const int  analogpin=A0;
int sensorvalue=0;
float voltage=0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  sensorvalue=analogRead(analogpin);
  voltage=sensorvalue*(5.0/1023.0);
  int digitalvalue=map(sensorvalue,0,1023,0,255);
  Serial.print("Analog readings ");
  Serial.print(sensorvalue);
  Serial.print("voltage ");
  Serial.print(voltage);
  Serial.print("V,digital value: ");
  Serial.println(digitalvalue);
  delay(1000);
}