Help on momentary push switches in series.

Using Arduino General Electronics
9

Here some code to test 13 button wired up as I posted

const int keyMin = 0;      // Keymin, discovered through experiment
const int keyMax = 1023;    // keymax, discovered through experiment
void setup() {
  Serial.begin(9600);
}
void loop() {
  // read the sensor:
  int key = analogRead(A0);
  // map the sensor range to a range of four options:
  int keyValue = map(key, keyMin, keyMax, 0, 3);

  // do something different depending on the 
  // range value:
  switch (keyValue) {
  case 0:    // your hand is on the sensor
    Serial.println("button1");
    break;
  case 1:    // your hand is close to the sensor
    Serial.println("button2");
    break;
  case 2:    // your hand is a few inches from the sensor
    Serial.println("button3");
    break;
  case 3:    // your hand is nowhere near the sensor
    Serial.println("button4t");
    break;
    case 4:    // your hand is nowhere near the sensor
    Serial.println("button5");
    break;
case 5:    // your hand is nowhere near the sensor
    Serial.println("button6");
    break;
case 6:    // your hand is nowhere near the sensor
    Serial.println("button7");
    break;
case 7:    // your hand is nowhere near the sensor
    Serial.println("button8");
    break;
case 8:    // your hand is nowhere near the sensor
    Serial.println("button9");
    break;
case 9:    // your hand is nowhere near the sensor
    Serial.println("button10");
    break;
case 10:    // your hand is nowhere near the sensor
    Serial.println("button11");
    break;
case 11:    // your hand is nowhere near the sensor
    Serial.println("button12");
    break;
case 12:    // your hand is nowhere near the sensor
    Serial.println("button13");
    break;

  } 
  delay(1);        // delay in between reads for stability
}