   Serial.write(oB);
 }
 
-float sensV()
+float sensV() // measure the voltage
 {
   sumSamples = 0;
 


int serialRX()
{
  // read a a byte from the serialbuffer
  iB = Serial.read();
}

void serialTX(byte oB)
{
  if (oB == 13)
  {
    Serial.write(11);

float voltage = 0.0;
unsigned long startTime;
unsigned long elapsedTime;
byte cmd = 0;
byte iB = 0;

void setup()
