Trying to read analog input bolt V3

Hello,
I am trying to read analog input from the arduino embedded board on the bolt v3 but I am having trouble reading the signal. The voltage arriving at the input works fine (measured with a multimeter) but there is a problem with the code apparently.
Can someone verify the validity of the code and let me know if it looks correct?
Thank you

//
int roboteqPin = 3;

// actuator encoders
int fL = A5; // frontLeft
int bL = A4; // backLeft
int fR = A3; // frontRight
int bR = A2; // backRight

// Initialize storing variables
int f_L = 0;
int b_L = 0;
int f_R = 0;
int b_R = 0;

// endpoint signals
int encIn_fL = 8;
int encOut_fL = 9;

void setup() {
// put your setup code here, to run once:

Serial.begin(9600);

//pinMode(roboteqPin, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(encIn_fL, INPUT);
pinMode(encOut_fL, INPUT);
}

void loop() {

//digitalWrite(roboteqPin, LOW); // set DO to switch on RoboteQ

digitalWrite(6, LOW);

digitalWrite(7, HIGH);

b_L = analogRead(A4);
float voltage = b_L * (5.0 / 1023.0);
Serial.print("Bits:");
Serial.print(b_L);
Serial.print("\n");
Serial.print("Voltage:");
Serial.print(voltage);
Serial.print("\n");
}