LIS3DH with Arduino Uno

First, log in to your Simuli account and navigate to the Simuli Virtual Lab. Here we will create a new emulated instance of the Arduino Uno. Click on the Launch button under the Arduino to get started.

This will open the configuration menu. First, provide a name for the project. Then, we will add the LIS3DH MEMS Motion Sensor by selecting it from the list of available components. Finally, review that the name for the project and the selected sensors are correct and click on the Launch button.

Once we have clicked on the Launch button, a new instance of the Arduino Uno will be created. It can take a few minutes, so be patient.

If you have not set up your Arduino IDE, follow the guide linked below.

pagePrerequisites for Arduino Development

Once you have the Arduino IDE ready to go, copy the code given below and paste it in the IDE.

#include <Wire.h>
#include <Adafruit_LIS3DH.h>
#include <Adafruit_Sensor.h>

Adafruit_LIS3DH lis = Adafruit_LIS3DH();

void setup(void) {
  Serial.begin(115200);
  while (!Serial) delay(10);    

  Serial.println("LIS3DH test!");

  if (! lis.begin(0x19)) {  
    Serial.println("Couldnt start");
    while (1) yield();
  }
  Serial.println("LIS3DH found!");

  lis.setRange(LIS3DH_RANGE_16_G);   // 2, 4, 8 or 16 G!
}

void loop() {

  //Accelerometer Readings
  lis.read();      // get X Y and Z data at once
  sensors_event_t event;
  lis.getEvent(&event);

  /* Display the results (acceleration is measured in m/s^2) */
  Serial.print("| X: "); Serial.print(event.acceleration.x);
  Serial.print("  Y: "); Serial.print(event.acceleration.y);
  Serial.print("  Z: "); Serial.print(event.acceleration.z);
  Serial.println(" m/s^2 ");

  //ADC Readings
  int16_t adc;
  uint16_t volt;

  adc = lis.readADC(1);
  volt = map(adc, -32512, 32512, 1800, 900);
  Serial.print("ADC1:\t"); Serial.print(volt); Serial.print(" mV  "); 
  
  adc = lis.readADC(2);
  volt = map(adc, -32512, 32512, 1800, 900);
  Serial.print("ADC2:\t"); Serial.print(volt); Serial.print(" mV  ");  

  adc = lis.readADC(3);
  volt = map(adc, -32512, 32512, 1800, 900);
  Serial.print("ADC3:\t"); Serial.print(volt); Serial.print(" mV  "); 

  delay(200);
}

Before we can compile this code, we need to install the relevant library. For this, open your Arduino IDE and go to Tools and then to Manage Libraries.... This will open up the library manager, here we can search for Adafruit LIS3DH library. Now select the library and install it. Now search for Adafruit Unified Sensor library, select the library and install it. Now we are ready to compile our code.

Install version 1.1.3 of the Adafruit Unified Sensor library instead of version 1.1.4, since it may be unstable.

Now save the sketch in a folder and keep a note of that folder. We now need to get the compiled binaries for the sketch. Go to Sketch and find Export Compiled Binary. The program will take some time to compile. Once the compilation is complete, go back to IoTIFY Virtual Lab and open the instance we created.

A new tab will open and we can interact with our Arduino. First, we need to uploadour compiled binary. Click on the Arduino, this will open a file explorer, navigate to where you had stored the Arduino sketch. In the same folder, a file called sketch.ino.standard.hex will be present (where sketch is the name of the Arduino sketch). Select this file and click on open. Now the hex file will be uploaded. Finally, reset the Arduino so that it loads the new file. To reset, just click the red power button above the top left corner of the Arduino. Now you can see the reading of the LIS3DH sensor in the terminal. If you change the values on the sensor, it will also be reflected in the terminal.

Now that you know how to get the readings from the LIS3DH sensor, you could try to make a fall detector. The simplest approach would be to check if there's a sharp change in acceleration in the X-axis. You can store the current reading in a temporary variable and then check the difference between it and the next reading. Keep building and have fun! 🎉