MOSFET IRFZ44N N-Channel TO-220 - 55V 49A High-Current universal gearbox You will also need some

You will also need some required accessories to make Feather FONA work

The WROOM-32 is a bare SMD module for PCB integration

Electrical Conductivity K1 Sensor Kit for Arduino Electrical Conductivity K1 Sensor Kit helps you measure the conductivity of water for quality checks

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It will not fit an Arduino Mega

MOSFET IRFZ44N N-Channel TO-220 - 55V 49A High-Current universal gearbox You will also need someMOSFET, or metal oxide semiconductor field effect transistor, is a four terminal semiconductor device used for switching and amplifying signals. MOSFETs are voltage controlled devices. This means in order to use them, you need first to overcome a threshold voltage. Beginners often stick to MOSFETS for this particular feature. Because compared to BJT (Bipolar Junction Transistor), which is current controlled, you can directly drive a MOSFET using a