作者：sonatasss

前言

可能是个人焊接问题ESP32C3 adc功能没有测试成功

所以没有集成燃气传感器，换成了温湿度

所用传感器

温湿度：DHT22

CO2:SenseAir S8

PM2.5+甲醛:攀藤 PMS5003S

燃气：MQ-7 一氧化碳

压电式蜂鸣器

所用开发板

合宙esp32c3

ESP-WROOM-32E

代码示例

esp32c3（PM2.5、CO2、甲醛、温湿度）

https://gitee.com/sonata1/esphome/blob/master/空气质量传感器/ecp32c3.yaml

esp32 wroom（PM2.5、CO2、甲醛、燃气）

https://gitee.com/sonata1/esphome/blob/master/空气质量传感器/ecp32wroom.yaml

所用字体

https://gitee.com/sonata1/esphome/raw/master/墨水屏/WenQuanDengKuanWeiMiHei-1.ttf

个人觉得没有必要集成温湿度传感器

温湿度功耗很低，电池供电即可，而且米家等其他现有方案也很便宜

另外DHT22不好用，建议换I2C协议的SHT30

 接线

攀藤pms5003s集成了pm和甲醛传感器

如图我们只需要 1、2、4、5针脚即可

准备4根母头杜邦线，分别和这4根线接一起就可以了

注意漏出的电线做下绝缘，没有热缩管随便拿贴纸粘下 

代码部分我设置4分钟读取一次

风扇会自动休眠210秒，工作30秒读取数值

大家可以修改成合适的间隔时间

co2传感器之前讲过

温湿度

DHT红线和绿线之间要加个电阻，4到10K都可以

这里注意合宙的墨水屏，默认gpio11不能用的

所以要busy要接在gpio5上

如果接线和我一样，那示例代码直接可以用了

ESP WROOM-E32

这个供电端口不够要用面包板了

接线参考eps32c3

这里讲下燃气传感器

可以看到AO输出是模拟输出

其实我们也不是特别关心具体数值

只要别超过危险阈值就行

所以直接读电压或者做个除法显示大概数值都可以

这里我选择gpio35连接传感器AO针脚读取电压

做出趋势图显示在墨水屏

然后做了一个超过0.3v报警的判断

判断代码如下

蜂鸣器正极接在gpio13上

注意要选压电式蜂鸣器，所需电流小

做好后用酒精湿巾放在传感器旁测试一下

测试成功 

总结

本期依然没有什么新内容

只学一个ADC电压采集

算是之前学习内容的一个组合

就不上视频了

pms5003s的内置甲醛传感器也是达特电化学传感器

所以也是有使用寿命，一般2-3年左右就该更换了

如果不想用5003s也可以选7003配单独甲醛传感器

另外，性价比上肯定遗产M1更高

不过M1上的传感器差不多也到寿命该换掉了

还是自己DIY一个比较方便

大家可以改动参数修改成适合自己的

传感器部分基本告一段落了

下期开始学别的东西    

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