08:15:30.735 ->
08:15:30.735 -> ********************************************************************
08:15:30.829 -> Serial Initialized
08:15:30.829 -> --------------------------------------------------------------------
08:15:30.922 -> I2CexpDiag - i2c LCD i/o expander backpack diagnostic tool
08:15:30.969 -> --------------------------------------------------------------------
08:15:31.062 -> hd44780 lib version: 1.3.2
08:15:31.062 -> --------------------------------------------------------------------
08:15:31.156 -> Reported Arduino Revision: 1.8.16
08:15:31.202 -> CPU ARCH: AVR - F_CPU: 16000000
08:15:31.202 -> --------------------------------------------------------------------
08:15:31.296 -> SDA digital pin: 18 A4
08:15:31.296 -> SCL digital pin: 19 A5
08:15:31.342 -> --------------------------------------------------------------------
08:15:31.436 -> Checking for required external I2C pull-up on SDA - NO
08:15:31.482 -> Checking for required external I2C pull-up on SCL - NO
08:15:31.529 -> Checking for I2C pins shorted together - Not Shorted
08:15:31.669 -> ********************************************************************
08:15:31.763 -> WARNING: I2C requires external pullups for proper operation
08:15:31.809 -> It may appear to work without them, but may be unreliable and slower
08:15:31.903 -> Do not be surprised if it fails to work correctly
08:15:31.950 -> Install external pullup resistors to ensure proper I2C operation
08:15:31.996 -> ********************************************************************
08:15:32.090 -> --------------------------------------------------------------------
08:15:32.136 -> Scanning i2c bus for devices..
08:15:32.230 -> Total I2C devices found: 0
08:15:32.276 -> No I2C devices found