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February 13, 2015 AT 1:00 am

Automated mushroom cultivation with #raspberrypi #piday @Raspberry_Pi

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From Kyle Gabriel‘s website via the Raspberry Pi Pod:

In 2009 I developed my first automated cultivation chamber for growing gourmet mushrooms. It consisted of a controller that modulated a humidifier to alter the humidity level, a heater to alter the temperature, and an exhaust fan to evacuate excess carbon dioxide. At the time, I was producing some of my first practical uses of the C programming language, nearly a decade after learning the basics. This was also my first of many automation projects using the ATMega168 microcontroler, and on my first Arduino board, the Duemilanove. Although I still use ATMega MCUs today, at the time, the scope of what I wanted to do required more connectivity and processing power. Therefore, I utilized a serial connection to a computer running linux, which hosted a control interface on a web server. However, in 2012 the Raspberry Pi was released. It was the first of its kind, offering a 700 Mhz processor that could run a full distribution of Linux, 17 general purpose input/outputs (GPIOs), SD card storage, HDMI/VGA output, and USB connectivity, all for under $30. With it now being attainable to reduce the size of my control system down to the equivalent of a deck of playing cards, I tasked myself with redesigning the code to work on this new hardware.

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