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Topic: Mushroom farm - monitoring system (Read 4385 times) previous topic - next topic


well... guess I have to get a new pump then... Thanks for the advice!

I found a project similar to mine, the guy use this board: http://viewitem.eim.ebay.pt/UNO-R3-ATMEGA328-ATMEGA16U2-Controller-Board-FOR-ARDUINOs-IDE-Compatible/290901496705/item

and this LCD:

It's a good choice? or there is a better one? I'm trying to save money but don't want something that don't last.


I find a high pressure pump :http://viewitem.eim.ebay.pt/12V-Volt-Mini-DC-Diaphragm-Water-Pump-65PSI-3Lmin-RV-pump/330893776704/item

the problem is that my misting system only can handle pressures between 220 and 280 kPa... there is some way to reduce the pump pressure?


The pump head contains a pressure switch that turns off the pump when the pressure is reached. In typical operation the pump would be always powered but the pressure switch will hold it off until a faucet or valve is opened and water starts to flow. You can make adjustments to the pressure cutoff; on your pump the adjustment appears to be performed by turning the screw on the end of the pump (clockwise for more pressure, counterclockwise for less).

Where you might run into a problem is when your flow is much less than the 3 liters/minute that the pump is designed for. This will cause the pump to cycle on and off rapidly which is a generally undesireable situation. You can remedy this to some extent by adding an "accumulator" downstream of the pump; this is a small tank, partially filled with air, that would act as a buffer between the pump and misting heads so the cycling occurs less frequently.

Another option is to drive the pump using a mosfet and PWM. Basically just reduce the current to the pump so it cannot generate as much pressure.

Do you have a link to documentation on your misting system? Just curious what you're using.


Stainless steel soil moisture sensors are available. SSM analog sensors use analogRead() to report soil moisture for appropriate ranges:  arid/dry/damp/normal/wet/saturated. http://smartgreenhouse.org/index.php/products/sensors/soil-moisture-sensor.

We also use relay boards for pump and lighting control, for both 12V LED and 240v/120v AC power.

Ventilation is also important, use relay boards for fan control and active venting.

For misting we use a 60psi FloJet pump (12v DC) with micro heads that mist a large area. These also actively cool the air so a misting system is very useful in this type of environment.

(usual disclaimer: I am associated with SmartGreenHouse.org)
Don't breath in the magic smoke!


Apr 29, 2013, 05:22 pm Last Edit: Apr 29, 2013, 05:34 pm by Jason_B Reason: 1
My name is Jason and I work in product development at CO2meter.com. I try to keep up with forums for arduino and other similar products to provide guidance to projects that involve air quality control. We have clients that run large scale mushroom growing operations, and along with Temperature and humidity, it is also important to monitor CO2 levels. This article explains a little about why: http://www.co2meter.com/collections/mushrooms-co2.

It lists a few products that we often provide for our clients, but to incorporate into an automated system I would look into the Cozir RH/T http://www.co2meter.com/collections/co2-sensors/products/cozir-0-2-co2-sensor. This provides real time CO2 level, Temperature, and humidity over UART. I have written some basic libraries to work with MCUs and getting it running on an arduino is very straightfoward.

If you have any questions or would like the code for running these please let me know.

-Jason Berger

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