I want to see the values from the analog pin on the Arduino Uno printed out in Processing. It works fine in Arduino, but I can't even get a zero to pop up from processing (which seems to be the usual complaint), just an empty gray box.

Here is my Arduino Code:

1. #include <Boards.h>
   #include <Firmata.h>
   
   
   
   const int voltPin = 0;
   float denominator;
   int resistor1 = 51000;        //resistors from amp
   int resistor2 = 4300;       
   int inputPin = A0;
   
   void setup() {
     Serial.begin(9600);
     denominator = (float)resistor2 / (resistor1+resistor2);
   }
   void loop() {
     float analogvoltage;
     float voltagereading;
     float finalvoltage;
     analogvoltage= analogRead(A0);
     voltagereading=(analogvoltage/1024)*5;      //percent of total bits used times voltage range
     finalvoltage=analogvoltage/denominator;   //voltage adjusted for amp
     Serial.println(finalvoltage, 10);        //returns value, to ten decimal places
     delay(10);