Cat Flap

I was just fiddling with this and, maybe you could try this:

Puck.accelOn(26);
Puck.accelWr(0x15,0x10);  // CTRL6-C - XL_HM_MODE=1, low power accelerometer
Puck.accelWr(0x16,0x80);  // CTRL6-C - G_HM_MODE=1, low power gyro
Puck.accelWr(0x0D,0x00); // INT1_CTRL - disable
Puck.accelWr(0x11,0); // CTRL2_G power down gyro
//Puck.accelWr(0x10,0x60);  // CTRL1_XL accelerometer 416hz
Puck.accelWr(0x10,0x20);  // CTRL1_XL accelerometer 26hz
Puck.accelWr(0x58,0x90); // TAP_CFG - enable irq, add filter
Puck.accelWr(0x5C,0x02); // WAKE_UP_DUR - very low duration
Puck.accelWr(0x5B,0x02); // WAKE_UP_THS - low threshold
Puck.accelWr(0x5E,0x20);  // MD1_CFG wakeup on INT1

var idleTimeout;
Puck.on('accel',a=>{  
  LED.set();
  if (idleTimeout) clearTimeout(idleTimeout);
  else print("Motion", a);
  idleTimeout = setTimeout(function() {
    idleTimeout = undefined;
    LED.reset();
  },500);
  // 32 is tilt
});

It'll stop the accelerometer from waking up Espruino at all, except when there's movement when it'll give you a series of pulses (picked up by the accel event).

Should be super low power :)