Designing a Timed Vibration Device for Children with Autism

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In summary, the person is trying to create a small vibrational device that they can attach to the wire arm of the glasses of their son with autism. The device will vibrate for 5-10 seconds every 5-10 seconds, and will last for about a week if it is powered by smaller watch/button batteries.
  • #1
midwest_medic
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Hi everyone. I am trying to design a timed vibration device that I can use for my son. He has a mild form of autism and he seems to need continual sensory input. We are attempting all different type of strategies but I have an idea I would like to try but do not have the needed skills. So, here I am. What I am wanting to create is a cyclic vibration device that is small enough to be attached to the wire arm of his glasses similar in concept to a chochlear implant for the deaf. I chose the arm of his glasses because 1. the motor would be small enough to not be stupidly obvious. 2. it would be located at or rest against the mastoid bone which is located behind and/or below the ear. This would give a vibrational stimulus that is both "auditory" and physical/tactile. 3. He wears his glasses always and would not need to try to remember to carry something else that could be easily lost. So, I am envisioning a small offset vibrational motor (like the kind used in pagers) because they are small, require minimal energy, and do not produce a lot of heat energy. This could be powered by a watch battery if possible. Ideally, there would be something like an cyclical timer/ 551 chip / a slow filling capacitor that would act like a timer. All of the components would, hopefully, be embedded into a resin base in order to make it fairly durable. I am envisioning a mold that I can take the old battery out and easily put in a new one. I realize this may be a tall order but I would appreciate any help possible. Thank You
 
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  • #2
Welcome to Physics Forums midwest_medic. Can you give a little more detail? How often would you like the vibration to occur and for what length of duration? Do you have a frequency of vibration in mind? Are you wanting this on both sides of the head or just one side? Would a small speaker (or pizoelectric device) work instead of a motor?
 
  • #3
Hi, thanks for the welcome and q's. So, let's see...1-2 sec duration every 5-10 sec's. Frequency? hmmm, hadn't thought of that. I assumed (you know what that gets you. LOL) that the small motors in pagers were pretty much the same frequency. Micro vibrating motors operating 10k-50k rpm? Thinking of something like this when I began to envision:
http://www.globalsources.com/gsol/I/Vibration-motor/p/sm/1008010618.htm
or
http://www.73.com/a/0185.shtml

Yes, pizoelectric device would also work. Hope this helps. Again, thanks for your assistance.
 
  • #4
Welcom, medic. I think the pager/cellphone buzzer is probably a good approach, as long as it vibrates with about the right amplitude for you (not too hard).

To calculate the battery life, look at the Amp*Hour (Ahr) rating, and compare that to your circuit's current draw. Like, the motor you linked to is 90mA when running at 3V, so to get 10 hours of operation at 10% duty cycle would take a battery with this capacity:

0.090A * (1/10) * 10hr = 0.09Ahr.

So if you used two type N batteries (1000mAhr each) in series to make the 3V, you could get about

1000mAhr / 90mA = 11 hours of motor running, or about a week of daytime operation.

But if you use smaller watch/button batteries, you may end up having to change them pretty often. Can you maybe build this into a baseball cap instead of the glasses? Type N batteries are small, but not compared to glasses.

http://en.wikipedia.org/wiki/Battery_(electricity )

Also, for the timer circuit, it would probably be best to use a simple digital timer circuit, probably based on the 74HC4060 integrated circuit chip. The 4060 has a built-in oscillator (you can connect a crystal or RC circuit to it to define the oscillation frequency), and a long ripple divider chain, to get you low frequencies with long periods like the 1-10 seconds that you want. You could do a little simple logic to generate a 1-second pulse every 8 seconds, for example. Here's the datasheet for the 4060:

http://www.fairchildsemi.com/ds/MM/MM74HC4060.pdf

.
 
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  • #5
I did a little search on Digi-Key for http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=720967&keywords=buzzer" that has a voltage rating of 1.5V and a current rating of 10mA. It provides 80dB at 2.048kHz.
 
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  • #6
dlgoff said:
I did a little search on Digi-Key for http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=720967&keywords=buzzer" that has a voltage rating of 1.5V and a current rating of 10mA. It provides 80dB at 2.048kHz.

He's trying to stimulate the boy, not blow his head off! :eek:

J/K. But you'd at least need to stuff that thing with epoxy or something to get the noise down to something more subtle, eh? The lower power is attractive.

medic -- have you gotten a few things to try out to see how they feel and sound? Like your motor and dlgoff's buzzer/beeper?
 
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  • #7
berkeman said:
He's trying to stimulate the boy, not blow his head off! :eek:
Yea, I was going to mention that it would probably be too loud. I was mainly looking at the frequency and current spec. I was looking at other cell phone buzzers and they were also loud. Most of them had to be bought in large quantities from China.
 

FAQ: Designing a Timed Vibration Device for Children with Autism

1. What is the design process and where do I start?

The design process involves identifying the problem or goal, conducting research, brainstorming ideas, creating prototypes, and testing and refining the design. The first step is to clearly define the problem or goal and the target audience. Then, research and gather inspiration from various sources such as existing designs, trends, and user feedback. From there, generate ideas and create prototypes to test and refine the design.

2. What are some important factors to consider when designing?

Some important factors to consider when designing include the target audience, functionality, aesthetics, usability, and feasibility. It is important to understand the needs and preferences of the target audience to create a design that resonates with them. The design should also be functional and meet the intended purpose. Aesthetics play a crucial role in attracting and retaining users. Usability and feasibility are also important to ensure that the design is user-friendly and can be realistically implemented.

3. How do I choose the right design elements?

Choosing the right design elements involves understanding the target audience and the purpose of the design, as well as considering the principles of design such as balance, contrast, unity, and hierarchy. It is also important to consider the functionality and usability of the design elements. Gathering feedback from users and conducting user testing can also help in choosing the most effective design elements.

4. How can I ensure my design is visually appealing?

To ensure a visually appealing design, use a color scheme that is visually appealing and appropriate for the target audience. Create a balance between text, images, and white space to avoid clutter. Use high-quality images and graphics that are relevant to the design. Also, pay attention to typography and ensure that it is easy to read and complements the overall design.

5. What are some common design mistakes to avoid?

Some common design mistakes to avoid include cluttered layouts, using too many fonts and colors, not considering accessibility, and not testing the design with the target audience. It is important to have a clear and organized layout to avoid overwhelming the user. Stick to a limited color and font palette to maintain consistency and readability. Accessibility should also be considered to ensure that all users can access and use the design. Finally, always test the design with the target audience to gather feedback and make necessary improvements.

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