Raspberry Pi Picoで学ぶロータリーエンコーダーの使い方！基本原理と実践コード

from machine import Pin
from utime import sleep
import micropython 


class Rotary:
    ROT_CW = 1
    ROT_CCW = 2
    SW_PRESS = 4
    SW_RELEASE = 8
    
    def __init__(self, dt, clk, sw):
        self.dt_pin = Pin(dt, Pin.IN)
        self.clk_pin = Pin(clk, Pin.IN)
        self.sw_pin = Pin(sw, Pin.IN)
        self.last_status = (self.dt_pin.value() << 1) | self.clk_pin.value()
        self.dt_pin.irq(handler=self.rotary_change, trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING)
        self.clk_pin.irq(handler=self.rotary_change, trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING)
        self.sw_pin.irq(handler=self.switch_detect, trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING)
        self.handlers = []
        self.last_button_status = self.sw_pin.value()
        
    def rotary_change(self, pin):
        new_status = (self.dt_pin.value() << 1) | self.clk_pin.value()
        if new_status == self.last_status:
            return
        
        transition = (self.last_status << 2) | new_status
        try:
            if transition == 0b1110:
                micropython.schedule(self.call_handlers, Rotary.ROT_CW)
            elif transition == 0b1101:
                micropython.schedule(self.call_handlers, Rotary.ROT_CCW)
            self.last_status = new_status
        except RuntimeError:
            pass
        
    def switch_detect(self, pin):
        if self.last_button_status == self.sw_pin.value():
            return
        self.last_button_status = self.sw_pin.value()
        if self.sw_pin.value():
            micropython.schedule(self.call_handlers, Rotary.SW_RELEASE)
        else:
            micropython.schedule(self.call_handlers, Rotary.SW_PRESS)
    
    def add_handler(self, handler):
        self.handlers.append(handler)
    
    def call_handlers(self, type):
        for handler in self.handlers:
            handler(type)

from rotary import Rotary
import utime as time
from machine import Pin, I2C 
from ssd1306 import SSD1306_I2C
import framebuf

WIDTH = 128
HEIGHT = 64

buffer = bytearray(b'\x00\x00\x00\x00\x01\xf0\x0f\x00\x06\x860\xb0\x04\x01@\x10\x04\x01\x000\x02\x10\x89 \x02\x05\xd2 \x01\x03\xe0@\x01\x87\xe0\x80\x10~?\x00\x00\x88\x11\x80\x01\x18\x08@\x02><@\x02a\xc3@C\xc1\x81\xe0\x05\x80\x90\x91\x08\x80\x80\x98\x08\x81\xc0\x88\t\x83\xe1\x98)\xe4\x1f\x98\x07\xf8\x0e0\x068\x0c \x02\x18\x080\x02\x88\x08 \x03\x0e0A\x01\x8f\xf8\x80\x00|\x1f\x00\x008\x0c\x00\x00\x0c0\x02\x00\x03\xe0\x00\x00\x00\x80\x00\x01\x00\x00\x04')

fb = framebuf.FrameBuffer(buffer, 32, 32, framebuf.MONO_HLSB)

i2c = I2C(0, scl=Pin(17), sda=Pin(16),freq=200000)

oled = SSD1306_I2C(WIDTH, HEIGHT, i2c)

# clear screen
oled.fill(0)
oled.blit(fb, 64, 32)
oled.show()
time.sleep(1)
oled.fill(0)
rotary = Rotary(0, 1, 2)

val = 0

def rotary_changed(change):
    global val
    if change == Rotary.ROT_CW:
        val += 10
        oled.blit(fb, val, 32)
        oled.show()
        time.sleep(0.2)
        oled.fill(0)
        print(val)
    elif change == Rotary.ROT_CCW:
        val -= 10
        oled.blit(fb, val, 32)
        oled.show()
        time.sleep(0.2)
        oled.fill(0)
        print(val)
    elif change == Rotary.SW_PRESS:
        val += 20
        oled.blit(fb, 64, val)
        oled.show()
        time.sleep(0.2)
        oled.fill(0)
    elif change == Rotary.SW_RELEASE:
        val -= 20
        oled.blit(fb, 64, val)
        oled.show()
        time.sleep(0.2)
        oled.fill(0)
        
rotary.add_handler(rotary_changed)


while True:
    time.sleep(0.1)