What to do with pocket calculator insides?

What should I do with my calculator insides? The calculator wwas shaped like a ruler and it has an LCD screen, a circuitborad, a battery, some wires and a solar cell, but I have no idea what to do with it.

Asked by Cheezpaper 8 years ago | last reply 8 years ago


i want to modify my casio 991ms scientific calculator so that it can store text files .. plzz any one can help me??

I  want to modify my casio 991ms scientific calculator so that it can store tex files ..i think a external memory card and prorgramming will do tthis plzz any one can help me??

Asked by nmittal707 7 years ago | last reply 7 years ago


how do i save my research in my profile?

Asked by elein 8 years ago | last reply 8 years ago


how can i view all step on one page?

Asked by elein 8 years ago | last reply 7 years ago


TI-83 Buttons not working

On my TI-83, the bottom two rows of keys do not work. I took it apart an did the 'Contact Cleaner' but still no luck. Actually, the bottom rows and the 'trace' 'graph' and 'arrow' buttons do not work. Do I have to replace the entire board?

Asked by speedinc 9 years ago | last reply 9 years ago


My project X My Car = Lumber

Not sure where to post this but figured I'd at least got the right website. I drive a Scion xB (aka the angry toaster) so I know what lumber I can carry. I'm looking for a calculator that I can tell the number of pieces, their dimensions and what the max of my car is capable of and receive the number of different pieces of lumber I can should buy to complete the project. Does such a thing exist? The math and algorithm is relatively simple. I'm just to drunk to work it out at present and it'd be a site well worth having in my bookmarks. If you know of a site this is a quick post, if not what would you like to see in such a site? Example: Building drawers for my small work space (13' x 6')  the structure I've come up with to support the drawers requires a frame of  2x4's: 3x sides: 2x56" 3x7" cross members: 4x 25" 2x 54.5 How many 2x4's should I buy if the max length of 2x4 I can fit is 8'? (I love my scion xB) 

Posted by MichaelD158 3 years ago | last reply 3 years ago


Calculator Hacking, i need some Instructables. :(

Asked by Mplinnc 8 years ago | last reply 8 years ago


Ultimately Simple Calculator

Listed in the Built By Monkeys blog from Design News, comes the ultimately simplistic calculator that anyone can use. It can be found At this location

Posted by Goodhart 8 years ago | last reply 8 years ago


any good codes for a simple calculator? Answered

I wanna impress my friends with some cool calculator trick, unfortunately I no nothing about programming. Any body now' a good code ?

Asked by Quest for Questions 8 years ago | last reply 8 years ago


Can solar powered calculators charge a phone?

I was just wondering because if this is possible I want to know how to do it. I can get a lot of solar powered calculators....They're cheap.

Asked by Tech-Monkey 6 years ago | last reply 6 years ago


My calculator needs to become pretty!

I have this big ugly calculator and i really want to make it look really awesome... do any of you wonderful people know how i could do so? I would like to just give it a design or something- no sparkles or beadazzles. Thank you!:D

Asked by BrokenPins 7 years ago | last reply 7 years ago


TI Calculator Help

I have the TI-84 Plus Silver Edition and I have some questions. First I need to know how to graph the equation (x is greater than or equal to y) Also I put the quadratic program on my calculator but it gives the answer in decimal form, how do I view it in fraction form or is that even possible??

Posted by thouse 11 years ago | last reply 8 years ago



Calculator Programs for Math

I've been working on some programs for my calculator recently and have decided to share them. I made these myself from scratch. If you want to modify go ahead just credit me. Don't sell them. And don't use them in math class if your teacher says not to. The programs are a follows: a quadratic formula solver, parabola solver, slope of a linear equation finder, and y-intercept finder. The programs work on TI-83's and TI-84's. If you have questions on how to use them or how to put them on your calculator please leave a comment!

Posted by sardines454 11 years ago | last reply 6 years ago


TI-connect for calculator

I'm having trouble loading "TI-connect" on my mac so that I can write programs for the ti-84 on the computer. After downloading ti-connect, I click on it, and it seems to want to install it again. I've done the complete loop, repeating the download process about 4 times.  Do any of you know what to do?

Posted by Toga_Dan 6 years ago | last reply 6 years ago


How do i make a program for normal curve?

My prob and stat class has this assignment due in a month and its to be able to make a program for Normal Curve..Can anyone help me with this? I've spent the last 3 days trying to figure it out but I can't.

Asked by MathMan371 7 years ago | last reply 7 years ago


Replace calculator ink roller?

How to remove and replace ink roller in Sharp 1197S desk printing calculator

Asked by Julia Anne 9 years ago


How to replace ink roller in Sharp desk printing calculator EL1197S?

How to remove & replace ink roller in Sharp EL1197S desk calculator

Asked by Julia Anne 9 years ago | last reply 9 years ago


Stack Calculator (RPN)

Has any one made/have plans for making a stack calculator (reverse polish notation)? I kinda want to make one this summer so if no one else puts something up maybe I'll try to post something in the next couple months.Here is some info on RPN for anyone interested:http://en.wikipedia.org/wiki/Reverse_Polish_notation

Posted by hunt3131 9 years ago | last reply 9 years ago


Diode Calculator will not work

I've been working on a diode only (well, plus switches for input [numbers, yet there's only one pad! not one for each digit], resistors for various things, and LEDs for the display) calculator that could add two two digit numbers (xx+xx=xxx) for a while, putting countless hours into it.I have deemed it impossible.There's so many problems with a mass diode resistor network that is just won't work. As some and gates conduct then some other gate (like it's suppose to) conducts, and eventually causes a voltage divder (with the pull up/ pull down resistors) and the output gets wacky and there's no wway of amplifying the signal.The diode adder is dead

Posted by guyfrom7up 10 years ago | last reply 10 years ago


Personal electronics theft prevention

My daughter is going into high school and has had her scientific calculator stolen for three years in a row at school. These are pricey, running from $30-$40 each. Besides that, all the other things in her pencil bag, like compasses, triangles, pens, mechanical pencils. Frankly, I'm sick of my daughter not being prepared for class and spending money for the reprobates to just steal it.  Is there any way to tag her calculator economically to track it down?

Posted by hugabugs 5 years ago | last reply 5 years ago


Help with resistor calculator for LEDs

Hi everyone, I decided to try and build some LED lighting and found a few online resistor calculators but, I'm not exactly sure what to put for the voltage drop and the LED current (other than using the generic suggestions from the online calculators). So here are my questions... Is the "forward voltage" what you enter for the "voltage drop"? If so, do you use the lower or higher number? For the LED current, do I use the "max cont. foward current" or should I just put in the suggested 20mA? what kind of a difference would one be over the other? These are the specs given for the LED I'm going to be using (minus the unimportant stuff). Forward Voltage (V) : 3.2 ~ 3.8 Reverse Current (uA) : <=30 Absolute Maximum Ratings (Ta=25°C) Max Power Dissipation : 80mw Max Continuous Forward Current : 30mA Max Peak Forward Current : 75mA Reverse Voltage : 5~6V Thanks in advance.

Posted by GSXR 8 years ago | last reply 8 years ago


Where can I find a keychain-sized device to hash passwords?

Where can I find a device that can fit on a key chain or in a wallet (cell phones and graphing calculators don't count) and can perform a common cryptographic hash (like MD5 or SHA1) on a short phrase? I know there are proprietary single-use password generators and devices that store cryptographic keys, but I am curious if there are devices that use a well-publicized hash on the entered phrase but store nothing.

Asked by NobodyInParticular 9 years ago | last reply 5 years ago


How to make a calculator that divides by zero?

Hi New to the forum so not sure how it works here but basically asking a request for a instructable for any shop brought calculator that when asked to divide something by zero returns a number, maybe a  random number, but hopefully 42 everytime. Is this possible and if so could someone post the instructable? Cheers

Posted by blind oly 1 year ago | last reply 12 months ago


Interfacing With Glass Calculator LCD displays.

I have a bunch of those glass calculator LCD displays laying around at home and I was wondering if anyone had figured out a way to use them as regular LCDs. I have never been able to work with them in the past because they have all used the ribbon cable or foam thing to connect to the PCB. Is there another way that does not involve making a special PCB and enclosure to work with it, like with copper wires and some soldering?

Posted by awilson56 5 years ago | last reply 5 years ago


How can I make my computer recognize my TI 89 Titanium calculator?

I installed the TI 89 Titanium calculators installation disk before i plugged it in, like it told me to. At first things went well. I plugged in the cable after TI Connect was installed, and it installed the hardware. However, after it recognized the calc, i went on to update its OS. After I did, long and behold, the calc could no longer be recognized!!! it was OS version 3.00 for the TI 89, all i did was pressed the update link on the ti connect thing. Any help? The calculator is very new, probably 4 days old now and like i said before, the computer recognized it at first but now it cannot.

Asked by Gigafrost 9 years ago | last reply 9 years ago


Is it possible to download 'ndless and the gameboy emulator on the ti nspire cas?

I have attempted to download the emualtor for the gameboy on my ti nspire cas. But it did not work, i'm pretty sure it won't work, because in the readme file it said they only tested it on the ti nspire.

Asked by flashanimator 8 years ago | last reply 8 years ago


Old TI-85 Uses

I just got a TI-85 at a yard sale for a dollar. I already have a TI-84, so I have no need for it for school. Any ideas on what I use it for? Can I take it apart , build anything with it? Here are the specs: http://en.wikipedia.org/wiki/TI-85#Technical_specifications. It has a Zilog 800 cpu

Asked by Bostonians 8 years ago | last reply 8 years ago


Calculator data into a PC

I have a Check and Correct Calculator with 120 steps, I need to upload the data stored on the memory of the calculator, I mean the 120 steps all together into a excel file, or to a text file. Any ideas on how to convert a calculator into a small pad?

Posted by lmarkez 7 years ago | last reply 7 years ago


Resistance calculator using flash

I just created a resistance calculator using liveswif (its like macromedia flash only not as good) and programmed it with actionscript.   I can't figure out how to get the numbers to line up properly, although the calculator still works.   If you have a resistor and need to find out how many ohms it is, the calculator will do it.   http://www.gamesfree4u.com/resistancecalculator.html

Posted by pennsteve 8 years ago | last reply 8 years ago


555 Timer Calculator

Hi everyone, I was looking around on the internet a while ago for a calculator for 555 timer circuits and couldn't find one that worked very well. Then I set about making my own in a Excel spreadsheet to calculate the frequency and duty cycle for me. I have decided to share it with everyone to help others. It is quite simple. Enter your vaules into the yellow boxes and get your frequency and/or duty cycle from the blue boxes.

Posted by qwertyboy 9 years ago | last reply 9 years ago


Does anyone have simple programs they made on a ti-83/84 graphing calculator?

I have been making some and i want to see what other people have made and see how so i can farther my understanding

Asked by evilskaterpyro 9 years ago | last reply 8 years ago


Can i use a solar panel to charge a cell phone?

I made a call phone that looks like a calculator so i can use it in school and what not and everyone thinks its super amazing but the battery dies really fast, i checked my connections and nothings touching so i think the batteries defective but my friend gave me the idea to use the solar panel from the calculator the charge it. I get about 1 volt under normal lighting about about 2.25 volts under a bright light (directly under a light bulb).

Asked by Jimmy Proton 7 years ago | last reply 6 years ago


Budget Keeper Fridgemagnet, is this doable?

Howdy folks, I have an idea for a budget "keeper" and I'd like to know if it is doable. Here's my idea: Make a small (5"x7" maximum) lightweight budget calculator that goes on your fridge. It will keep "budget limits" for a few categories: Grocery, Fast-food, Non-Food, Car and "other". expenses. The intent is that at the beginning of the month you'd enter your budget limits for each category. Then when you get home each time after spending some money you'd enter in what category you spent in and how much. Then it would tell you how much you have left! This would be so useful to me! Maybe others? I'm not a circuitry/soldering kinda guy, but I am a C#/VB programmer, so I could write the logic on that level. Is this something that is doable from an "instructables" point of view? Thanks!

Posted by jimbox31 11 years ago | last reply 11 years ago


i need help with this code trying to make a basic calculator with two inputs and one output with VB2008 (Express)?

My code is Public Class Form1     Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click         Dim number1, number2, sum         number1 = TextBox1.Text         number2 = TextBox2.Text         sum = number1 + number2         MessageBox.show("the sum of" & number1.ToString() & " and " &number2.ToString;() & " equals " & sum.ToString() &)     End Sub     Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click         Dim number1, number2, sum         number1 = TextBox1.Text         number2 = TextBox2.Text         sum = number1 - number2         MessageBox.show("the sum of" & number1.ToString() & " and " &number2.ToString;() & " equals " & sum.ToString() &)     End Sub End Class Could any one tell me what is wrong with the brackets at the end of "Messagebox" the lines? im just guessing its an easy fix

Asked by Fox-san48 8 years ago | last reply 8 years ago


LED Voltage? Answered

So recently I had an idea to make a steam gun by heating steam with a NiChrome wire driven by a 9v battery, anyway, to keep it safe and so i knew when it was on, i decided to add an LED to the circuit. I went to http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator to see which resistor i needed. From what i understand, the resistor limits the CURRENT across the circuit. So, what i want to know is whether the Led will work with the first attached circuit and not bun out from the voltage, and whether the nichrome wire and led will work in circuit 2. EDIITTT: Well, after a few answers, i'm realising i cant run this off of a 9volt, so, what small powersupply could i use?

Asked by LiquidLightning 8 years ago | last reply 8 years ago


What do i do with my old printing calculator? Answered

Theres no ink and nothing useful to me on it other than the calculator part... soo any idears on what to do with it?... i would love a simple robot, or anything i could use that simple and useful

Asked by tjbtcb17 8 years ago | last reply 8 years ago


Resistor Voltage Drop

Is there any way to calculate the voltage drop of a resistor value? For example, if I had a 47 ohm resistor, would its voltage drop equal -30V, -857358V, or -0.5V?

Posted by puffyfluff 10 years ago | last reply 10 years ago


Where does a calculator get a random seed from? Answered

Most, if not all, scientific and graphing calculators have a #RAND button on them, this generally generates a random number between 0 and 1 (I think). Now, as we all (might) know, a calculator is a computer, and thus thinks in logic and cannot generate a truly random number, and, as we also (might) know, any pseudo-random number generated has to come from a seed value. Some things take it from the time and date, others from the time between a user's input, I have even heard stories of a program asking a used to 'bash wildly on the keyboard like a monkey'. So my question is this: Where does my calculator get its seed value from?By the way, I cut it into paragraphs to make it more readable

Asked by munchman 9 years ago | last reply 9 years ago


TI 84 Plus silver edition archive problem... Answered

I accidentally deleted all my archives on my calculator and that deleted all my applications, like block dude and stuff like that and i want to get them back, I have a connector cable to other calculators and the computer. Thanks

Asked by squirt8500 9 years ago | last reply 9 years ago


Interfacing to a TI Graph Calc

I was looking at how to interface an lcd screen to a microcontroller and learned they have a 14-16 pin interface. Guess what I found out? An old Texas Instruments calculator I tore apart has a 14 pin interface on the lcd screen, with the first two pins being power! Just like on a regular lcd screen! I am going to atempt to interface my OOPIC to it! If this works, I promise you there will be an ible!

Posted by gimmelotsarobots 10 years ago | last reply 10 years ago


can someone help me implement the Australia Post DRC postage calculator into my website?

Hello, i am starting up an online store , on behalf of yowee.tk , where i or rather "we", will sell things to raise money for the community vault! so far ive had no issues with building my the store into my website, however, now that i am up to writting up the listings, i need a template to copy off which each listing for each item will reside. each items page must show the price of the product, and the shipping cost . now heres where the problem starts i have no idea on how to implement the postage calculator from australia post, into the template, so that all items pages display the shipping cost depending on thebuyers location, so that anyone anywhere can buy from the site, and not just people within australia, and areas i need to pre-research the shipping price for, which will become inconvenient as the site grows. there are instructions for doing this on this link http://drc.edeliver.com.au however, i dont know how to put this into my website, or how it works, as it requires a substantial amount of coding. what i need to know, is how to , using the provided code ,set the variable which is being set as the value of a text box within a form, to the shipping price of that area, when i click a button, also in that form, but not have it leave the page. although, i dont want some variables to be accessable by the person browsing the page, such as the weight, which i want to be able to alter within the source code of my hmtl file. all i want the buyer to be able to do is select their location, press a button, and have the shipping rates to that place appear in the text box. the shipping calculator is the only thing missing from my website. whoever can solve my problem will get a best answer from me!

Asked by oldmanbeefjerky 7 years ago | last reply 7 years ago


Amazon's very expensive cable, and the comments for it.

Http://www.amazon.com/AudioQuest-K2-terminated-speaker-cable/dp/B000J36XR2/ref=pd_sim_sbs_e_18 I was flipping around on Kotaku, and came across a page talking about the MASSIVE rip-offs involving HDMI cables. I read the article and found this link in the comments. This is a $9,000 audio cable from Amazon. I went down to the comments (mostly to see if some idiot bought this), and found some interesting comments. And by interesting, I mean I fell out of my chair laughing.  -------------------------------------------------- Some comments: " We live underground. We speak with our hands. We wear the earplugs all our lives. PLEASE! You must listen! We cannot maintain the link for long... I will type as fast as I can. DO NOT USE THE CABLES! We were fools, fools to develop such a thing! Sound was never meant to be this clear, this pure, this... accurate. For a few short days, we marveled. Then the... whispers... began. Were they Aramaic? Hyperborean? Some even more ancient tongue, first spoken by elder races under the red light of dying suns far from here? We do not know, but somehow, slowly... we began to UNDERSTAND. No, no, please! I don't want to remember! YOU WILL NOT MAKE ME REMEMBER! I saw brave men claw their own eyes out... oh, god, the screaming... the mobs of feral children feasting on corpses, the shadows MOVING, the fires burning in the air! The CHANTING! WHY CAN'T I FORGET THE WORDS??? We live underground. We speak with our hands. We wear the earplugs all our lives. Do not use the cables!" - By Whisper ---------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- "If there is one cable I would whole-heartedly trust to my Chimera-hunting needs, this would be the cable. No other cable has the tensile strength to properly and efficiently garrote a lycanthrope, asphyxiate an Esquilax or even gag a mermaid. Last week, using my trusty AudioQuest K2 (retrofitted with lead weights, bright orange latex paint and a generous coating of crushed glass stolen from the window of an abandoned church at midnight), I managed to snuff 3 golden unicorns in swift succession!  Pros: Quickly tears through scales, fur, bone, and adamantium with ease  Coils and uncoils from hip holster (optional) quickly and quietly  For a product fabricated from 1,000 Onyx Dragon fetuses, the price is unbelievably reasonable!  Cons: Shipping from the R'lyeh took far too long  Doesn't come in 10' lengths (which would be perfect for hydra, cerberii and other multi-headed creatures)  After every use, I can feel 6 ounces of my soul slipping from my core into the ether. But this may be due to the fact that I prefer to work without gloves. YMMV.  Overall, I would recommend that any hunter buy one, nay, two, of these immediately, and experience the difference that upgrading to the K2 will make in your next quest!" - By Valannin "Pantheon Outcast"

Posted by ry25920 7 years ago | last reply 7 years ago


trying to hide a programmable calculator inside a regular school calculator to use in tests?

hi all I am not allowed to use a programmable calculator in exams, however we are allowed a scientific calculator. is there any way to convert one or mod a programmable calculator to look like a regular school calculator? cheers

Asked by thatfamousguy 7 years ago | last reply 7 years ago


How to calculate the percentage using cmd?

Heyyyyyyyyyy...how to calculate the percentage of two numbers using cmd?

Posted by Subhasis Biswas 4 years ago | last reply 4 years ago


Conical coil inductance calculation? Answered

Does anyone know a reliable calculation or online calculator for conical coil inductance? I am calculating this for a Tesla coil primary if anyone knows is a conical coil primary suitable for a 2000W system?

Asked by The MadScientist 7 years ago | last reply 7 years ago


how do you calculate the horsepower of electric motors? Answered

Asked by loki17 8 years ago | last reply 8 years ago


How can I re-align the screen on a TI-85?

I obtained a secondhand TI-85 for a dollar today. It didn't power on, so I removed all the batteries and put a jumper across the contacts for the memory backup, which cleared the memory and reset everything to default. HOWEVER, The LCD seems to be calibrated 4 pixels off. When anything is entered into the base screen, the left four pixels are off the display, leaving the fifth column of the character to be nudged up against the left side of the display. When I graph something, however, the display is centered. Any ideas what could be causing this? A second "Reset All" didn't help. I'm a TI-83 user, so I'm not familiar with the TI-85 interface.

Asked by CameronSS 8 years ago | last reply 8 years ago


Calculating Speed?

If you have an object with a mass of 2000 grams, and it has an average force of 635.029 kg pushing it for a distance of 6.096 meters before it becomes a free-flying projectile.  How fast is the object traveling after the 6 meters and how do you calculate it.

Asked by jj.inc 6 years ago | last reply 6 years ago


How to calculate amount of leather in sq feet for 16x12 inches bag

Please help me in calculating the leather consumption in making a laptop bag of 16X12x4 inches without any flap or extra compartments. How to calculate and convert inches to sq foot.

Asked by Lderex1 4 months ago | last reply 4 months ago