Measure real world things, turn a knob and move a servo on the other side of the world. This has been possible with a PC but now it is possible using inexpensive boards and low or battery power. This project uses pre-made Arduino boards and no soldering is required.

This project was inspired by this Instructable https://www.instructables.com/id/ARDUINO-ENERGY-METER/

Step 1: The Internet of Things - Smaller, Cheaper, Less Power

A standard Arduino board is now under $10. A W5100 Ethernet shield is also under $10. A LCD keypad display shield is under $6. Debugging Arduino can be done via the serial port, but for out in the field there are some advantages to having a display. Adding a display can be done in many ways, and for this project we are looking to use premade boards. There are two small catches - some pins clash with the Ethernet shield and the LCD shield, and also the display shield shorts out a few pins on the metal of the Ethernet plug, so it needs to be raised up higher.

To get a cheap board, search Arduino on ebay and sort on price+postage and “buy it now”. Then for the Ethernet board, search on Arduino Ethernet. For the display board, search Arduino LCD Keypad.

<p>Hello, Dr. James.</p><p>I like your Intstructable. It's so cool and well written.</p><p>I'm so sorry. I can't find the code uses Arduino Ethernet Shiled for Xively Connection.</p><p>Where I can show the source code?</p><p>Thank you.</p>
<p>Hello James,</p><p>I like your Instructable, simple and straight to the point. </p><p>The one thing I would recommend is NOT to break pin 10 off the LCD shield.</p><p>Bend it on the stackable header instead: cheaper solution and it saves the integrity of the shield. By bending it, you will also have the option of soldering a wire to it and attach it to an unused pin.</p><p>BTW, I also use the TP-Link solution and there is an even cheaper and more versatile solution: TL-WR703N Mini Portable Wireless Router (US $24.50) which can be easily be upgraded to OpenWRT. Just make sure you get the English Firmware or you will have to learn Chinese like I had to do when I received mine...</p>
Excellent idea - bend it rather than breaking it off. Thanks++. And thanks for the router ideas - as time goes on these seem to get cheaper and use less power. Cheers.
<p>Nice instructable - well written! Concerning the router idea - I've already used the WR703N as a wifi bridge for my Arduino projects. If you're interested - I wrote up a short tutorial how to prepare the WR703N.</p><p>http://en.code-bude.net/2013/01/29/how-to-build-a-20dollar-low-cost-openwrt-router-flash-openwrt-to-tp-link-wr703n/</p>

About This Instructable



Bio: Dr James Moxham is a general medical practitioner in Blackwood, Australia. His interests include general family medicine, medical politics, microcontrollers and tending a rose garden ... More »
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