start sign

I want my car to start driving after a 1800 Hz beep. Is this possible? i have the following microphone: How to Connect a Microphone to an Arduino

Difficult task.

U’ll have to buy/build a narrow bandpassfilter to filter out this exact freqency. (many components)

easier to use your IR remotecontrol (any…maybe your phone). This requires only the IR receiver as addition electronics.

TSOP4838 costs <$2