/*
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
created 4 Sep 2010
by Tom Igoe
This example code is in the public domain.
http://www.arduino.cc/en/Tutorial/BarGraph
*/
// these constants won't change:
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);
}
}
}
2020年2月1日 星期六
訂閱:
張貼留言 (Atom)
algorithm
#include <iostream> #include <string.h> using namespace std; int main(int argc, char** argv) { for(int j=2;j<=100;j++)//j...
-
本文旨在補充《 超圖解Arduino互動設計入門 》第18章「RFID無線識別裝置與問答遊戲製作」單元,書本採用的RFID讀卡機模組是採用9600bps, TTL序列通訊介面,RFID的通訊頻率為125KHz。這種模組的接線和程式都很簡單,每當感測到RFID卡,讀卡機就把...
-
3.Keil C 幫我們寫好 程式:#include <reg51.h> vs c語言 #include <stdio.h> //幫您宣告 P0=0x80 有相對的記憶體以十六進位表示,它定義定reg51.h,我們直接拿來用他的代碼即可 P1=0...
-
當PC主機對裝置發出控制信號時,所有連接的裝置都透過根集線器收到同樣的信號,但是經由比對所配置的裝置位址後,只能有一個裝置會作出相對應的動 作,這跟網路的架構有點類似。因此對一個裝置而言,不僅要無誤地接收主機端所送來的資料,又要正確地發出回應的信號。因此在D+與D-的差動資料線上...
沒有留言:
張貼留言