Arduino Calculator

In this Instructable I will show you how to make an Arduino calculator that is just as good as any other calculator (well… sort of). Even though it’s probably not practical due to it’s size, repetitive use of the equals button (due to the lack of keys), and cost (You can probably buy a calculator that does the same thing for $2), It is really fun and adds a few skills to your inventory. Let me tell you how I got started on this project. It all starts at school where the original calculator was made by my friend/teacher Gabe. If your curious how the old version looked click here. Soon enough students began to play with it and soon broke it. I was the only student who knew how to fix it so I decided I might as well try. In the process I basically took the whole thing apart and started from scratch. I also rewrote most of the code. I learned alot, spent lots of time debugging, and added many new features. In the end it was a project definitely worth doing. The good thing is that now that I figured it out you don’t have to. Let’s get started.

Arduino Calculator

Step 1: Tools and Materials

For this project we will need:

– 1/8″ MDF or other laser cuttable material such as acrylic or plywood
-Laser cutter (optional but recommended)
-Wood glue
-Male to male wires
-Many male to female wires
8 by 2 LCD screen
-Drill bits
-Disc grinder (optional)
-Switch (rocker or toggle)
-Heat shrink tubing
-Soldering iron and solder
-USB A to B cable (cable differs between arduino models)
-Computer with arduino IDE

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9v battery power plug

-Arduino (I used a duemilanove if you don’t want to spend $30 on one search it on ebay)

Step 2: Making the case

My case was laser cut (I will attach files below in PDF format) from 1/4″ MDF but that’s because I couldn’t find any 1/8″ material. The calculator edges look weird because I used the wrong thickness of material. You may be wondering why the box fits together perfectly in the picture above and that’s because that box is a completely different cutting designed for 1/4″ material. The box doesn’t include holes for the LCD or keypad due to variety. That’s where the drill comes in. Let me just clear this up one last time USE 1/8 INCH THICK MATERIAL.

Step 3: Drilling and further assembly

Arduino Calculator schematic

Lay down the keypad and LCD screen where you want them and use a pencils to mark where the holes are. Find a drill bit that fits the correct size and make the hole. Before screwing in the keypad or LCD holes must be made for the wires to the arduino. To do this you an either modify the laser cut or drill a few holes in a row with a wide enough drill bit and then act like a manual CNC machine pushing the drill sideways toward the other holes until you connect them by routing through. Once this is done connect the wires and to the components and screw the LCD and Keypad into place. Now use the wood glue to glue all of the cut pieces together, you might want to leave the top open for maintenance (trust me don’t glue on the top until you are done). If you want to you can use a disc grinder to sand down the edges. You might notice in my laser cut I added an access hatch on the back to make the calculator accessible if broken (Got that idea so I wouldn’t have to start over again if the calculator broke).

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For more detail: Arduino Calculator

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