Arduino Motor Shield Tutorial

Arduino Motor Shield on a small robot

Arduino Motor Shield on a small robot

I recently picked up an Arduino Motor Shield R3 recently and found there wasn’t a whole lot of example code on the official Arduino website for it. After some tinkering around I decided to post some example code and a Arduino motor shield tutorial. I am going to break this down into sections: overview, setup, braking, direction, speed, and current sensing. Please keep in mind that this is for the Arduino Motor Shield R3 if you are using a different shield this information won’t be relevant.
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Mesh Analysis Practice Problem

Here is a Mesh Analysis Practice Problem to practice basic mesh analysis and circuit analysis skills. This is a fairly basic problems without super-meshes. These are the types of problems you could find in the beginning of a Circuit Analysis 1 type of class. Typically around chapter 2 or 3 of your textbook.

Mesh Analysis Practice Problem Number 1

Mesh Analysis Practice Problem Number 1

There are several questions that could be asked for this problem.
Solve these questions using mesh analysis:

  1. What is the voltage across R2?

Continue reading to see a step by step solution on how to solve this question!
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Ti-36x Pro Review

Ti-36x Pro ReviewI had to purchase a scientific calculator for one of my classes so after some browsing online I decided to purchase the Ti-36x Pro and I was not disappointed.  After using this calculator for a semester at college I decided post a Ti-36x Pro review.   The Ti-36x Pro is packed with tons of features, such as the ability to solve simultaneous equations, evaluate definite integrals and a quadratic equation solver, just to name a few.

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Magpul Field Case for Iphone 5 Review

Magpul field case for iphone 5
I am very picky about cell phone cases.  On my Iphone 5 I have easily have tried or broken a dozen different cases.  (Otterboxes, Lifeproof Cases, Bumper Cases, and Snap Cases).  I am always looking for a slim case that will hold up and protect my phone from small drops.  I saw the Magpul Iphone 4 cases on amazon a few months back with extremely positive reviews.  I was browsing  amazon about two weeks ago and saw that they had finally release a case for the Iphone 5.  The new Magpul Field Case was priced extreamly well for such a highly review cases.  I decided it was worth the risk and pulled the trigger and ordered a Black Magpul Field Case.

As soon as I opened the package of the Magpul Field Case I knew it was something different.
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Nite Ize Microlock S-Biner Review

Nite Ize Microlock size comparison

I use a metal Nite Ize Key Rack for my daily key carrying needs. After reading some of the amazon review of the keychain I saw several people had a few issues with keys becoming un-clipped and falling off. Although after about a month of use with the Key Rack, un-clipping has never happened to me. I figured it would rather be safe than sorry, so I decided to pick up a pair of the Nite Ize S-Biner Micro Locks.

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Maglite Solitaire LED Review

Maglite Solitaire LED Review

Recently I have been looking for a good flashlight to add to my key-chain. A lot of people online recommend the Streamlight Nano Light , but due to it requiring coin cell batteries I decided to look for another option that uses standard batteries. In my searching I came upon the MAGLITE Solitaire and the Maglite Solitaire Led. I have always have been happy with maglite products so I decided to give the brighter Maglite Solitaire Led. I ordered it offline and a few days later it arrived.

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What are the holes in plugs for?

What are the holes in plugs for
So today, I was around the house and picked up a electrical plug and realized I had no idea what the holes on the prongs were for. I decided to research what the holes are for and I figured I would share my findings. So what are the holes in plugs for?

Looking around what I had around my house I was hard-pressed to find anything electrical plug that didn’t have the holes in it. Out of all my cables I could only find 1 plug that didn’t have the holes on it. This was on a device that was mail-ordered from China. The holes in the electical plug measured approximately 1/8″ (I found the holes were typically about 0.005″ undersized) in diameter located about 0.22″ from the end of each prong. So enough technical details; What are the holes in plugs for?

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A Look at a 808 Micro Camera

The top of the 808 Micro Camera Circuit Board 808 Micro Camera

A year or so back I picked up a what is know as a “808 Micro Camera”. These small cameras are available all over the internet for a range of prices, different specifications, and different components. I picked mine up at my local hobby store for <$15. After searching online I discovered that that there are tons and tons of different 808 micro cameras. I came across this website that had a ton of information on them and the different types of cameras. Looking at that site it appears that mine would be considered a #9.

808 Micro Camera 808 Micro Camera808 Micro Camera

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Where to buy powerful lasers?

Powerful green laser pointer  buy lasers online
So you want to buy a powerfully laser? Okay, there are ton and tons of places that sell them, some of them legitimate and some of them that are not.  But before you go out and spend your hard earned money buying there are some things you should know before you buy lasers online.

  • Powerful lasers (>5mW) can potentially be dangerous. Be sure to read up on laser safety and get yourself a set of laser goggles that are appropriate for your laser.
  • Often times you get what you pay for. For example expect a $300 laser to be built to higher quality standards than a $15 laser from ebay. Characteristic such as life span, ir leakage, power, and stability can all drastically change from a $300 laser to a $15 laser.
  • Sadly it may be illegal for buy a powerful laser. In United States limits the max power of a laser pointer to 5mW.  In European Union and Australia limits the max power of a laser pointer to 1mW. Importing anything with greater into other countries may get your laser confiscated. I’m am sure there are other limitations for other counties as well.
  • Can’t I just pot mod my laser to make it more powerful? No.

Okay thats all great, but where do I buy lasers from?  Continuing reading to find out! 

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