The **HAS-01-R** is a specific electronic component, typically identified as a **High-Sensitivity Vibration Sensor** or a **Shock Sensor Switch**. It is widely used in security systems, toys, and low-power wake-up circuits to detect mechanical movement. --- ### 1. Technical Specifications The HAS-01-R is a passive component that acts as a momentary switch triggered by vibration. | Parameter | Specification (Typical) | | :--- | :--- | | **Type** | Non-directional vibration sensor | | **Max Voltage** | 12V DC | | **Max Current** | < 20mA | | **Contact Resistance** | < 10 Ohms (when triggered) | | **Operating Temp** | -40°C to +80°C | | **Life Expectancy** | Up to 100,000 cycles | --- ### 2. Internal Construction and Mechanism The device generally consists of a small metallic housing containing a conductive spring and a center pin. * **The Spring:** A highly flexible, conductive spring surrounds a central metal post. * **The Trigger:** When the unit is still, the spring and the post do not touch (Open Circuit). * **The Action:** When mechanical shock or vibration occurs, the spring vibrates and momentarily strikes the center post, completing the circuit (Closed Circuit). * **Response:** Because the contact is momentary and "bouncy," it is usually paired with a debouncing circuit or a microcontroller. --- ### 3. Connection and Circuit Integration To use the HAS-01-R with a microcontroller (like an Arduino or ESP32), you should treat it like a momentary push button. #### Typical Wiring Diagram 1. **Pin 1:** Connect to Digital Input Pin (with Pull-up resistor). 2. **Pin 2:** Connect to Ground (GND). ```cpp // Basic Arduino Example int sensorPin = 2; // HAS-01-R connected to D2 int ledPin = 13; void setup() { pinMode(sensorPin, INPUT_PULLUP); pinMode(ledPin, OUTPUT); } void loop() { int measurement = digitalRead(sensorPin); if (measurement == LOW) { digitalWrite(ledPin, HIGH); // Vibration detected } else { digitalWrite(ledPin, LOW); } } ``` --- ### 4. Key Applications * **Anti-theft Alarms:** Detecting when a window is broken or a vehicle is moved. * **Power Management:** "Wake-up" sensors for battery-powered devices (the device stays in sleep mode until moved). * **Smart Toys:** Activating lights or sounds when a toy is shaken. * **Industrial Monitoring:** Detecting abnormal machine vibrations. ---