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Voltage level（0V-3V）
There are commonly used PWM ports, namely P0, P1, P2, P3, P4 and P10.
And there are other rarely used ports, namely P5, P6, P7, P8, P9, P11, P12,
P13, P14, P15, P16, P19 and P20.
In the experiment, we connect the port S of yellow LED Module to the port
S (16) of the expansion board. And P16 can also be used as a PWM
interface.
(2)Yellow LED：
Working
DC 3.3-5V
Voltage:
Working
< 20mA
Current：
Max
0.1W
Power：
Control
digital
Port:
(digital input）
Working
-10°C ~ +50°C
Temperat
port
249
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