When reed switch is opened, pin 2 of Arduino goes high with the help of the pull-up resistor R2, and the alert signal is available through the piezo-speaker PZ1 (not an active piezo-buzzer). At the ...

Nano Sensor Interface * Arduino Nano (v3) in Sleep Mode * T.K.Hareendran/2018 ... The trigger pin can be connected to an external sensor, a Reed switch, or a photoresistor, for instance. It is often ...

He suspected EMF interference so as a quick first step he decided to throw together an EMF detector using an Arduino. It uses a bank of LEDs as an indicator bar to reflect the EMF picked up by the ...

Interestingly enough, most of the magic is done with simple reed ... to the Arduino Uno which handles the user interface. Wind speed, on the other hand, it done with a single reed switch as ...