# [video] 1D Accelerometer

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This is a test of a video Instructable. The whole process was filmed and edited down to the bare bone steps.

Project: Build a one dimension accelerometer from simple household supplies. Use it to see how many G's you are pulling in one direction. A better accelerometer (two dimension) is in the works, so sit tight.

Let me know how the concept of a video Instructable is. From what I have seen, there is more complete instruction and you can see how everything is done. The drawbacks are that you have to watch a video instead of reading, so it will take some more time.

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## 17 Discussions

Question for you. Instead of adding additional nuts to mark the G ratings on the tube couldn't you just use the one nut? Example mark tube where +1G mark is flip it over mark where -1G is then measure space between +1G and -1G and place a zero G mark. Then you just measure the space between the zero G mark and +1G mark and and use that distance to mark the rest of the spaces out?

4 replies

is the rubber band "spring constant", well, constant for all stretch? is the force exerted by the rubber band with respect to how much it is stretched linear? i don't think it is. but we can confirm this by asking ""intoon"" if the spacing he got with the multiple-nut method is equal for each g-interval

correct me if this isnt answering your question but when you are adding another object(weight) of the same size it is doubling the weight of the object because weight is the force of gravity on an object so when weight is doubled it is equal to doubling g's...... g's r the how many more times weight is added(example: 2 g's equals 2x the weight of its normal weight under 1 earth gravity)......... hey u should probably know, most likely your older than me since im only 13.

there you go. you're correct. doubling the object doubles its weight, doubles its 'g'. unfortunately, the stretch of the rubberband is not linear. for example, to get to from 0g to 1g, the nut may move an inch. but to get from 1g to 2g, it may move less than an inch, as confirmed by intoon. therefore xenuthemagnificent's suggestion for calibrating the accelerometer wouldn't be very accurate.

The force exerted by the rubber band is not linear, and therefore the gap between G's gets smaller as the force gets greater. The only problem with this setup is that the rubber band builds up inertia with its springyness and therefore can botch the results. This will only work well on G forces that are sustained long enough for you to actually see a clear reading.

so do you convert the Gs into accelration metre per second?

This is definitely the format I want to see dominate. Written instructions and diagrams are welcome too, but nothing can match the sheer bits of info in video representation, as carl sagan might say, billions and billions. This could change the world, you know?

nice video. my thought is, why not upload it to youtube http://www.youtube.com/watch?v=LKaRmKzCDvI
and then insert it as a link? it took a long time for me to download your video. the file i have linked is 98MB .mov because the original frame size was way too big. anyway, it seems as though by inserting a link instead of the .mov people could see your video mas rapido.

2 replies

very good point, although isnt there some limit on youtube? But hosting this large a file from instructables cant be the most efficient distribution method for both your bandwidth and our download times - get flash enabled already.

100MB or 10 min. which ever comes first, however if you register as a "director" the MB's and length are increased.

Cool, bit shaky though. Was the camera attached to your head? Idea: add optointerrupters to the sides.

2 replies

my computer has no way to add anything my name

Hmmm, I tried uploading a 34 meg video on the last version of the site... It got to the end and never went through... I assumed there was some sort of size cap for uploaded files :/ I'll check this out tomorrow at work while my internet does not suck :P