pixl.js with analog moister sensor

Hello!
I have a analog moister sensor, how do I make it work? How can I read the proper values from pin A0. I have a CR2032 battery. And i think the sensor can run on 3,3V

function onTimer() {
  // Get the soil moister as a string
  var h = analogRead(A0);
  
  // Clear display
  g.clear();
  // Use the small font for a title
  g.setFontBitmap();
  g.drawString("Soil moister:");
  // Use a large font for the value itself
  g.setFontVector(30);
  g.drawString(h, (g.getWidth()-g.stringWidth(h))/2,10);
  // Update the screen
  g.flip();
}

// Update soil moister every 2 seconds
setInterval(onTimer,2000);
// Update soil moister immediately
onTimer();

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