Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino UNO R4 WiFi microcontroller and an Adafruit LIS3DH Triple-Axis Accelerometer. The Arduino is used to read data from the accelerometer via I2C communication. The document includes a component list, wiring details, and documented code for the microcontroller.

Component List

Arduino UNO R4 WiFi

• Description: A microcontroller board based on the ATmega328P, featuring built-in WiFi capabilities.
• Pins: OFF, GND, VRTC, IIC0_SCL, IIC0_SDA, 3V3, GPIO 41, GPIO 0, GPIO 42, GPIO 43, GPIO 44, BOOT, IOREF, RESET, 5V, VIN, A0, A1, A2, A3, A4, A5, RSPCKA, CIPO, COPI, D0/RX, D1/TX, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, AREF, SDA, SCL

Adafruit LIS3DH Triple-Axis Accelerometer

• Description: A low-power accelerometer with a digital interface, capable of measuring acceleration in three axes.
• Pins: CS, SDO, ADC1, ADC2, ADC3, INT2, VCC, 3.3V, GND, SCL, SDA, INT1

Wiring Details

Arduino UNO R4 WiFi

• GND: Connected to GND of Adafruit LIS3DH Triple-Axis Accelerometer
• VIN: Connected to VCC of Adafruit LIS3DH Triple-Axis Accelerometer
• SDA: Connected to SDA of Adafruit LIS3DH Triple-Axis Accelerometer
• SCL: Connected to SCL of Adafruit LIS3DH Triple-Axis Accelerometer

Adafruit LIS3DH Triple-Axis Accelerometer

• GND: Connected to GND of Arduino UNO R4 WiFi
• VCC: Connected to VIN of Arduino UNO R4 WiFi
• SDA: Connected to SDA of Arduino UNO R4 WiFi
• SCL: Connected to SCL of Arduino UNO R4 WiFi

Documented Code

Arduino UNO R4 WiFi Code

/* If you want to use NEAI functions please, include NEAI library
 * in your Arduino libraries then, uncomment NEAI parts in the following code
 */

/* Libraries part */
#include <Wire.h>
#include <Adafruit_LIS3DH.h>
#include <Adafruit_Sensor.h>

/* Macros definitions */
#define SERIAL_BAUD_RATE  115200

/* Default address is 0x18 but, if SDO is powered at 3v3,
 *  address is set to 0x19, so you need to change it
 *  depending on your current hardware configuration.
 */
#define SENSOR_I2C_ADDR 0x18

/* Sensor data rates.
 * You can choose from:
 * LIS3DH_DATARATE_1_HZ
 * LIS3DH_DATARATE_10_HZ
 * LIS3DH_DATARATE_25_HZ
 * LIS3DH_DATARATE_50_HZ
 * LIS3DH_DATARATE_100_HZ
 * LIS3DH_DATARATE_200_HZ
 * LIS3DH_DATARATE_400_HZ
 * LIS3DH_DATARATE_LOWPOWER_1K6HZ
 * LIS3DH_DATARATE_LOWPOWER_5KHZ
 */
#define SENSOR_DATA_RATE LIS3DH_DATARATE_400_HZ

/* Sensor ranges.
 * You can choose from:
 * LIS3DH_RANGE_16_G
 * LIS3DH_RANGE_8_G
 * LIS3DH_RANGE_4_G
 * LIS3DH_RANGE_2_G
 */
#define SENSOR_RANGE LIS3DH_RANGE_2_G

/* NanoEdgeAI defines part
 * NEAI_MODE = 1: NanoEdgeAI functions = AI Mode.
 * NEAI_MODE = 0: Datalogging mode.
 */
#define NEAI_MODE 1
#define SENSOR_SAMPLES 256
#define AXIS  3

Adafruit_LIS3DH lis = Adafruit_LIS3DH();

/* Global variables definitions */
static uint16_t neai_ptr = 0;
static float neai_buffer[SENSOR_SAMPLES * AXIS] = {0.0};

/* Initialization function: In this function,
 *  code runs only once at boot / reset.
 */
void setup() {
  /* Init serial at baud rate 115200 */
  Serial.begin(SERIAL_BAUD_RATE);

  /* Init I2C connection between board & sensor */
  if(!lis.begin(SENSOR_I2C_ADDR)) {
    Serial.println("Can't initialize I2C comm with LIS3DH sensor...\n");
    while(1);
  }
  Serial.println("OK");
  /* Init LIS3DH with desired settings: odr & range */
  lis.setRange(SENSOR_RANGE);
  lis.setDataRate(SENSOR_DATA_RATE);

  delay(1000);
}

/* Main function: Code run indefinitely */
void loop() {
  /* Get data in the neai buffer */
  while(neai_ptr < SENSOR_SAMPLES) {
     /* Check if new data if available */
    if(lis.haveNewData()) {
      /* If new data is available we read it ! */
      lis.read();
      /* Fill neai buffer with new accel data */
      neai_buffer[AXIS * neai_ptr] = (float) lis.x;
      neai_buffer[(AXIS * neai_ptr) + 1] = (float) lis.y;
      neai_buffer[(AXIS * neai_ptr) + 2] = (float) lis.z;
      /* Increment neai pointer */
      neai_ptr++;
    }
  }
  /* Reset pointer */
  neai_ptr = 0;

  /* Print the whole buffer to the serial */
  for(uint16_t i = 0; i < AXIS * SENSOR_SAMPLES; i++) {
    Serial.print((String)neai_buffer[i] + " ");
  }
  Serial.print("\n");

  /* Clean neai buffer */
  memset(neai_buffer, 0.0, AXIS * SENSOR_SAMPLES * sizeof(float));
}

Adafruit LIS3DH Triple-Axis Accelerometer Code

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

This document provides a comprehensive overview of the circuit, including the components used, their wiring, and the code running on the microcontroller.