The **B-03-R** typically refers to a specific series of **Passive Infrared (PIR) Motion Sensor Modules** or **Relay Control Boards** used in automation and security electronics. Below is a detailed breakdown of the electronic components and technical specifications associated with this part. --- ### 1. Core Electronic Components The B-03-R module is an integrated circuit assembly designed to detect infrared radiation and trigger an output. | Component | Function | | :--- | :--- | | **PIR Sensor (Pyroelectric)** | Detects changes in infrared radiation (heat) from moving objects. | | **BISS0001 IC** | A high-performance sensor signal processing integrated circuit. | | **Voltage Regulator** | Usually a 3.3V LDO to stabilize the power for the sensing IC. | | **Potentiometers** | Two adjustable resistors: one for **Sensitivity** and one for **Time Delay**. | | **Output Relay/Transistor** | Switches the external load (light, buzzer, or motor) on or off. | | **Fresnel Lens** | The plastic dome that focuses infrared light onto the sensor element. | --- ### 2. Technical Specifications The electrical characteristics are critical for integrating the B-03-R into a larger system (like an Arduino or home lighting circuit). * **Operating Voltage:** DC 5V – 20V (Commonly 12V for the "R" relay version). * **Static Current:** < 50µA. * **Output Level:** High 3.3V / Low 0V (or Relay Contact switch). * **Delay Time:** Adjustable (0.3 seconds to 18 minutes). * **Detection Range:** 3 to 7 meters (Adjustable). * **Detection Angle:** < 120° cone angle. --- ### 3. Connection Pinout Most B-03-R modules utilize a 3-pin or 4-pin interface for wiring: 1. **VCC:** Power supply input (Positive). 2. **OUT:** Digital signal output (High/Low) or Relay Common. 3. **GND:** Ground (Negative). 4. **RT/RC (Optional):** External thermistor or photoresistor connection to disable the sensor during daylight. --- ### 4. Operating Modes The module usually supports two trigger modes, selectable via a jumper: * **Non-repeatable Trigger (L):** The output goes high and stays high for the duration, then goes low regardless of motion during the delay. * **Repeatable Trigger (H):** If motion is detected during the delay period, the timer resets, keeping the output high until motion stops.