旋转编码开关模块

概述

旋转编码开关又称小型旋转编码器，是指具有一组有规律且严格时序脉冲的开关电子元器件。

产品实拍

产品参数

• 工作电压：3.3V~5V
• 接口类型：ph2.0 5P
• 尺寸：24mm*40mm

引脚说明

序号	名称	功能描述
1	VCC	3V3~5V电源正极
2	GND	电源负极
3	D	按钮开关的输出（低电平有效）,当按下旋钮时，电压变低
4	A	用于确定旋转量的主要输出脉冲
5	B	用于确定旋转方向

硬件连接

旋转编码开关	UNO主控板
G	GND
V	5V
A	2
B	3
D	4

示例代码

Arduino

// Rotary Encoder Inputs
#define CLK 2
#define DT 3
#define SW 4
 
int counter = 0;
int currentStateCLK;
int lastStateCLK;
String currentDir ="";
unsigned long lastButtonPress = 0;
 
void setup() {
        
	// Set encoder pins as inputs
	pinMode(CLK,INPUT);
	pinMode(DT,INPUT);
	pinMode(SW, INPUT_PULLUP);
 
	// Setup Serial Monitor
	Serial.begin(9600);
 
	// Read the initial state of CLK
	lastStateCLK = digitalRead(CLK);
}
 
void loop() {
        
	// Read the current state of CLK
	currentStateCLK = digitalRead(CLK);
 
	// If last and current state of CLK are different, then pulse occurred
	// React to only 1 state change to avoid double count
	if (currentStateCLK != lastStateCLK  && currentStateCLK == 1){
 
		// If the DT state is different than the CLK state then
		// the encoder is rotating CCW so decrement
		if (digitalRead(DT) != currentStateCLK) {
			counter --;
			currentDir ="CCW";
		} else {
			// Encoder is rotating CW so increment
			counter ++;
			currentDir ="CW";
		}
 
		Serial.print("Direction: ");
		Serial.print(currentDir);
		Serial.print(" | Counter: ");
		Serial.println(counter);
	}
 
	// Remember last CLK state
	lastStateCLK = currentStateCLK;
 
	// Read the button state
	int btnState = digitalRead(SW);
 
	//If we detect LOW signal, button is pressed
	if (btnState == LOW) {
		//if 50ms have passed since last LOW pulse, it means that the
		//button has been pressed, released and pressed again
		if (millis() - lastButtonPress > 50) {
			Serial.println("Button pressed!");
		}
 
		// Remember last button press event
		lastButtonPress = millis();
	}
 
	// Put in a slight delay to help debounce the reading
	delay(1);
}

结果

打开串口监视器，会看到类似以下图片的输出，每当旋钮旋转一档时，变量就会有变化，顺时针旋转数值减小，逆时针旋转数值增大；按下时，会返回Button pressed!

疑难解答

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购买链接

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