Product Description

Sound sensor module (voice control switch, audio detection/analog + digital)

Product description:

1. Original audio processing chip (LM393, LM386)

2. Can amplify the audio signal by 200 times 

3. The output audio signal amplitude is adjustable

4. The sensitivity of the output digital signal is adjustable

5. Add noise-eliminating resistors to suppress the generation of bottom noise

6. Adopt single-point grounding wiring to reduce loop gain and improve audio signal quality

7. Use large-capacity tantalum capacitors to filter the power supply to stabilize the power supply and reduce interference

8. Small board PCB size: 51mm*24mm

Module interface description:

1. VCC: External 3.3-5.2V DC power supply

2. GND: External GND power ground

3. AO: Analog output interface

4. DO: digital output interface

5. Adjustable sensitivity: W1 and W2 adjustable resistors (the module microphone is placed horizontally to the left, the adjustable resistor is W1 on the left and W2 on the right)

Product Usage:

The sound of the surrounding environment can be converted into an electrical signal to detect the sound of the surrounding environment. The AO output is an analog audio signal, which can be directly connected to the corresponding sound-producing equipment for sound playback. The sound level can be adjusted by the W1 adjustable resistor; the AO terminal can also be used for ADC operation to collect signals for more applications.

The sound of the surrounding environment can be detected. The sound threshold is adjusted through the potentiometer. When the sound exceeds this threshold, the DO pin will output a low level. Through the detection of the DO pin, it is possible to detect whether the sound exceeds the set threshold.

Use and adjustment method of analog quantity:

1. Connect VCC and GND (you can see the L1 power indicator light is on), turn W2 counterclockwise to the end (to prevent L2 from always on), then turn W1 clockwise to the end and then slowly adjust the W1 potentiometer counterclockwise until it finds The sensitivity state that suits your needs will stop (W1 is turned counterclockwise to the end to maximize the sensitivity).

2. At this time, the AO terminal can be connected to the ADC chip or the ADC pin of the single-chip microcomputer for ADC operation to obtain the amplitude change value of the sound for more flexible secondary development; the AO terminal can also be directly connected to a small speaker or Headphones, which can play the amplified audio signal.

3. Note: When operating as an ADC, the AO terminal needs to be connected to a 1k-10K pull-down resistor to the ground, and when it is only connected to a speaker and other broadcasting equipment, there is no need to connect a pull-down resistor.

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