SEN0289

    Gravity: Digital Shake Sensor SKU: SEN0289 Introduction Do you want to switch lights by just shaking your hand? However, you may don't want to use a complicated and costly triple axis accelerometer. This digital shake sensor is sure to meet your needs. The digital shake sensor is to detect hand shaking which only sensitive to unidirectional hand movements. The spring-type vibration switch is used to output a low-level pulse when the user shakes once in the specified direction and the on-board indicator flashes at the same time. Thanks to the unidirectional sensitivity of the vibration switch and the corresponding filter circuit, it has strong anti-shock interference capability to prevent false triggering. Simple and easy, switch controls are all in just a single shake.     Features    Unidirection sensitive, strong anti-shock interference, preventing false triggering Compatible with 3.3V/5V controller Compact design, easy to install Applications   Shaking Light Stick Shake Switch Specifications     Input Voltage (VCC): 3.3V~5.0V Switch Life Span: Over 200,000 times Interface: Gravity 3P Digital Dimension: 30.0mm*22.0mm Board Overview Digital Shake Sensor     Label Name  Description  +  VCC  Power positive（3.3~5.0V）  ‐  GND  Power ground  D  Digital  Digital output (high‐level when stationary, low‐level pulse when  shaken)  PWR  Power  Power indicator (red), turned on when power up  ON  ON  Shake triggered indicator (blue)  How to Shake the Sensor The vibration switch used by the sensor is unidirectional sensitivity. As shown in the above figure, the user can hold the module just like the logo on the module, and shake it in the direction of the arrow indicated on-board (from +Y to Y-). This will generate an effective low-level interrupt pulse on the “D” pin and a bright flash on the indicator ON. Shakes or vibrations in other directions like the X or Z do not produce an effective interrupt pulse.     Arduino Tutorial Requirements     Hardware DFRduino UNO R3 (or similar) x 1 DFRobot Gravity: Digital Shake Sensor x 1 Gravity 3P digital wire (or Dupont wires) x 1   Software Arduino IDE (V1.0.x or V1.8.x), Click to Download Arduino IDE from Arduino® Connection Diagram Example Codes #define LED_PIN 13 #define DIGITAL_INPUT_PIN Pin 3 which is Interrupts 1. 3 unsigned char stateFlag = 0; unsigned long timepoint = 0; void setup()   //Connect the sensor to digital   { pinMode(LED_PIN, OUTPUT); // Set to input mode with internal pull-up. // Otherwise, it will fail to generate intterupts under 3.3V power supply. pinMode(DIGITAL_INPUT_PIN, INPUT_PULLUP); attachInterrupt(1, toggleLED, FALLING); when the falling edge is detected // Trigger LED toggle function timepoint = millis(); } void loop() { // toggle onboard LED if (stateFlag != 0){ digitalWrite(LED_PIN, HIGH); } else { digitalWrite(LED_PIN, LOW); } } //Interrupt serivce routinue void toggleLED() { // The hardware has done some filter. // To further improve stability, here add a 50ms for debouncing. // This will not block the main function. if (millis() - timepoint > 50U){ timepoint = millis(); stateFlag = (stateFlag + 1) % 2; } }     Results  In the direction indicated by the arrow on-board, every time the module is shaken, the ON indicator on the sensor will flash once. The indicator L on the Arduino UNO will be toggled once. Micro:bit Tutorial Requirements      Hardware Micro:bit x 1 Micro:mate x 1 DFRobot Gravity: Digital Shake Sensor x 1 Gravity 3P digital wire (or Dupont wires) x 1   Software Microsoft Makecode Connection Diagram     Example Codes Results  Shake the module in the direction indicated on-board several times with force. The dot matrix LED displays the heartbeat pattern. https://www.dfrobot.com/wiki/index.php/Gravity:_Digital_Shake_Sensor_SKU:_SEN0289#More_Documents 11-12-18