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Installation Manual

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Buzzer signal
The Buzzer (Beeper) signal output is provided in the E4000 using the PWM mode in the Buzz pin (PIN9). When
the E4000 is started, the reading is successful, etc., the PWM signal is output on the Buzz pin according to the
setting. The signal output can drive the buzzer to sound a sound through an external matching circuit. The Buzz pin
has limited load capacity and cannot directly drive the buzzer to sound, so as not to damage the chip on the E4000.
The buzzer drive circuit that can be referred to is as follows: