Keyestudio ESP32 - 3. Wiring Diagram; 4. Test Code

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ESP32 Starter Kit

Triode switch: Brieﬂy, LED lights up when the base(pin 1) is at a high level. In the same breath, the collector(pin 3)

and emitter(pin 2) are connected, and then VCC passes through a current-limiting resistor to LED and ﬁnally to GND,

which forms a circuit. On the contrary, LED goes oﬀ when the base is at low. In this circumstance, the collector and

emitter are disconnected and the LED lights oﬀ.

3. Wiring Diagram

9.2.3 4. Test Code

According to previous principles, we can control LED via levels of pins on the development board.

1. Drag the following block in “Events” part.

2. Drag the following block in “Control” part .

166 Chapter 9. Scratch Tutorial