volt meter

I made a volt meter!

using the arduino board to measure voltage

All I have is a jumper wire poked into the analog pin 0 receptacle.  At samples 3 and 4 I have touched the end of the wire, bringing the voltage to ground.  Pretty exciting!  The code is below.

I’m working towards building my lightning detector.  I have a simple coherer, but haven’t gotten to see if it actually works yet.

// a simple volt meter
// version 0.1

float Vref = 5; // volts

int Rate = 1; // hz
int del = 1/Rate * 1000; // sample rate, ms

int vpin = 0; // which pin should be used to measure the voltage
              // make sure you connect the arduino system ground to the same
              // as the measurement system

int val_adc = 0; // adc counts
float val_volts = 0; // volts

int i = 0;

void setup() {
  Serial.begin(9600);
  Serial.print("delay between samples is ");
  Serial.print(del);
  Serial.println(" ms");
}

void loop() {
  delay(del);
  val_adc = analogRead(vpin);
  val_volts = Vref * (float(val_adc) / 1023);
  Serial.print(i);
  Serial.print(": adc reads ");
  Serial.print(val_adc);
  Serial.print(" counts = ");
  Serial.print(val_volts);
  Serial.println(" volts.");
  i++;
  if (i >= 10) {
    i = 0;
  }
}

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