Microphone

This condenser microphone from Watterott Electronics is equipped with an amplifier and can detect noises between 58 and 110 dB. It outputs the measured noises in a range of 0-5V.

Condenser Microphone in the senseBox:edu

Technical Information

• Dimensions: 30mm x 11mm x 7.5mm
• Operating voltage: 2.7 - 5.5V DC
• Detection of sounds between 58 and 110 dB

Aufbau für das Kondesatormikrofon

Programming (Arduino)

Code

This code outputs the measured voltage value to the Serial Monitor.

 /*
 * This code has been adapted from the
 * Example Sound Level Sketch for the Adafruit Microphone Amplifier
 */

unsigned int micValue; // Variable to store the current measurement value
int micPort = 1;
const int recordingTimeWindow = 100; // Duration of the measurement interval in ms (100 ms = 10Hz)

void setup() {
	Serial.begin(9600); // Starts the Serial Monitor
}

void loop()
{
	unsigned long start = millis();  // Start of the measurement interval
	unsigned int peakToPeak = 0;   // Distance from maximum to minimum amplitude swing
	unsigned int signalMax = 0;
	unsigned int signalMin = 1024;

	// Collect data for 100 milliseconds
	while (millis() - start < recordingTimeWindow)
	{
		micValue = analogRead(micPort); // Measure the current value
		if (micValue < 1024)  // filter out erroneous measurements with values above the max value of 1024
		{
			if (micValue > signalMax)
			{
				signalMax = micValue;  // store the maximum measured value
			}
		else if (micValue < signalMin)
			{
				signalMin = micValue;  // store the minimum measured value
			}
		}
	}
	peakToPeak = signalMax - signalMin;  // max - min = distance from maximum to minimum amplitude swing
	double volts = (peakToPeak * 5.0) / 1024;  // convert to volts


	Serial.print(volts);
	Serial.println(" Volts");
}

Programming (Blockly)

In Blockly the sensor can be read using the following block:

Choose the port to which you have connected the sensor via the dropdown menu.