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我正在製作一個立體聲控制器，並有一個帶按鈕的旋轉編碼器。當我按下按鈕時，它會循環顯示選項，旋轉編碼器可以讓我設置強度。當我來回切換時，我希望個人強度保持不變。當我將低音轉爲50％，然後將音量設置爲80％時，我想返回，基本仍然是50％。我遇到的問題是強度正在轉移。（Arduino）與案例計數
對於原型，我使用3個LED。我可以設置單獨的亮度，但是當我去改變下一個LED時，它會自動改變爲之前LED的亮度。
這背後的原因是，當我設置低音和高音以及音量時，我不希望當我回來改變某些東西時，這些值會跳躍。我想挑選它離開的地方。
我認爲我要去的結構是一個基於案例的計數器。如果可能的話，外部的一個公共變量由旋轉編碼器增加，然後存儲。
/*
** Rotary Encoder Example
** Use the Sparkfun Rotary Encoder to vary brightness of LED
**
** Sample the encoder at 200Hz using the millis() function
*/
int brightness = 0; // how bright the LED is, start at half brightness
int fadeAmount = 30; // how many points to fade the LED by
unsigned long currentTime;
unsigned long loopTime;
const int pin_A = 4; // pin 12
const int pin_B = 5; // pin 11
unsigned char encoder_A;
unsigned char encoder_B;
unsigned char encoder_A_prev=0;
const int green = 11;
const int blue = 10;
const int red=9;
int last_bright=0;
int mode = 0; // Selector State (Initial state = ALL OFF)
int val = 0; // Pin 13 HIGH/LOW Status
int butState = 0; // Last Button State
int modeState = 0;
int selected=710;
int greenvol=0;
int redvol=0;
int bluevol=0;
int select_bright=0;
void setup() {
// declare pin 9 to be an output:
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
pinMode(pin_A, INPUT);
pinMode(pin_B, INPUT);
currentTime = millis();
loopTime = currentTime;
}
void loop() {
// get the current elapsed time
currentTime = millis();
brightness=select_bright;
if(currentTime >= (loopTime + 5)){
// 5ms since last check of encoder = 200Hz
encoder_A = digitalRead(pin_A); // Read encoder pins
encoder_B = digitalRead(pin_B);
if((!encoder_A) && (encoder_A_prev)){
// A has gone from high to low
if(encoder_B) {
// B is high so clockwise
// increase the brightness, dont go over 255
if(brightness + fadeAmount <= 255) brightness += fadeAmount;
}
else {
// B is low so counter-clockwise
// decrease the brightness, dont go below 0
if(brightness - fadeAmount >= 0) brightness -= fadeAmount;
}
}
encoder_A_prev = encoder_A; // Store value of A for next time
// set the brightness of pin 9:
analogWrite(selected, brightness);
last_bright=brightness;
loopTime = currentTime; // Updates loopTime
}
// end of rotary encoder
val = digitalRead(8);
delay(5);
// If we see a change in button state, increment mode value
if (val != butState && val == HIGH){
mode++;
}
butState = val; // Keep track of most recent button state
// No need to keep setting pins *every* loop
if (modeState != mode)
// If no keys have been pressed yet don't execute
// the switch code below
{
switch (mode) {
case 2:
selected=red;
select_bright=redvol;
redvol=last_bright;
break;
case 3:
selected=green;
select_bright=greenvol;
greenvol = last_bright;
break;
default:
selected=blue;
select_bright=bluevol;
bluevol = last_bright;
mode = 1;
break;
}
}
}