With this shield the D1 Mini can be extended by a buzzer / acoustic signal generator.
• Supply voltage: 5 V• Frequency: 1 .
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3 kHz• signal pin must be defined before use (D5 / D6 / D7 / D8)Pin assignment• 5 V: 5 V supply voltage• D5 / D6 / D7 / D8: signal pin• GND: GroundNote:Delivery includes 2 pin headers