17. 粉尘传感器

测量 PM2.5

17.1. 应用编程接口说明

'''
 导入 dust_sensor 模块
'''
from openaie import dust_sensor

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

'''
 方法：读取测量值
'''
dust_sensor.read()

17.2. 案例

1. 空气质量指数检测

import time
import lcd
from openaie import *


sensor = dust_sensor(1) # 粉尘传感器 -- 端口1
m = motor_fan(7)         # 电机风扇 -- 端口7
m.set(0)

# AQI(空气质量指数)等级划分 0~50~100~150~200~300~500
aqi_index = (0, 50, 100, 150, 200, 300, 500)
aqi_color = ((0,255,0), (227,207,0), (255,128,0), (255,0,0), (135,38,87), (128,42,42))
aqi_label = ("优", "良", "轻度污染", "中度污染", "重度污染", "严重污染")

# 绘制初始界面
lcd.rotation(0)
lcd.clear(color=(0,0,0))
lcd.draw_string(72, 5, "空气质量检测", fc=(0,0,255), bc=(0,0,0))
for i in range(6):
    lcd.draw_string(160, i*40+50, str(aqi_index[i]), fc=(0,0,255), bc=(0,0,0))
    lcd.draw_rectangle(190, i*40+50, 40, 40, color=aqi_color[i], thickness=1, fill=True)

# 设置空气净化器开关阈值
threshold = aqi_index[2]
while True:
    # 读取 PM2.5 测量值
    pm2_5 = sensor.read()

    # 根据 PM2.5 数值判断是否开启空气净化器
    if pm2_5 > threshold:
        m.set(80)
        lcd.draw_string(10, 110, "空气净化器:开启", fc=(0,0,255), bc=(0,0,0))
    else:
        m.set(0)
        lcd.draw_string(10, 110, "空气净化器:关闭", fc=(0,0,255), bc=(0,0,0))

    # 显示 PM2.5 测量值
    for i in range(6):
        if pm2_5 > aqi_index[i] and pm2_5 < aqi_index[i+1]:
            lcd.draw_string(10, 50, "PM2.5: %d PPM "%pm2_5, fc=aqi_color[i], bc=(0,0,0))
            lcd.draw_string(10, 70, "空气质量:" + aqi_label[i], fc=aqi_color[i], bc=(0,0,0))

    lcd.display()

    time.sleep_ms(1000)