Thank you! I was looking for weeks to get a somewhat reliable SPL-meter working, even teared down two other cheap ones... sadly the smaller version of this one doesn't seem to have any analog output.Can you clarify what the actual "Hack" is to get the thing starting without a button-push? I thought closing the switch-pad area with solder on the PCB would do that trick? Anyway, does it also have the auto-standby mode?The smaller one turns of after like 10-15 mins. A transistor could be used connecting the switch-pads and controlled by a digital-pin on the Arduino.... at least that was my idea to avoid the standby.