SensorHub Library

Overview

SensorHub is a core communication and data processing hub for I2C-based sensors. It provides essential I2C read and write operations, making it easier to integrate various sensor classes for data acquisition and processing. The library supports multi-byte transactions, configurable communication modes, and device connectivity verification. Additionally, it includes I2S support for ADC-based sensors on platforms that support it.

Features

• I2C Communication Support

  • Read and write operations for single and multi-byte transactions.
  • Support for big-endian and little-endian data formats.
  • Configurable I2C communication mode.
  • Device connectivity verification.

• I2S Communication Support (Only for SOCs that support ADC over I2S)

  • Configurable word select (WS), bit clock (BCLK), and data pins.
  • Supports stereo, left, and right channel selection.
  • Customizable sampling rate.

Compatibility

The SensorHub library is compatible with:

• ESP32 (Supports both I2C and I2S communication)
• Arduino Due (Supports only I2C communication)
• Other boards with I2C support

Installation

1. Download the repository or clone it:

   git clone https://github.com/yourusername/SensorHub.git

2. Copy the SensorHub folder into your Arduino libraries directory:

   Documents/Arduino/libraries/
   

3. Restart the Arduino IDE.
4. Include the library in your code:

   #include <SensorHub.h>

Usage

1. Initialize an I2C Sensor

To use an I2C-based sensor, initialize the SensorHub object with the sensor's I2C address:

#include <SensorHub.h>

SensorHub sensor(0x40);  // Example I2C address

void setup() {
    Serial.begin(115200);
    if (sensor.is_sensor_connected()) {
        Serial.println("Sensor connected!");
    } else {
        Serial.println("Sensor not found.");
    }
}

void loop() {
    // Add sensor reading logic here
}

2. Writing Data to an I2C Register

sensor.i2c_execute(0x01, 0xFF); // Write 0xFF to register 0x01

3. Reading Data from an I2C Register

uint8_t data;
sensor.i2c_readByte(0x02, &data, 1);
Serial.print("Register Value: ");
Serial.println(data, HEX);

4. Reading Multi-Byte Data (Little-Endian)

uint16_t value;
sensor.i2c_read_Xbit_LE(0x03, &value, 16);
Serial.println(value);

5. Using I2S-Based Sensors (ESP32 Only)

To initialize an I2S-based sensor:

#ifdef ARDUINO_ARCH_ESP32
SensorHub i2sSensor(25, 26, 27, 16000, I2S_CHANNEL_LEFT);
#endif

API Reference

Constructor

I2C Sensor Initialization

SensorHub(uint8_t addr);

• addr: I2C address of the sensor.

I2S Sensor Initialization (ESP32 Only)

SensorHub(uint8_t ws, uint8_t bclock, uint8_t data, uint32_t samplingRate, uint8_t channel);

• ws: Word select pin.
• bclock: Bit clock pin.
• data: Data pin.
• samplingRate: Desired sampling rate.
• channel: I2S_CHANNEL_LEFT, I2S_CHANNEL_RIGHT, or I2S_CHANNEL_STEREO.

I2C Methods

Write Operations

void i2c_execute(uint8_t reg, uint8_t data);
void i2c_execute_16bit(uint8_t reg, uint16_t data);

• Writes data to the specified register.

Read Operations

bool i2c_readByte(uint8_t reg, uint8_t *data, uint8_t length);
bool i2c_readByte(uint8_t reg, int8_t *data, uint8_t length);

• Reads one or more bytes from the given register.

Multi-Byte Read (Little-Endian & Big-Endian)

template <typename T>
bool i2c_read_Xbit_LE(uint8_t reg, T *data, uint8_t length);

template <typename T>
bool i2c_read_Xbit(uint8_t reg, T *data, uint8_t length);

• Reads a multi-bit value from the register.

I2C Configuration

void set_i2c_mode(uint8_t mode);

• Sets the I2C communication mode.

Sensor Connectivity Check

bool is_sensor_connected();

• Returns true if the sensor is detected over I2C.

License

This library is open-source and available under the MIT License.

Author

Developed by Saurav Sajeev.