from machine import I2C, Pin, Timer
from ssd1306 import SSD1306_I2C

i2c = I2C(sda=Pin(23), scl=Pin(19))
oled = SSD1306_I2C(128, 64, i2c, addr=0x3c)

sig = Pin(18, Pin.IN)
led = Pin(2, Pin.OUT, Pin.PULL_UP)

def irq(pin):
    oled.fill(0)
    oled.text('Human', 0, 0)
    # 如果信号引脚为高电平说明检测到人，点亮LED，显示信息
    if sig.value()==1:
        led.on()
        oled.text('Somebody Here', 0, 32)  
    # 信号引脚为低电平说明未检测到人，熄灭LED，显示信息
    else:
        led.off()
        oled.text('Nobody Here', 0, 32) 
    oled.show()

# 初始化显示
irq(None)

# 上下边沿都触发，回调方法中判断是人进入检测范围还是离开检测范围
sig.irq(irq, Pin.IRQ_RISING|Pin.IRQ_FALLING)