Turn gauge arc into gradient

[tony]

@Interalia

you saw, list contains two elements

It only contains 2 elements if the serial Port delivers 2 values.
Take a look at this thread:

[SOLVED] ArrayIndexOutOfBoundsException: 1

Using an arduino Mega to collect temperature and humidity data then using Processing to display data on meters. Everything works fine for a few seconds then I receive this error: ArrayIndexOutOfBoundsException: 1. Not sure why? Arduino Code: #include <Wire.h> #include "Wire.h" #include "Adafruit_HTU21DF.h" #include <SPI.h> #include <SoftwareSerial.h> extern "C" { #include "utility/twi.h" // from Wire library, so we can do bus scanning } uint8_t readline(char *buff, uint8_t maxbuff, uint16_t…