The **FUD-164-R/Q** is a high-performance **PIR (Passive Infrared) Sensor**, typically manufactured by companies like Murata or similar electronic component specialists. It is designed for motion detection, security systems, and automated lighting. --- ### 1. Key Technical Specifications The "R/Q" designation usually refers to the specific configuration or sensitivity profile of the sensor. | Feature | Specification | | :--- | :--- | | **Element Type** | Dual Element (compensates for ambient temperature) | | **Configuration** | TO-5 Metal Can Package | | **Supply Voltage** | 2.0V to 15.0V DC | | **Spectral Response** | 5μm to 14μm (Human body IR range) | | **Field of View** | 134° (Horizontal) / 120° (Vertical) | | **Operating Temp** | -40°C to +70°C | --- ### 2. Electronic Architecture The sensor consists of three primary internal components: 1. **Pyroelectric Material:** Two ceramic elements that generate an electrical charge when exposed to Infrared radiation (heat). 2. **Optical Filter:** A silicon window that acts as a band-pass filter, blocking visible light and allowing only IR wavelengths (8–14 microns) emitted by human skin. 3. **FET (Field Effect Transistor):** An internal FET acts as an impedance converter, transforming the high-impedance signal from the ceramic elements into a usable low-impedance voltage output. ### 3. Pin Configuration The device typically follows a standard 3-pin layout for PIR sensors: | Pin Number | Name | Description | | :--- | :--- | :--- | | **1** | VDD | Power supply (Drain) | | **2** | OUT | Signal output (Source) | | **3** | GND | Common ground (Case) | --- ### 4. Application Circuitry To use the FUD-164-R/Q in a project, it requires external circuitry to process the analog signal. Below is a conceptual example of the signal chain: ```mermaid graph LR A[PIR Element] --> B[FET Buffer] B --> C[Amplifier Stage] C --> D[Window Comparator] D --> E[MCU/Digital Output] ``` **Implementation Code (Pseudo-code for Microcontroller):** ```cpp const int pirPin = 2; // Connected to the output of the amplifier circuit void setup() { pinMode(pirPin, INPUT); Serial.begin(9600); } void loop() { int motion = digitalRead(pirPin); if (motion == HIGH) { Serial.println("Motion Detected!"); } } ```