neingeist
/
arduinisten
Archived
1
0
Fork 0
You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
This repo is archived. You can view files and clone it, but cannot push or open issues/pull-requests.

61 lines
1.6 KiB
Plaintext

/*
LED bar graph
Turns on a series of LEDs based on the value of an analog sensor.
This is a simple way to make a bar graph display. Though this graph
uses 10 LEDs, you can use any number by changing the LED count
and the pins in the array.
This method can be used to control any series of digital outputs that
depends on an analog input.
The circuit:
* LEDs from pins 2 through 11 to ground
14 years ago
created 4 Sep 2010
by Tom Igoe
14 years ago
This example code is in the public domain.
http://www.arduino.cc/en/Tutorial/BarGraph
*/
// these constants won't change:
14 years ago
const int analogPin = A0; // the pin that the potentiometer is attached to
const int ledCount = 10; // the number of LEDs in the bar graph
int ledPins[] = {
2, 3, 4, 5, 6, 7,8,9,10,11 }; // an array of pin numbers to which LEDs are attached
void setup() {
// loop over the pin array and set them all to output:
for (int thisLed = 0; thisLed < ledCount; thisLed++) {
pinMode(ledPins[thisLed], OUTPUT);
}
}
void loop() {
// read the potentiometer:
int sensorReading = analogRead(analogPin);
// map the result to a range from 0 to the number of LEDs:
int ledLevel = map(sensorReading, 0, 1023, 0, ledCount);
// loop over the LED array:
for (int thisLed = 0; thisLed < ledCount; thisLed++) {
// if the array element's index is less than ledLevel,
// turn the pin for this element on:
if (thisLed < ledLevel) {
digitalWrite(ledPins[thisLed], HIGH);
}
// turn off all pins higher than the ledLevel:
else {
digitalWrite(ledPins[thisLed], LOW);
}
}
}