Hi. I’d like to connect up to 10 water atomization modules to Arduino Mega at once. They shouldn’t run simultaneously however, so while one is active, the others should be set to low.
1. Can I connect the modules directly to the Arduino pins without using the Grove Shield? Do I need 4 pins or only 3 pins for each module? Do I need to connect to special pins, digital or analogue ones?
2. Do I need an external power supply or can I simply use the 5V of Arduino (to keep 1 module active and the others at low)?
3. Is direct contact with water required, or can I use a damp sponge or cotton instead?