Instructables

Water Powered Calculator (Original)

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This Instructable will show you how to make a very simple water powered calculator.
I built this because there was a time that we forget to buy a supply of AAA, AA, C, D and LR44
battery so I built this. It solve my problems so it might do the same for you too. Check out for more projects by: angelo10.

This is the original version by: angelo10

Please give the credits to me not for your selves. I saw people getting my pictures and telling  others that they made it. Please don't get all the credits!

Proud to be Filipino (pinoy) like Manny Pacquiao.
 
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Step 1: Meterials You Will Need

Picture of Meterials You Will Need
You will need:
- A Calculator
- Carbon Rod/ Copper Rod
- A 1x1 Inch Aluminum Foil
- A Small Cylindrical Container
- Two 3 Inch Wire
- Multi Purpose Pliers
- Glue Gun

Step 2: Making Some Holes

Picture of Making Some Holes
P1010009.JPG
Use a drill or a pointy object to make some holes located on the bottom and lower side.

Step 3: Adding The Carbon Rod (Positive)

Picture of Adding The Carbon Rod (Positive)
Glue the carbon rod  in place as the positive rod. The carbon rod is from a used AA battery.
Warning: Never open alkaline "it is messy".

Step 4: Adding The Foil (Negative)

Picture of Adding The Foil (Negative)
Glue the foil in place as the negative plate.

Step 5: Connect The Water 's Wires

Picture of Connect The Water 's Wires
Connect the wire of the water battery, and glue it so it won't leak. Positive wire connected to carbon rod while negative is connected to the foil / zinc.

Step 6: Disassembling The Calculator

Picture of Disassembling The Calculator
Disassemble the calculator with a screwdriver.

Step 7: Connect The Water Battery To The Calculator

Picture of Connect The Water Battery To The Calculator
Connect the water battery to the calculator. The carbon rod is positive while the aluminum is negative. Be sure to disconnect the solar panel.

Step 8: Assemble It Again

Picture of Assemble It Again
Put it back together again.

Step 9: Fill The Water Battery

Picture of Fill The Water Battery
Liquid Rating:
Water - Good
Water With Salt - Better
Vinegar - Best

Step 10: You Are Done

You are done. You just need to refill it a again after it run-out of power. Adding more water batteries would be better.
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Amazing!
shalo2 years ago
aside from batteries where can you find those cooper rods? pls help im so desperate :( and im from the philippines as well so if you a pls tell me:)
ASCAS (author)  shalo2 years ago
It's hard to find one, probably in construction hardwares, they usually call it copper tubing. I made another design of the water battery by only using copper wire and nails. My new version is more efficient, more powerful and uses mor common materials.
Nice job man! I am just starting to explore electronics at 15 years old, and you are an inspiration for me to keep with it!
ASCAS (author)  austinbro2172 years ago
Thanks! But what ever you do, never give up, specially when you fail. Use your failures as your guide and try and try again, later on you will succeed.
dagob2 years ago
What an interesting instructable! Thanks for sharing!
I think you should explaing why it works (scientifically)
this is marvelous project...!!
bt u cn do better with carbon n zinc rod using general acids.. :) wel done
aschmois3 years ago
Great tutorial, my first try I had water leaking from everywhere and only a mere .3-.5 volts. Vinegar is NOT the best solution. I have tried and what seems to work best is Lemon Juice and Salt. (water and salt is still better than vinegar). The picture has two batteries in series which add up to a good 1.5 volts. However, for some reason I cannot get a light to turn on. My guess is that voltage reading stabilizes with a circuit, but the bulb cannot stabilize. Might also be the amperage not being high enough.
240382_1766586493647_1508721630_31716388_335081_o.jpg
ASCAS (author)  aschmois3 years ago
Nice job. I recommend you to clean each carbon rod carefully, there's a lot of manganese sticked on it. Second both metals should not touch. Third if none of this work make 2 more of this in parallel
ASCAS (author)  aschmois3 years ago
Yeah (:D) try adding a joule thief powering a LED bulb. It should work.
jmcdermott3 years ago
silly matrix, inside duh
chaitanyak4 years ago
most innovative - yet simple thing i found today! Good job!
Dipankar4 years ago
How long does the battery work? Good Idea. Keep it up.
I think we have a good kid here. Now if he'll take after you.
Yeh! He's a bright kid. Hope he does well in life.
artworker4 years ago
Innovative. Nicely done! It's sad that teachers don't encourage these projects in school! Every student should know these tricks. 5*

I luv it!

You gave me an excellent idea to be used at the science fair project.

But will you allow me to use it?

mlee wei2 months ago

wow lol so nice but how many volts is dat

Himers4 months ago

How long does the battery last and how many volts does it generate?

ASCAS (author)  Himers4 months ago

2 weeks, as long as you keep it wet.

franceserikey4 months ago
Can i use insulated copper wire instead of bare copper wire?
franceserikey4 months ago
Can i use battery calculator instead of solar powered?
ASCAS (author)  franceserikey4 months ago

Yup! there's no difference I suppose.

franceserikey4 months ago
Can you pls send me a video on how to do the water powered calculator
ASCAS (author)  franceserikey4 months ago

Just replace the LEDs with a calculator :)

lteodoro5 months ago

What kind of wire is used for the Water Powered Calculator?

ASCAS (author)  lteodoro5 months ago

Bare Copper Wire :)

ABC2XYZ5 months ago
How many volts does it produces?Is it enough to light up LED.
ASCAS (author)  ABC2XYZ5 months ago

My new version produces 0.6v - 0.9v and yeah it produces enough energy to power an LED, with the help of an inverter circuit of course (joule thief). In fact I was able to make a flashlight out of it.

Click Me: Water Powered Flashlight

xMontyPythonx5 months ago

Okay will someone please tell me why it looks like there is cotton in there, and tell me when i put it in there, since i believe there is some in there when do i put it in, and do i need to replace it every time i need to recharge it, because when i made mine i did not use cotton i only followed the instructions and it is not working for me. Neither the aluminium foil or the carbon rod are touching each other, the negative wire is touching the salt water. Will someone please tell me what i did wrong. Also i am going to be charging a home made capacitor, but ,beside the point, it is not having any output. Please help

ASCAS (author)  xMontyPythonx5 months ago

The tissue paper became mushy because of its long exposure to water. A lot of people got this to work. Have you tried checking your battery's polarities? Try to connect a volt meter, check if the battery has an output.

xMontyPythonx5 months ago

i did not use cotton do i need to?

ASCAS (author)  xMontyPythonx5 months ago

No, I used tissue paper but you can use any type of porous material.

xMontyPythonx5 months ago
Why don't you answer my q's
ASCAS (author)  xMontyPythonx5 months ago

Sorry, it's exam week. I forgot to check my ible inbox for such a long time. After all, my studies are my priority :D

yimn7 months ago
Under what topic is this project related to? Thank you
ASCAS (author)  yimn7 months ago
Chemistry under Redox reaction :D
yimn ASCAS7 months ago
Thank you sir! Uhm Do you have any idea on how i can relate this project to the topic electricity in physics??
noingwhat3 years ago
How much voltage and current do you get out of something like this?
And if you were to make it bigger or smaller, would that affect the voltage or current?
agishero noingwhat10 months ago
not the size but the surface area would make the difference
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