15. 人体热释电传感器

15.1. 应用编程接口说明

'''
 导入 pir_sensor 模块
'''
from openaie import pir_sensor

'''
 类：pir_sensor
 参数:
    port: 端口号 -- 1或7
'''
class pir_sensor(port)

'''
 方法：检测
 @return：检测到有人移动返回 True
'''
pir_sensor.detect()

15.2. 案例

1. 人体感应灯

from openaie import rgb_led, pir_sensor
import time
import lcd


pir_sensor = pir_sensor(2) # 人体热释电传感器 -- 端口2
rgb = rgb_led(7)           # 全彩LED -- 端口6

deadline = 0
delay_time = 3000 # 单次触发延时时间 3000ms
light_on = False

# 绘制初始界面
lcd.rotation(0)
lcd.clear(color=0)
lcd.draw_string(76, 5, "自动感应灯", fc=(0,0,255), bc=0)
lcd.display()

while True:
    if pir_sensor.detect(): # 检测到有人
        deadline = time.ticks_add(time.ticks_ms(), delay_time) # 重新计算截止时间
        if not light_on:
            for i in range(3):
                rgb.set(i, (50,50,50))
            rgb.display()
            light_on = True
            lcd.draw_string(10, 50, "检测到有人", fc=(0,255,0), bc=0)
            lcd.draw_string(10, 90, "照明设备:开启", fc=(0,0,255), bc=0)
            lcd.display()
            print("turn on the light")

    if light_on:
        print("now: ", time.ticks_ms())
        if time.ticks_diff(time.ticks_ms(), deadline) > 0: # 判断是否超时，超时自动关闭照明
            for i in range(3):
                rgb.set(i, (0,0,0))
            rgb.display()
            light_on = False
            lcd.draw_string(10, 50, "没有检测到", fc=(255,0,0), bc=0)
            lcd.draw_string(10, 90, "照明设备:关闭", fc=(0,0,255), bc=0)
            lcd.display()
            print("turn off the light")

    time.sleep_ms(100)