4 Channels Analog Data Recorder

 using 

Raspberry PI 4 and I2C  ADS1115 .

Introduction

    The project addresses the need for a convenient small, fast and cheap analog voltage recorder which will mainly be able to record the data on an USB stick  in csv format readable on Linux and  Windows computers.

Components used:

    1. Raspberry PI 4 with 4 GB of RAM ( can be a PI 2 with 1 GB though)

    2. 4 channels AD converter with I2C communication

    4. Appropriate number   of switches and LEDs for control and communication

    5. USB drive ( USB3 recommended) formatted fat32 under Windows. (recommended name : VOLUME_NEW)

Principle of work:
    1. To record data before the recorder is powered on  the USB drive will be inserted in the appropriate USB port.
    2. For the USB drive to be used for recording it has to be identified in the etc/fstab file with its UUID. ( See:........)
    3. The identification for a drive has to be done only one time
    4. After the recorder is powered , ( no KB, mouse or screen attached)  the system will start  in  CLI  (command line interface) and star the measuring and recording program.
    5. Based on Switches configuration the recorder will start to read and write on the USB drive the recorded channels and time from the start of the measurements.
    6. The stop of the measurements is done by pressing the control  / stop button. After that the recorder can be turned OFF.
    7. Extract the USB drive and read it with the post-processing computer / software.
     8. Some basic maintenance of the USB drive can be done from the recorder itself   as erasing all files on the drive or resetting the serialization number.