void setup() {
  pinMode(A0, INPUT);
  pinMode(A1, INPUT);
  pinMode(A2, INPUT);
  pinMode(A3, INPUT);

  Serial.begin(115200);
  Serial.println("Serial Start");

}
int ch1;
int ch2;
int ch3;
int ch4;
int startTime;
int endTime;
int endTime2;

void printDebug() {
  Serial.print("Time: ");
  Serial.print(endTime - startTime);
  Serial.print("\t");

  Serial.print("Time2: ");
  Serial.print(endTime2 - endTime);
  Serial.print("\t");

  Serial.print("CH1: ");
  Serial.print(ch1);
  Serial.print("\t");

  Serial.print("CH2: ");
  Serial.print(ch2);
  Serial.print("\t");

  Serial.print("CH3: ");
  Serial.print(ch3);
  Serial.print("\t");

  Serial.print("CH4: ");
  Serial.print(ch4);
  Serial.print("\n");
}

void loop() {
  //Time: 79	CH1: 1988	CH2: 1988	CH3: 994	CH4: 994 -> 4CH 500Hz
  //Time: 39	CH1: 1989	CH2: 1988	CH3: 995	CH4: 995 -> 2CH 500Hz 2CH 1000Hz
  //Time: 39	CH1: 1988	CH2: 1488	CH3: 995	CH4: 995 -> 4CH 1000Hz
  startTime = millis();

/*
  ch1 = pulseIn(A0, HIGH);
  ch2 = pulseIn(A1, HIGH);
  ch3 = pulseIn(A2, HIGH);
 */
  ch4 = pulseIn(A3, HIGH);

  endTime = millis();
/*
  ch1 = map(ch1, 1000, 2000, -10, 10);
  ch2 = map(ch2, 1000, 2000, -10, 10);
  ch3 = map(ch3, 1000, 2000, -10, 10);
  ch4 = map(ch4, 1000, 2000, -10, 10);
*/
  endTime2 = millis();
  printDebug();

}