Instructables

Hacked Calculator Prank

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Picture of Hacked Calculator Prank
Hack a calculator to make crazy sounds or say wacky things just for fun.


 
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Step 1: What You Need...

Picture of What You Need...
1. A calculator
2. A device that uses a recording module. In my case I found a cheap automotive memo thingy that sticks to the windshield and allows you to record up to 5 different messages and play them all back. You could use a regular single sound module like one from Radio Shack.

NOTE: You will have to find a calculator that is thick eoungh to hold the module inside it's case.

Step 2: Prepare the Recording Module

Picture of Prepare the Recording Module
Before you do anything else, record what you want the calculator to "say" on the module. I actually ran a jumper from the microphone input to a mini plug that plugged into my audio card on my PC and then I recorded some .wav sound effects.

Then disassemble the device to get to the recording module. You can clip the microphone connections or leave them depending on how much room you have inside the calculator.

Step 3: Prepare the Calculator

Picture of Prepare the Calculator
Take apart the calculator and decide what key you want the sounds to play from. I chose the EQUAL sign key because that always has to be pressed. You could choose a number key that would play the sounds only when that number was pressed or the minus key...your choice.

Step 4: Make Your Connections

Picture of Make Your Connections
Run two small wires from each side of the contact on the calculator key you decide to use. Then run those two wires to the playback contacts on the module. Run the two power wires from the module to the positive and negative ends of the calculator battery terminal. When the calculator key is pressed, it will complete the circuit for that key and also the playback button.

Step 5: Close it up

Picture of Close it up
Close up the calculator and make sure no wires are sticking out. Re-insert the battery and your calculator prank is ready to use! Each time the "=" sign is pressed, the module will playback the 5 recorded sounds and then repeat. Have fun!
coolsista91 month ago
Hahahahah!
chalky5 years ago
this would be cool if you adapted it to fit inside the TV remote lol:)
Hoboman chalky5 years ago
Think this is big enough?
RCA_Lyra_1GB_MP3_Player_with_FM_Transmitter_2YM-detail.jpg
Holy **** it is big to fit a pcb like that
Holy **** it is big to fit a pcb like that
no it needes to be way bigger
i had one, but i lost it...
im a proud owner of one
me too
Lol man dont laugh at these my Grandma has one and its badass.
Yeah
I swear, I have two. And yes, they are "badass"
dombeef Hoboman4 years ago
I used to own one!But it broke :-(!!!
I found one of those giant remotes at Canadian Tire!
thats a television remote silly
chalky Hoboman5 years ago
WOW! you could fit the darn tv set into that S.O.A,B lol
thats a good idea...
awang8 chalky5 years ago
Hmm... I might work on that.
Emsaid2 years ago
just made one of these, but i used a circuit from a toy duck...I was able to fit everything in without any bulges just fine, it was awesome! I put it in one of the calculators you can borrow at my school right before the final exam, haha the teacher handed it to one of my friends and she turned it on and it started quacking and wouldnt stop! today the teacher was talking about it "somebody wired a speaker in there! very clever" she still doesnt know it was me haha Great hack!!
its a quackulator
Taost4 years ago
Now all you need is a hack that makes any answer "666". That's so gonna make your friend freak out!
lol thats awesome
HA HA HA HA! loveit!
Squid Tamer5 years ago
Genius! I wonder what else fits inside a calculator?
C4, I mean nothing, nothing at all....... :D
The problem is C4 is a high explosive which need detonators. I guess if it was a graphing calculater you could fit a detonator inside.
You can detonate C4 by lighting it on fire, then smashing it (or just stomping it)!
Actually, fire and sudden impact has slight to no effect on C4. C4 stands for Class 4 Explosive. The only way to "detonate" it sufficiently to go "boom" is to run an electrical charge through it. Sorry to be the buzzkill, but just I just like to share my knowledge. (Wikipedia it, they have some interesting articles!)
wait, i just read [http://en.wikipedia.org/wiki/C-4_(explosive) wiki]

Because C-4 burns slowly when it is ignited with a flame rather than detonated with a primary explosive, soldiers during the Vietnam War era would sometimes use small amounts of C-4 as fuel for heating rations while on long patrols. While many soldiers used C-4 safely in this manner, there are several anecdotes about soldiers attempting to put out the fire by stomping on it — causing it to detonate.

not to be mean or anything but, did you miss that part?
Must've forgotten. Well, still, an electrical charge is necessary for a timely and "neat" detonation.
any idea how much charge is needed?
hmm.... you could have a coil of wire ignite the C4, then you'll need to apply pressure, maybe have a 9mm round hit the burning C4
Kipkay (author)  Sandisk1duo5 years ago
Wow have the comments gone off "target"
Sorry for junking up your 'ible Kipkay. Probobly my fault.
Kipkay (author)  PKTraceur5 years ago
No biggie..I just thought it was funny that this turned into some kind of bomb prank. Believe me...I had much crazier ideas about how this one could go 'boom'
geeklord Kipkay5 years ago
If this makes any sense, What is the explosive(non-nuclear) with the best size to blast ratio?
I think its francium but its really really rare (second rarest element in the world)
cool
would be nice too, with a high voltage charge, ignite a small firework and blow it off :P
chalky Kipkay5 years ago
you mean "worryingly" off target Kip lol
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