Showing posts with label alarm. Show all posts
Showing posts with label alarm. Show all posts

Thursday, September 16, 2010

Inventions Running Around the Blockhead

This article is about some inventions I've thought about lately—ones that are real, and ones I'd like to see become real. Maybe other people can think of inventions they'd like to see in the marketplace, or ones they'd like to create themselves.

I'm impressed with
the miniaturization of computer text. Electronic text displays have come a long way from movie and billboard marquees to very compact displays on phones and name tags. In between those sizes and times, one of my former co-workers came up with a handheld communicator. The intended user, someone incapable of speech (mute), could type text and show it to others. At that time, it seemed a big breakthrough to replace the-paper-and-pencil method I've seen in numerous movies and TV shows over the years. (The most recent instance I saw was a character in a VERY POPULAR TV SERIES communicating by writing down text in English. She had temporarily reverted to speaking in Korean only as a result of her head knock.)

One device I've not seen many of is the programmable scrolling-text name tag, although I've seen lots of ads for them. The links that have most caught my eye are at http://tinyurl.com/AmazonScrollingMsgBadge, http://www.thinkgeek.com/gadgets/electronic/7c54/, and http://www.usbgeek.com/prod_detail.php?prod_id=0598.

One name tag owner I know has had her tag for over a year, and she says she still gets lots of comments. Another person I know has created her own, using spare parts. She says she's gotten lots of comments also. These devices are good for conversation icebreakers. They're novel, not that common. People react to motion; vision edge detectors provide information about relative locations over time. (Companies that target children take full advantage of kids' attraction to motion in addition to using colors and shapes.)

Devices I've appreciated
pertain to grocery stores. Two of them are the self-service checkout station and the techy produce scale.

  • The self-service checkout station, found in some stores and in one big box home improvement store, is convenient when I have few items. I consider using the station much speedier than an express line.
  • The techy produce scale doesn't just weigh something. I provide the code for the item and print out the price ticket. It's a good way to verify the item name, unit price, and total price.

Would like
a computerized merchandise mapper. When I go to the store looking for something I don't get frequently, the hunt is often a challenge. When it comes to drugstores, home improvement stores, or department stores, I dislike the hunt even more. For me, I feel I waste a certain amount of time hunting for things because

  • I have no idea where the item might be.
  • I have only a faint idea where the item might be.
  • The store moves the item or the category, whether it's down the aisle or over an aisle or two.
  • I don't know if the store carries the item.
  • I don't know if the store has discontinued the item.

Using a store computer, a customer would select a search term, drill down to more specifics if desired, then have the screen display a map of the store with a customer "You are here" icon and a "It is here" icon. The map might even include a dashed line to suggest a pace route. Think Google walking route map on a smaller scale.

Would like
a dental-mirror-size dual-mirror device wearable for backstroke swimming. I don't like getting my face in the water, so I prefer to do the frogkick backstroke. The downside is not being able to see where I'm going. The logical way to cope is to note reference objects above and slow down or stop accordingly before hitting the the pool wall. Some enterprising soul could come up with such a head-hugging device that has multiple, adjustable, even telescoping positions. The positions would make the device adaptable for different views, even for wearing on a walk to avoid fast approaching, uh, objects.

Would like
a lightweight, transparent, sandwichboard clipboard with broad base for holding papers vertically--useable for paper sheets and recipe cards, and other similar media.

Magnetic or spring-clip holders with concave surfaces are ok, but the curvedness, which I assume exists to help with holding the paper upright, is a small detraction. Flipping pages requires repeated motions if I'm working with manual-size documents. Rotating the device results in convex text, not quite as easy to read as concave text.

I've also tried using large, approximately 2" wide, square, clip magnets. Because the edges are straight, they don't help keep the piece of paper rigid. Adding a piece of thin cardboard, curved slightly backward, helps some, but the non-transparency makes it necessary to flip the paper over. I also tried folding over a piece of transparent mylar to try using it like a sandwich configuration with the paper in the middle. No good. The "sandwich" flops over from the high center of gravity, pulling the clip(s) over.

For a few days, I've laid down a 2" clip with a piece of paper in the jaws. An existing water jug serves as a back wall so the paper rests against it and the text faces me.

Would like
a hybrid hand-buzzer and audible noisemaker. My primary application inspiration is notifying when a small-department meeting or the speaker is running overtime. The hand-buzzer aspect would be the size, shape, and main trigger, pressed by the owner. I suppose a keychain fob would also work, although similarities between devices could result in visual confusion. The noisemaker aspect would be a device that emits variable noises and volumes. I'm not talking about radios, although engineering overdesign might include that feature also.

The noise types could be limitless--short ding chime for gentle notification, loud and long raspberry or body noise for demonstrative disapproval notification. Another application would be use as a hand-held alarm. Sure, I know there are pocket alarms, but they seem pretty feature-limited. Of course, now that I'm talking about variations in noise and volume, the device would require more controls than just a dead man's switch.

For added versatility, the noisemaker could include a bright LED for use as a flashlight. How about muscling it up by also adding a laser pointer for use in meetings? Problem might be that an annoyed meeting attendee might use the lights to harass others. Another feature to consider adding is a sound sampler/player. How cool to record and play back sounds or voice clips of your choosing! The imagination runs amok! Uh, oh, the mischievous self is periscopically poking just above the surface.

One device is more of a curiosity for me rather than something I consider life-changing. I wonder why brass mouthpieces are round instead of lip-shaped. Lips aren't shaped like brass-instrument mouthpieces; brass mouthpieces aren't shaped like lips. ??

Tuesday, July 13, 2010

Ailing Fridge and DIY Door-open Alert Unit

This article is about addressing a refrigerator that wasn't optimally turning on and off and a gadget that sounds off to help prevent at least one possible reason. Three possible common causes for a sickly refrigerator are a malfunctioning compressor, dirty coils, ice inside the freezer walls, or a combination. The refrigerator part of this article discusses assessing for and resolving for ice inside the walls—defrosting the entire unit and cleaning it during the process. The gadget part (DIY door-open alert unit) of this article discusses the project.

Ailing Fridge

I've occasionally taken out an armful of items, then forgotten to fully close the door. One problem has been the compressor overworking, causing icing up inside the freezer walls, resulting in appliance underperformance. Recent symptoms indicating all was not well included the following:

  • The fridge seemed to be running all the time instead of in on/off cycles.
  • Eggs toward the back of the fridge froze or partially froze.
  • Water pitchers occasionally wound up with shallow icy layers.
  • Fresh spinach leaves froze about the upper three leaf layers.

Tweaking refrigerator settings didn't seem to always resolve the problems. The longer-term process for resolution was to defrost the refrigerator/freezer, which included emptying it out and leaving the doors open for a couple of days, ensuring any possible ice in the walls would melt and the water drip away. The main sections of the process are total defrost preparation, defrosting, and cleaning.

Preparation for Total Defrost of the Refrigerator

  1. Over time, consume all freezer items.
  2. Over time, consume fridge items that needed refrigeration. If not consuming them all,
    1. Give them away.
    2. Throw them away.
    3. Obtain dry ice to store the items in an ice chest for up to 48 hours.
    4. Ask someone a favor of storing the items.

Defrosting of the Refrigerator and Freezer

  1. Turn off all controls.
  2. If you have an icemaker, turn off the water supply to it.
  3. Unplug the refrigerator.
  4. Completely empty out the refrigerator.
  5. Empty out the refrigerator's drip pan.
  6. Leave the refrigerator's doors open.
  7. If possible, place buckets or pans underneath the open doors to catch possible melting-ice drips.
  8. Monitor for drips for a day or two. Could be messy.

Tasks to do During Defrost Wait-Time

  1. Remove shelves, crispers, and other removables and wash them. (I washed mine in the bathtub using soapy dishwater.)
  2. Wipe the refrigerator interior surfaces with a solution of 2 tablespoons baking soda and 1 quart water. If your own manual specifies otherwise, follow that manual's instructions. Rinse with clean-water rinsed/wrung cloth. This stage might take several passes to wipe down all the surfaces.

DIY Door-open Alert Unit

The fridge door-open alert unit is useful to remind people to close the refrigerator door. After several seconds of the refrigerator door being open and the photocell being exposed to light, beeper emits a continuous whine. When the door closes, the sound decreases until the capacitor has been fully discharged. The device also serves as a good reminder to reduce time putting away cold groceries and also minimize dawdling in front of an open fridge.

The information and schematic for the Refrigerator Door Alarm is at http://www.techlib.com/electronics/kitchen.html. Note that the author suggests a 10uF capacitor across the battery, but doesn't show it on the schematic. (We omitted that capacitor also.) As this project is intended for a DIYer who does not require hand-holding and can fill in blanks, I have not included step-by-step information to create it.

If you are a hardware DIYer, you can obtain the parts fairly easily and breadboard and test the guts one day. Another day, you can wire and solder the discrete parts onto a project board, power the unit up, and have it operational. If you want to fancy it up, you can put the project into a metal project box, then set it in a small plastic tub to keep it off refrigerator shelves.

The parts came from hobby part drawers, Radio Shack (photocell from 5-pack 276-1657, buzzer 273-0059/273-059, 1/2 board 276-148), and Fry's Electronics (2 NTE123AP equivalents to 2N4401 transistor substitutes for the NPN Darlington transistor—seemingly not a commonly stocked part, zener diode NTE5009A). Overall packaging notes are as follows:

  • Already having a Bud Industries CU3000A aluminum project box on hand that measures 2.75" x 2.12" x 1.62"
  • Placing standoff-function hardware at the box's base to allow horizontal placement of a 9-volt battery (power source) beneath the assembled board—standoffs or spacers also suitable (Used 6-32 machine screws, nuts.)
  • Placing the buzzer outside the box for sound carrying (Used 2-56 machine screws, nuts.)
  • Drilling a hole on the box's side opposite the buzzer for light to reach the photocell

Note: In our case, we used a project box. When doing the final assembly, screwing the lid on required time that exceeded the time allowed before the alarm went off—an annoyance until the unit went inside the fridge and the noise fully abated.

Visit a lighter side of a refrigerator alert unit, which does not include a time delay before sounding off.