Accelerometer 3-Axis LIS3DHTR(ST) Sensor Module (Grove Seeed)

Features:

• 3-Axis Motion Detection: Measures acceleration simultaneously on X, Y, and Z axes.
• Multiple Measurement Ranges: Supports selectable ranges of ±2g, ±4g, ±8g, and ±16g.
• Multiple Communication Interfaces: Compatible with I2C, SPI, and ADC GPIO interfaces.
• Temperature Compensation: Allows correction of measurement variations caused by environmental temperature changes.
• Low Power Consumption: Optimized for portable and battery-powered applications.
• Wide Voltage Compatibility: Operates from both 3V and 5V systems.
• Grove Ecosystem Compatible: Plug-and-play connection through the standard Grove interface.
• Interrupt Support: Dedicated interrupt output for motion-triggered events.

Principle of Work:

The LIS3DHTR is a MEMS (Micro-Electro-Mechanical Systems) accelerometer that measures acceleration by detecting displacement of microscopic internal structures caused by movement or gravity.

1. MEMS Sensing Element: Tiny suspended structures move when subjected to acceleration forces.
2. Capacitance Measurement: Internal circuitry measures changes in capacitance caused by the movement of these structures.
3. Digital Conversion: The sensor converts capacitance variations into digital acceleration values.
4. Multi-Axis Processing: Independent sensing elements provide acceleration data for X, Y, and Z axes.
5. Communication Interface: Data is transmitted to the host microcontroller through I2C or SPI.

Interaction with MCU (Microcontroller Unit):

1. Power Connection: Connect the module to a 3V or 5V power source.
2. Interface Selection: Use the Grove I2C connector for quick integration or configure SPI if required.
3. Data Acquisition: The MCU reads acceleration registers through I2C or SPI communication.
4. Motion Processing: Software interprets acceleration data to determine movement, tilt, vibration, or orientation.
5. Interrupt Events: Motion or free-fall events can trigger hardware interrupts for efficient system response.

Pinout:

Applications:

1. Free-fall detection systems
2. Motion sensing applications
3. Pedometers and fitness trackers
4. Gaming controllers and VR devices
5. Robotics and autonomous navigation
6. Vibration monitoring systems
7. Industrial equipment monitoring
8. Impact detection and event logging
9. Orientation and tilt sensing
10. Smart wearable devices

Circuit:

Library:

To simplify communication with the LIS3DHTR sensor, install the official Grove LIS3DHTR library from Seeed Studio.

Link

Code:

#include "LIS3DHTR.h"
#include <Wire.h>
LIS3DHTR<TwoWire> LIS;
void setup() {
 Serial.begin(9600);
 LIS.begin(Wire, 0x19);
 if(!LIS) {
 Serial.println("LIS3DHTR not found.");
 while(1);
 }
 LIS.setOutputDataRate(LIS3DHTR_DATARATE_50HZ);
 LIS.setFullScaleRange(LIS3DHTR_RANGE_2G);
}
void loop() {
 Serial.print("X: ");
 Serial.print(LIS.getAccelerationX());
 Serial.print(" Y: ");
 Serial.print(LIS.getAccelerationY());
 Serial.print(" Z: ");
 Serial.println(LIS.getAccelerationZ());
 delay(500);
}

Code Explanation:

1. Initialization: Initializes I2C communication and the LIS3DHTR sensor.
2. Device Detection: Verifies that the sensor is connected and responding.
3. Configuration: Sets the output data rate and measurement range.
4. Reading Data: Continuously retrieves acceleration values for X, Y, and Z axes.
5. Output: Prints acceleration measurements to the Serial Monitor.

Technical Specifications:

• Sensor Chip: LIS3DHTR
• Measurement Axes: X, Y, Z
• Measurement Range: ±2g, ±4g, ±8g, ±16g
• Supply Voltage: 3V / 5V
• Communication Interfaces: I2C, SPI, GPIO ADC
• Default I2C Address: 0x19
• Alternative I2C Address: 0x18 (SDO connected to GND)
• ADC GPIO Input Range: 0 – 3.3V
• Interrupt Output: Supported
• Temperature Compensation: Supported
• Low Power Operation: Yes

Resources:

• LIS3DHTR Datasheet
• Hardware Schematic
• Grove LIS3DHTR Arduino Library