Just a simple diagram of an irrigation system.|
These valves are commonly available, and are very rugged.|
This is a common moisture/rain sensor that you connect to a PowerFlash module
and use to determine whether you need to water today.|
This is nothing more than a simple 'plunger type' switch which is pushed and released
by the action of the pressure switch on this common installation. I used just an
old switch taken from a computer keyboard.|
All you do is connect wires from the keyboard switch to a PowerFlash module.
The camera is mounted in a simple housing made from a section of 4" PVC pipe, and
a few scraps of wood.|
This is a common 'sail switch'. Connect some wires between it and a PowerFlash
module and you can monitor the on/off cycle of the air in the duct.|
This example shows a 'float switch' and a water pump. |
In my case, I've got a large pan under the A/C unit just where it tends to leak when the humidity is high.
Of course as soon as the float switch detects the water level, I turn on the little water pump.
A common ground rod with a cable which runs to all of the other ground rods.|
In the picture below you can see where all these come together.
All of the ground wires come together at the well-pump house where they
are first connected to a big copper bar called a 'mecca plate', which is then strapped to the well-head.|
Note the bright yellow connectors which allow me to quickly disconnect the pump from the powerlines and connect it to the gas-powered generator just out of sight on the bottom-left.
Instead of just covering the sensor with tape, you want to go ahead and clip the
sensor out and solder a pair of wires which lead to the external switch.|
The pictures below show how I've attached a 'magnetic reed switch' to the door frame.
Obviously you'll want to hide them better...
|You can also hack the DM10 in the same way...|
Here we use a very old toy called a 'drinking bird' or DoDo. When exposed to strong
sunlight, it will tip forward and rock for a bit, and will continue as long
as the sunlight does.|
By placing a MS13 or a 'hacked' MS12 next to the dodo, it will signal to your system that the sunlight is strong and hot.
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Copyright 2007, Sand Hill Engineering All rights reserved.
Last modified: April 28, 2002
Michael Ferguson, email@example.com