Raspberry PI 4 based data recorder

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 i...