SunFounder ESP32 Starter Kit
• It is a submersible pump and should be used that way. It tends to heat too much that there’s a risk of
overheating if you turn it on unsubmerged.
Example
• 4.2 Pumping (Arduino Project)
• 6.6 Plant Monitor (Arduino Project)
• 4.2 Pumping (MicroPython Project)
• 6.8 Plant Monitor (MicroPython Project)
Controller
5.20 Button
Buttons are a common component used to control electronic devices. They are usually used as switches to connect
or break circuits. Although buttons come in a variety of sizes and shapes, the one used here is a 6mm mini-button as
shown in the following pictures. Pin 1 is connected to pin 2 and pin 3 to pin 4. So you just need to connect either of
pin 1 and pin 2 to pin 3 or pin 4.
The following is the internal structure of a button. The symbol on the right below is usually used to represent a button
in circuits.
Since the pin 1 is connected to pin 2, and pin 3 to pin 4, when the button is pressed, the 4 pins are connected, thus
closing the circuit.
734 Chapter 5. Learn about the Components in Your Kit
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