Microphone Wireling Tutorial

This Wireling uses the SPW2430 MEMS Microphone to detect sound and output an analog signal.

Technical Details

SPW2430 Specs

• Consists of an acoustic sensor, a low noise input buffer, and an output amplifier
• Low Current
• MaxRF protection
• Ultra-Stable performance

TinyDuino Power Requirements

• Voltage: 3.0V - 5.5V 
• Current: 70-110 µA (Normal Mode). Due to the low current, this board can be run using the TinyDuino coin cell option

Pins Used

• A5/SCL - I²C Serial Clock line
• A4/SDA - I²C Serial Data line 

Dimensions

• 10mm x 10mm (.394 inches x .394 inches)
• Height (from the lower bottom of Wireling to upper top Wireling Connector): 3.70mm (0.15 inches)
• Weight: 1 gram (.04 ounces)

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Materials

Processor	Adapter
*TinyDuino and USB TinyShield	Wireling Adapter TinyShield
*TinyZero	Wireling Adapter TinyShield
*TinyScreen+	Wireling Adapter TinyShield
WirelingZero	N/A
*RobotZero	N/A
Arduino	Wireling Arduino Shield
Raspberry Pi	Wireling Pi Hat

* These processors have a 32-pin connector and can have multiple Wireling Adapter TinyShields stacked to increase the number of Wireling ports up to a maximum of 32 total Wireling ports.

In order to interface with Wirelings, you'll need the appropriate number of Wireling Cables and the Wireling.h Library (You can download this from GitHub as linked, or from the Library Manager in the Arduino IDE).

You will also need the Microphone Wireling and the included example Arduino sketch.

	Wireling	Code
Port 0	Microphone Wireling	Example Sketch

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Hardware Assembly

Depending on the development system you choose, you will need to put together a TinyDuino stack using the 32-pin tan connectors, or you will just need to plug in your Wireling to Port 0 using a Wireling Cable. (You can change this port in the included Arduino Sketch using the Wireling.selectPort() function)

NOTE: Be mindful when inserting Wireling Cables - the connector pins inside the 5-pin connectors on Wirelings can be bent when cables are inserted at an angle.

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Software

Make the correct Tools selections for your development board. If unsure, you can double check the Help page that mentions the Tools selections needed for any TinyCircuits processor.

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Upload Program

If you would like to use a different Wireling Port, simply change the value of micPin in the code and plug the Wireling into the corresponding port on the adapter. Note that on the Wireling Adapter TinyShield, A0 corresponds to Port 0, A1 to Port 1, and so on.

Open the Serial Monitor to see the analog value the microphone is picking up.

Code

/*
  TinyCircuits Microphone Wireling Example Sketch

  This sketch reads the analog value output by the
  microphone based on the volume of sound it receives. The
  best way to see data is via the Serial Plotter. A simple
  test can be done by speaking at a normal volume, clapping,
  or blowing gently into the microphone and looking at the
  data on screen.

  Written 15 July 2019
  By Hunter Hykes
  Modified N/A
  By N/A

  https://TinyCircuits.com
*/

#if defined (ARDUINO_ARCH_AVR)
#define SerialMonitorInterface Serial
#elif defined(ARDUINO_ARCH_SAMD)
#define SerialMonitorInterface SerialUSB
#endif

float micPin = A0; // use port 0
float value = 0.0;

void setup() {
  SerialMonitorInterface.begin(9600);
  while (!SerialMonitorInterface); // must open Serial Monitor to execute following code

  delay(100);
}

void loop() {
  value = analogRead(micPin);  // read the input pin
  SerialMonitorInterface.println(value);  // print value
  delay(1);
}

Try clapping near the microphone or blowing into it to see a reading on the Analog pin.

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Downloads

• Datasheet
• EAGLE Files
• Schematic
• Arduino Sketch

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Contact Us

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Thanks for making with us!