piezo coax cable

Hello, please i need some help

I have a problem figuring out a circuit for this cable Piezo_cable

i want to use it to trigger an interrupt on arduino , when i step on the cable it gives around 0.5v, i tried a voltage comparator but i cant make it work correctly, sometimes the output is not right and other times i hace a retriggering problem.

Can someone please point me to a circuit for this cable.
Hope someone can help me , thanks

Never worked with piezo cable.
I think charge amplifiers are used.

Don’t know why you want to use an interrupt.
Stepping on it is a slow process, and can be done with polling.
Try this improved knock sensor sketch I wrote for a normal piezo.

// knock sensor/alarm
// Piezo, with 1Megohm load resistor across, connected to A0 and ground
// optional 5volt buzzer on pin 13

int threshold = 100; // alarm threshold from 1 (very sensitive) to 1022 <<<<<<<<
int alarmDuration = 100; // alarm duration in milliseconds <<<<<<<<

const byte piezoPin = A0;
int rawValue; // raw A/D readings
int piezoValue; // peak value
const byte onboardLED = 13; // onboard LED and/or buzzer

void setup() {
  analogReference(INTERNAL); // remove this line if too sensitive
  Serial.begin(115200); // serial monitor for raw piezo output
  pinMode (onboardLED, OUTPUT);

void loop() {
  // reset
  piezoValue = 0;
  // read
  for (int x = 0; x < 250; x++) { // multiple A/D readings
    rawValue = analogRead(piezoPin);
    if (rawValue > piezoValue) {
      piezoValue = rawValue; // store peaks
  // print
  if (piezoValue > 0) {
    Serial.print(F("Piezo value is "));
  // action
  if (piezoValue > threshold) {
    Serial.print(F("Knock was over the threshold of "));
    digitalWrite (onboardLED, HIGH);
    digitalWrite (onboardLED, LOW);