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How to Measure ROOM CO2 concentration with 20$ sensor "MH-Z19" and Raspberry Pi, 2nd edition.

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MH-Z19 CO2 concentration Sensor MH-Z19  is a small, low-cost, weigh 15g CO2 sensor module product by  郑州炜盛电子科技 . You can buy it at an online shop like  eBay  or  aliexpress  about 20$. The electrical interface of this sensor is compatible with Raspberry Pi. So you can make your D.I.Y. CO2 Monitor with MH-Z19, Raspberry Pi. The normal CO2 concentration is about 400ppm. On a global scale, this value is sensitive to the effect of the activities of the plants, seasonally it gets lower in summer due to vigorous plants photosynthesis and getting higher in winter, and the long-range trend is continuing to rise linearly. The Japanese Meteorological Agency reports CO2 concentration chart continuously as hire . It indicates a clear trend of rising. On your room-scale, in a closed room with 2 people, CO2 concentration rise up to 1,200ppm soon and keep falling slowly after 1 person go out. In a high CO2 concentration room as 1200ppm, somebody can get a headache or sleepines
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Monitoring all over the world with 3G Network for not more than 10$ monthly payment

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The MONITOR™  is a free web service that shows the latest posted picture and sensor data. With  2$ USB Camera  and Raspberry Pi, you can get your D.I.Y. Monitoring for an inexpensive cost. You can get started MONITOR™ for Free  here ! Even at the place where  no available network access all over the world, your Monitoring system still works well with  3G dongle  &  International Data SIM card . I write from now on how to set up an inexpensive 3G network environment on your RaspberryPi easily. USB 3G dongle and Data SIM card utilities " gc_modem " In General, a setting of USB 3G dongle and SIM Card is troublesome works with bizarre technical terms, like udev rule, apn, and so on. The " gc_modem " is useful utilities to change there troublesome works mentioned above to just select the name of dongle and SIM card which you'll use.  gc_modem is consist of the following parts: udev_rules : Definitions of each USB 3G dongles which will be me
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How to get Time Series Chart of the room Temperature, Relative Humidity and Humidity Deficit with 3$ sensor "DHT22" and Raspberry Pi without any electronic works nor any programming.

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DHT22 (AM2302) temperature & humidity Sensor Though  DHT22 (another name AM2302) sensor is small and low-cost, but have a decent quality of precision of me asuring temp/humidity. You can buy the ready to use breakout of DHT 22 for 3 - 4$ from  eBay . Why measure the room humidity as well as temperature Not only to get comfortable air but also to measure and control humidity has a lot of purposes, for example: - In high humidity rooms like summer or monsoon season in Japan, where I live in, It often grows the mold everywhere on the wall, clothes, food and so on. The mod can't be active under low relative humidity . I'm controlling my room to keep relative humidity under 60% to block to grows the mold. The filamentous fungi , which is many of the causes of plant disease , is in the same family of mold, so a lot of plant disease also can avoid by humidity control.  - Some plant is known that they close there pore under hight Humidity Deficit (I'll e
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How to make Human Detection Security camera with under 1$ Human Detection Senser, 2$ USB Webam & Raspberry Pi

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With under 1$ Human Detection Sensor,   HC-SR501 With  2$ USB Webcam , and Raspberry Pi connected to the Internet, You can make Web Base Security Camera System as follows: PIR Sensor There are many types of Human Detection Sensor, some of these watching infrared light rays and cache shutting out of this, or some these using Millimeter-wave radar. PIR(Passive Infrared Ray) Sensor is one of these Human Detection Sensor which watches the change of thermal infrared emitted from hot objects like Humans , Birds , and Mammals . The sensor consists of a  lens for thermal infrared (white plastic tip in the picture below) and a  detector device . Both parts are inexpensive parts and a detector is low current consumption parts. So, the advantage to use the PIR sensor for Human Detection is: - Inexpensive - Low current consumption How to setup Step 1. Get account of MONITOR™ and your view_id On your Web browser, Sign up to  MONI
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