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Example 2 - ESP32 LittleFS - Using LittleFS for setting storage

Another simple example to show the basic setup and use of SparkFun Qwiic Universal Auto-Detect when using LittleFS to store the sensor configuration. This example was written for the SparkFun ESP32 Thing Plus C (SPX-18018) but can be adapted for many platforms.

Key Features

  • Declaring a SFE_QUAD_Sensors object
  • Detecting which sensors are connected
  • Initializing the sensors
  • Setting up a menu
  • Configuring the sensor settings through the menu system
  • Writing the settings to LittleFS
  • Reading the settings back from LittleFS and applying them

This example is almost identical to Example1. Please see the Example1 documentation for a full walk-through of the code.

The only differences in this example are:

Setup

After installing this library in your local Arduino environment, begin with a standard Arduino sketch and include the header files for LittleFS and this library:

#include <LittleFS.h> // Include LittleFS.h to enable support for SFE_QUAD_Sensors__LittleFS. Do this before #include "SFE_QUAD_Sensors.h"

#include "SFE_QUAD_Sensors.h" // Click here to get the library:  http://librarymanager/All#SparkFun_Qwiic_Universal_Auto-Detect

The next step is to declare the object for the SparkFun Qwiic Universal Auto-Detect. Like most Arduino sketches, this is done at a global scope (after the include file declaration), not within the setup() or loop() functions.

For this example, the SFE_QUAD_Sensors__LittleFS class is used. The sensor configuration will be stored in LittleFS.

SFE_QUAD_Sensors__LittleFS mySensors;

Other examples show how to use the other Sensors classes: EEPROM and SD.

Initialization

Because we are using LittleFS to store the configuration, the call to beginStorage in setup() changes to:

  if (!mySensors.beginStorage("/Config.csv") // Begin the SD storage: "/config.csv" is the file which holds the configuration
  {
    Serial.println(F("beginStorage failed! You will not be able to write or read the sensor configuration..."));
  }