Basisinfo
Mikrofontype: Elektretmikrofon (engelsk wikipedia har mer info enn norsk).
Mikrofonene dere har fått utdelt er basert på LM393 operasjonsforsterker chipset.
Driftspenning: 4-6V
Kontrollerbar sensitivitet.
Eksempel
Finnes også på GitHub.
Dette eksempelet viser hvordan du kan slå av og på et lys ved bruk av mikrofonen.
Oppkobling
Breadboard oppkobling og skjematisk oppkobling.
Kode
...
| language | cpp |
|---|---|
| title | Microphone On/Off Example |
| linenumbers | true |
/*
...
Microphone Light On/Off Example...
...
This is an example that show how a light can be turned on and off by a high sound.
...
The light stays in its state unil a new high sound arrives.
...
...
Circuit...
- Electret microphone...
- 220 ohm resistor
...
- LED
...
...
Created by Inge Edward Halsaunet, 2015...
Released into the public domain...
*/...
const int micIn = 2; // Digital pin the microphone is connected to
...
const int ledOut = 3; // Digital pin the led is connected to...
int previousSensorReading = 0; // Remember the previous reading of our microphone...
int state = LOW; // Current led state (HIGH or LOW)
...
void setup() {...
// Start serial communication with console...
Serial.begin(9600);
...
// Initialize inputs and outputs
...
pinMode(micIn, INPUT);
...
pinMode(ledOut, OUTPUT);...
}...
...
void loop() {
...
// Read the current microphone level...
int sensorRead = digitalRead(micIn);...
// See if reading has changed since last time
...
if (previousSensorReading != sensorRead) {
...
// Remember to update previous reading
...
previousSensorReading = sensorRead;...
Serial.print("Changed, now: ");...
...
// When senosor is in high state, only notify user.
...
if (sensorRead == HIGH) {
...
Serial.println("High");...
} else {...
// When sensor changes to low state, we change the state of our output light.
...
// This prevents the light from just giva a short flash, but instead remain on or off.
...
Serial.println("Low");
...
if (state == HIGH) {...
state = LOW;...
} else {
...
state = HIGH;
...
}
...
}...
}...
// Update output light value
...
digitalWrite(ledOut, state);
...
// Short delay to ensure sensor stability
...
delay(1);...
}