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51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
/*
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Analog input, analog output, serial output
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Reads an analog input pin, maps the result to a range from 0 to 255
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and uses the result to set the pulsewidth modulation (PWM) of an output pin.
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Also prints the results to the serial monitor.
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The circuit:
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* potentiometer connected to analog pin 0.
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Center pin of the potentiometer goes to the analog pin.
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side pins of the potentiometer go to +5V and ground
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* LED connected from digital pin 9 to ground
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created 29 Dec. 2008
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by Tom Igoe
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*/
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// These constants won't change. They're used to give names
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// to the pins used:
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const int analogInPin = 0; // Analog input pin that the potentiometer is attached to
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const int analogOutPin = 9; // Analog output pin that the LED is attached to
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int sensorValue = 0; // value read from the pot
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int outputValue = 0; // value output to the PWM (analog out)
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void setup() {
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// initialize serial communications at 9600 bps:
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Serial.begin(9600);
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}
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void loop() {
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// read the analog in value:
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sensorValue = analogRead(analogInPin);
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// map it to the range of the analog out:
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outputValue = map(sensorValue, 0, 1023, 0, 255);
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// change the analog out value:
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analogWrite(analogOutPin, outputValue);
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// print the results to the serial monitor:
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Serial.print("sensor = " );
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Serial.print(sensorValue);
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Serial.print("\t output = ");
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Serial.println(outputValue);
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// wait 10 milliseconds before the next loop
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// for the analog-to-digital converter to settle
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// after the last reading:
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delay(10);
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}
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