Example Code for Arduino-Wakeup Function

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• H3LIS200DL Triple Axis Accelerometer (Breakout Version) x1
• Jumper wires

Software Preparation

• Arduino IDE
• Download and install the LIS Series Library and Sample Code. (About how to install the library?)

Wiring Diagram

Other Preparation Work

• Select wakeUp.ino from the library examples.
• Connect the interrupt pin (INT1) of the module to the interrupt pin of the Arduino (e.g., D6 for ESP32/ESP8266, pin 2 for UNO).

Sample Code

/**！
 * @file wakeUp.ino
 * @brief Use wake-up function
 * @n Phenomenon: To use this function, you need to turn the module into low-power mode first, and the measurement rate will be 
 * @n very slow at this time. When an interrupt event set up before occurs, the module will enter normal mode, in which the measurement rate 
 * @n will be accelerated to save power and provide sampling rate. 
 * @n When using SPI, chip select pin can be modified by changing the value of macro H3LIS200DL_CS.
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @licence     The MIT License (MIT)
 * @author [fengli]([email protected])
 * @version  V1.0
 * @date  2021-01-16
 * @get from https://www.dfrobot.com
 * @https://github.com/DFRobot/DFRobot_LIS
 */

#include <DFRobot_LIS.h>
//When using I2C communication, use the following program to construct an object by DFRobot_H3LIS200DL_I2C
/*!
 * @brief Constructor 
 * @param pWire I2c controller
 * @param addr  I2C address(0x18/0x19)
 */
//DFRobot_H3LIS200DL_I2C acce(&Wire,0x18);
DFRobot_H3LIS200DL_I2C acce;

//When using SPI communication, use the following program to construct an object by DFRobot_H3LIS200DL_SPI
#if defined(ESP32) || defined(ESP8266)
#define H3LIS200DL_CS  D3
#elif defined(__AVR__) || defined(ARDUINO_SAM_ZERO)
#define H3LIS200DL_CS 3
#elif (defined NRF5)
#define H3LIS200DL_CS 2  //The pin on the development board with the corresponding silkscreen printed as P2
#endif
/*!
 * @brief Constructor 
 * @param cs : Chip selection pinChip selection pin
 * @param spi :SPI controller
 */
//DFRobot_H3LIS200DL_SPI acce(/*cs = */H3LIS200DL_CS);

//Interrupt generation flag
volatile bool intFlag = false;

void interEvent(){
  intFlag = true;
}

void setup(void){

  Serial.begin(9600);
  //Chip initialization
  while(!acce.begin()){
     delay(1000);
     Serial.println("Initialization failed, please check the connection and I2C address settings");
  }
  //Get chip id
  Serial.print("chip id : ");
  Serial.println(acce.getID(),HEX);
  
  /**
    set range:Range(g)
              eH3lis200dl_100g,/< ±100g>/
              eH3lis200dl_200g,/< ±200g>/
  */
  acce.setRange(/*Range = */DFRobot_LIS::eH3lis200dl_100g);


  /**
   “sleep to wake-up”  need to put the chip in low power mode first
   Set data measurement rate：
   
      ePowerDown_0HZ = 0,
      eLowPower_halfHZ,
      eLowPower_1HZ,
      eLowPower_2HZ,
      eLowPower_5HZ,
      eLowPower_10HZ,
      eNormal_50HZ,
      eNormal_100HZ,
      eNormal_400HZ,
      eNormal_1000HZ,
  */
  acce.setAcquireRate(/*Rate = */DFRobot_LIS::eLowPower_halfHZ);
  
  /**
    Set the threshold of interrupt source 1 interrupt
    threshold:Threshold(g)
   */
  acce.setInt1Th(/*Threshold = */6);
  //Enable sleep wake function
  acce.enableSleep(true);
  Serial.println("sleep");
  /*!
    Enable interrupt
    Interrupt pin selection:
      eINT1 = 0,/<int1 >/
      eINT2,/<int2>/
    Interrupt event selection:
      eXLowerThanTh ,/<The acceleration in the x direction is less than the threshold>/
      eXHigherThanTh ,/<The acceleration in the x direction is greater than the threshold>/
      eYLowerThanTh,/<The acceleration in the y direction is less than the threshold>/
      eYHigherThanTh,/<The acceleration in the y direction is greater than the threshold>/
      eZLowerThanTh,/<The acceleration in the z direction is less than the threshold>/
      eZHigherThanTh,/<The acceleration in the z direction is greater than the threshold>/
   */
  acce.enableInterruptEvent(/*int pin*/DFRobot_LIS::eINT1,/*interrupt event = */DFRobot_LIS::eZHigherThanTh);
  
  #if defined(ESP32) || defined(ESP8266)||defined(ARDUINO_SAM_ZERO)
  attachInterrupt(digitalPinToInterrupt(D6)/*Query the interrupt number of the D6 pin*/,interEvent,CHANGE);
  #else
  /*    The Correspondence Table of AVR Series Arduino Interrupt Pins And Terminal Numbers
   * ---------------------------------------------------------------------------------------
   * |                                        |  DigitalPin  | 2  | 3  |                   |
   * |    Uno, Nano, Mini, other 328-based    |--------------------------------------------|
   * |                                        | Interrupt No | 0  | 1  |                   |
   * |-------------------------------------------------------------------------------------|
   * |                                        |    Pin       | 2  | 3  | 21 | 20 | 19 | 18 |
   * |               Mega2560                 |--------------------------------------------|
   * |                                        | Interrupt No | 0  | 1  | 2  | 3  | 4  | 5  |
   * |-------------------------------------------------------------------------------------|
   * |                                        |    Pin       | 3  | 2  | 0  | 1  | 7  |    |
   * |    Leonardo, other 32u4-based          |--------------------------------------------|
   * |                                        | Interrupt No | 0  | 1  | 2  | 3  | 4  |    |
   * |--------------------------------------------------------------------------------------
   */
  /*                      The Correspondence Table of micro:bit Interrupt Pins And Terminal Numbers
   * ---------------------------------------------------------------------------------------------------------------------------------------------
   * |             micro:bit                       | DigitalPin |P0-P20 can be used as an external interrupt                                     |
   * |  (When using as an external interrupt,      |---------------------------------------------------------------------------------------------|
   * |no need to set it to input mode with pinMode)|Interrupt No|Interrupt number is a pin digital value, such as P0 interrupt number 0, P1 is 1 |
   * |-------------------------------------------------------------------------------------------------------------------------------------------|
   */
  attachInterrupt(/*Interrupt No*/0,interEvent,CHANGE);//Enable the external interrupt 0, connect INT1/2 to the digital pin of the main control: 
     //UNO(2), Mega2560(2), Leonardo(3), microbit(P0).
  #endif
  delay(1000);
}

void loop(void){
  //Get the acceleration in the three directions of xyz
  //The mearsurement range is ±100g or ±200g, set by setRange() function.
  Serial.print("Acceleration x: ");
  Serial.print(acce.readAccX());
  Serial.print(" g \ty: ");
  Serial.print(acce.readAccY());
  Serial.print(" g \tz: ");
  Serial.print(acce.readAccZ());
  Serial.println(" g");
  delay(300);
  if(intFlag == 1){
    Serial.println("wake up");
    intFlag = 0;
  }
}

Result

When the acceleration in the Z direction exceeds 6g, the module wakes up from low-power mode, and "wake up" is printed on the serial monitor.

• Screenshot of the code selection: