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PURPOSE:

Create a safe tool for the Arduino that will serve as a high voltage testing tool.
 
PRIORITIES:
1.  Safety for anyone wanting to re-create this project
2.  Full set of instructions so the project can be re-created by anyone following the instructable.
3.  A tool that allows maximum flexibility and configured to the users' needs safely.
4.  Components of the tool can easily be replaced, should failure in components occur.


PROJECT FUNCTIONALITY:
2 outlets that operate independent of each other

Each outlet can be configured as NO (normally open) or NC (normally closed) depending on need.
 
Tool can be used to test code by the Arduino without having to use high voltage connections

STATES -
NC (normally closed) outlets controlled with independent switches and can only be "HOT" when Arduino PIN is "HIGH"

NO (normally open) outlets controlled with independent switches in this mode the Arduino will stop power to the outlets when the Arduino PINS go "HIGH".  You will need to play with this in order to understand it's function.

Step 1: SAFETY - Working With High Voltage (110 Volts)

CORRECT PRECAUTIONS are needed as you are working with electrical lines rated at 110 volts.  This level of voltage can harm you and is possible to cause death in some cases.  You should always seek help from a certified electrician should you choose to re-create this project.  

ADDED SAFETY STEPS:
Never work with the relay, outlet or power cord if connected to a live electircal power source.
Enclose all wires before any testing of the project.
If in question as to safety  --   JUST UNPLUG IT.
This tool can only handle approximately 1000W (power=current X voltage) per outlet to be safe.
This project can be done safely if you are careful and understand the risk involed.
Only plug this tool into a GFCI (Ground Fault Circuit Interrupter) outlet, this one precaution could save your life.




ADDITIONAL INFORMATION:

This project is building on work done by Luke Liseman and his "Garduino" design
https://www.instructables.com/id/Garduino_Gardening_Arduino/

 

Sparkfun has a guide that should be reviewed also.
http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=119


I think evix means that 110 isn't anywhere near high voltage, it's only low voltage.<br><br>Still lethal, but not classified as high voltage.
<p>your tutorial is very well laid out and great source as well.but would a wiring diagram be better to follow?another question,there are already 5V arduino relay board available in the market.what was the diffirence between yours and others.</p>
Kallan - good point - thanks for your interest in this project.<br><br>rik
<br /> 110, high volt?<br />
I only use it for 110 as I am located in the US.&nbsp; For higher voltage the spec's on the relay - I think state it would be 5 amps at 220.&nbsp;&nbsp; You need to review the spec's yourself to make that determination.<br />

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