Below is a summary of the electronic operating parameters for the I002 module: | Parameter | Value/Range | | :--- | :--- | | **Supply Voltage (VCC)** | 1.8V to 3.3V (Logic) / 5V (LED Supply) | | **Communication** | I2C (Inter-Integrated Circuit) | | **I2C Address** | 0x57 (7-bit) | | **Operating Current** | < 1mA during measurement | | **Shutdown Current** | 0.7µA (Typical) | | **Operating Temp** | -40°C to +85°C | --- ## 3. Pin Configuration The module typically features a 5-pin or 7-pin layout depending on the specific breakout board manufacturer: 1. **VIN:** Power supply input. 2. **SCL:** I2C Serial Clock. 3. **SDA:** I2C Serial Data. 4. **INT:** Interrupt pin (active low). 5. **GND:** Ground. 6. **RD:** Red LED Supply (on some versions). 7. **IRD:** IR LED Supply (on some versions). --- ## 4. Working Principle The I002 module operates on the principle of **Photoplethysmogram (PPG)**: 1. **Light Emission:** The LEDs shine light into the tissue (finger or earlobe). 2. **Absorption:** Oxygenated hemoglobin absorbs more IR light, while deoxygenated hemoglobin absorbs more Red light. 3. **Detection:** The photodetector measures the amount of light not absorbed. 4. **Processing:** The microcontroller calculates the heart rate (pulse) and SpO2 levels (blood oxygen) based on the ratio of light absorption. --- ### Basic Implementation (Arduino Example) ```cpp #include #include "MAX30105.h" // Common library for I002/MAX30102 MAX30105 particleSensor; void setup() { Serial.begin(115200); if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) { Serial.println("I002 sensor not found!"); while (1); } particleSensor.setup(); // Configure sensor with default settings } void loop() { Serial.print(" IR: "); Serial.println(particleSensor.getIR()); // Read IR value } ```