最近研究了一下旋转编码器的使用。入手的是 ALPS EC11系列的：
为了让它工作，自己做了电路板电阻配合【参考1】。电路图和 PCB 设计如下：
工程可以在这里下载：
软件方面使用了ai-esp32-rotary-encoder 库，下面是一个同时使用2个旋转编码器的例子（特特别注意：不是任何的GPIO 都能选择成为和旋转编码器连接的引脚，某些连接之后会导致无法启动，有可能是因为部分ESP32在启动时会选做接口VSPI，如果你了解原因不妨在评论中指出。谢谢！ ）：
#include "AiEsp32RotaryEncoder.h"
#include "Arduino.h"
/*
connecting Rotary encoder
CLK (A pin) - to any microcontroler intput pin with interrupt -> in this example pin 32
DT (B pin) - to any microcontroler intput pin with interrupt -> in this example pin 21
SW (button pin) - to any microcontroler intput pin -> in this example pin 25
VCC - to microcontroler VCC (then set ROTARY_ENCODER_VCC_PIN -1) or in this example pin 25
GND - to microcontroler GND
*/
#define ROTARY_ENCODER1_A_PIN 4
#define ROTARY_ENCODER1_B_PIN 16
#define ROTARY_ENCODER1_BUTTON_PIN 2
AiEsp32RotaryEncoder rotaryEncoder1 = AiEsp32RotaryEncoder(ROTARY_ENCODER1_A_PIN, ROTARY_ENCODER1_B_PIN, ROTARY_ENCODER1_BUTTON_PIN, -1);
void rotary1_onButtonClick() {
Serial.println("Button1 Pressed!");
}
void rotary1_loop() {
//first lets handle rotary encoder button click
if (rotaryEncoder1.currentButtonState() == BUT_RELEASED) {
//we can process it here or call separate function like:
rotary1_onButtonClick();
}
//lets see if anything changed
int16_t encoderDelta = rotaryEncoder1.encoderChanged();
//for some cases we only want to know if value is increased or decreased (typically for menu items)
if (encoderDelta>0) Serial.print("+");
if (encoderDelta<0) Serial.print("-");
//for other cases we want to know what is current value. Additionally often we only want if something changed
//example: when using rotary encoder to set termostat temperature, or sound volume etc
//if value is changed compared to our last read
if (encoderDelta!=0) {
//now we need current value
int16_t encoderValue = rotaryEncoder1.readEncoder();
//process new value. Here is simple output.
Serial.print("Rot 1 value: ");
Serial.println(encoderValue);
}
}
#define ROTARY_ENCODER2_A_PIN 26
#define ROTARY_ENCODER2_B_PIN 27
#define ROTARY_ENCODER2_BUTTON_PIN 14
AiEsp32RotaryEncoder rotaryEncoder2 = AiEsp32RotaryEncoder(ROTARY_ENCODER2_A_PIN, ROTARY_ENCODER2_B_PIN, ROTARY_ENCODER2_BUTTON_PIN, -1);
void rotary2_onButtonClick() {
Serial.println("Button2 Pressed!");
}
void rotary2_loop() {
//first lets handle rotary encoder button click
if (rotaryEncoder2.currentButtonState() == BUT_RELEASED) {
//we can process it here or call separate function like:
rotary2_onButtonClick();
}
//lets see if anything changed
int16_t encoderDelta = rotaryEncoder2.encoderChanged();
//for some cases we only want to know if value is increased or decreased (typically for menu items)
if (encoderDelta>0) Serial.print("+");
if (encoderDelta<0) Serial.print("-");
//for other cases we want to know what is current value. Additionally often we only want if something changed
//example: when using rotary encoder to set termostat temperature, or sound volume etc
//if value is changed compared to our last read
if (encoderDelta!=0) {
//now we need current value
int16_t encoderValue = rotaryEncoder2.readEncoder();
//process new value. Here is simple output.
Serial.print("Rot 2 value: ");
Serial.println(encoderValue);
}
}
void setup() {
Serial.begin(115200);
Serial.println("Starttesting");
//we must initialize rorary encoder
rotaryEncoder1.begin();
rotaryEncoder1.setup([]{rotaryEncoder1.readEncoder_ISR();});
//optionally we can set boundaries and if values should cycle or not
rotaryEncoder1.setBoundaries(0, 10, true); //minValue, maxValue, cycle values (when max go to min and vice versa)
//we must initialize rorary encoder
rotaryEncoder2.begin();
rotaryEncoder2.setup([]{rotaryEncoder2.readEncoder_ISR();});
//optionally we can set boundaries and if values should cycle or not
rotaryEncoder2.setBoundaries(0, 10, true); //minValue, maxValue, cycle values (when max go to min and vice versa)
}
void loop() {
//in loop call your custom function which will process rotary encoder values
rotary1_loop();
rotary2_loop();
delay(50);
}
上述测试代码：
库可以在这里下载：
测试的照片：
参考：
1.