dapj Gadgets

Electronic organ and Metronome

2008-04-15T16:54:00.001+05:30

An electronic organ is an electronic keyboard instrument originally designed to imitate the sound of a pipe organ. It has developed today into two forms of the instrument, the imitation pipe organ as used in churches, and the Hammond organ-style instrument used in more popular music genres. Electronic organ - Wikipedia

A metronome is any device that produces a regulated audible and/or visual pulse, usually used to establish a steady beat, or tempo, measured in beats-per-minute (BPM) for the performance of musical compositions. It is an invaluable practice tool for musicians that goes back hundreds of years. Metronome - Wikipedia

audio-visual-metronome project page

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Musical Projects and Circuits

Musical Software and Webware

Basic Digital Electronics Tutors

2008-03-07T12:44:00.001+05:30

Astable 555 Timer Flasher

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If you are starting with electronics, this is the first step. So do it now ! Do-It-Yourself.

LED Running lights CD4017.
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Related Resources -

Digital up down BCD counter

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Realted Resources

The Source Code - digital-tutors - project page.

Digital Dice Cubes

2008-02-04T12:25:00.001+05:30

Digital Die Cube Toy, Click the Dice Cube, Wait, It will Display a Random Result, A random generation for rolling and one for showing value. Electronics Dice gadgets we can build listed below. .

Project Page - digital-dice

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Alarm Clock User Instruction

2008-02-04T06:31:00.001+05:30

User and Instruction Manual of Digital Alarm Clock Gadget

Description of Gadget

This can be used to preset Five Alarms with a small text memo, The Alarm will remind after set time elapses with musical sounds. It also shows the Time and date. The Alarms once set, repeat every day. When the user visits the page containing this gadget, it reminds him of the missed memos for the past three hours. Web Gadget for Google Homepage or Website. A study of the Alarm Clock Instructions Video may help understand points below.

digital-alarm-clock The Project Page Add Gadget to Webpage

Controls and Display

A - Buttons

Select Alarm - Click this to start the setting of the Alarm Clock, The button lights up green and remains lit for two minutes, this is the set mode (Figure-2). This button will scroll the Alarm Number on the left of this button from 1-5 as you click repeatedly. Select the Alarm you want to set. After two minutes the setting mode ends automatically and the changes you made are saved. You can continue setting or modifying the alarms by clicking this button again.
Select Digit - Once an Alarm Number is selected, set the Alarm Timefor that, Click this button to Select a Digit you want to set, A Grey Arrow (Figure-2) will appear on the top of the digits, it will move left till the end and then move right as you click more.
Scroll Value - Now that the Grey Arrow is above a particular Digit or the AM-PM indicator in Alarm Time, Click this button to Increment or change the value. Now repeat this for every Digit and the AM-PM, for setting the Alarm Time you want. Do this by using the Select Digit and Scroll Value Buttons as explained.
Save Memo - This Save button and Enter Memo in Figure-2 come to view only when you are setting the alarm, Key the text into Enter Memo box and press the Save Memo button. When the Alarm goes off on a later visit to the page (within 3hrs of set time) or on the Desktop at exactly the alarm time. The memo and time will remind you the task.
Enter Memo - When alarm is being set, this Text Edit Box Appears along with the a Save Memo button, Enter a short memo of Task to remind on Alarm.This is a memo to remind you what this alarm is for, like "Go to the Market".
Music - This comes up, as soon as you have saved the Memo (Figure 3), there are 10 short tunes, 0-9, which can be played and chosen by pressing the button beside the tune number.
Ok Done - This button is pressed to stop the Alarm sound after you see the message or Hear the sound, it will not sound again on that day. But if you make any new settings the Alarms within the last three hours will sound again. This happen in Normal run mode.

B - Outputs

Time Display - This shows the time, the hours and minutes as per your computer clock, The AM-PM indication too.
Alarm Time - This displays the Alarm Time that is being set with four small orange digits and a small yellow AM-PM display. In the Run mode it comes up, when alarm sounds.
Alarm Number - This shows the Alarm number Being Set, When an alarm sounds this will show the alarm that is playing.
Seconds - This is the seconds display of the Actual time on your Computer,
Memo - This Show the Task or To-Do that the alarm was set for, like "Visit Dentist" , this will show with the Alarm Time and Alarm Number.
Sound - The Music or Sound set, will be played when Alarm turns on at the set Alarm Time.

Working

After Starting up, The Alarm Clock Time Display shows the time Hours, Minutes and the Seconds display the seconds. (Figure-4). The Set Mode is not active. A Text display show the Day, Weekday, Month and Year. The Week Number of the year also is shown.

If the Alarm was set and cookies enabled in your browser, the Alarm sounds at the set time, even if you visit the Homepage within three hours of the set time, the Alarm sounds. If an alarm has been set at 1.00 PM and you visit the HomePage at 2.00PM it will Sound.

Alarms cannot be deleted, if you do not want an alarm set it for sometime in the Night when you have the computer off. New settings overwrite old.

Requirements

This Gadget requires Firefox or Internet explorer Browser to operate well. If Sound is enabled in your system, with System Volume and External Volume Controls at Medium and the browser plugin for your browser set correctly, the alarm music sounds will be Audible. The computer Clock should be set correctly and the Small Battery in the Computer must be replaced when this clock stops. This is a Hardware requirement and is not a problem most computers. Computer's clock can be set accurate using an atomic clock server.

All Alarm and note settings are lost when cookies are deleted from your browser, the settings you made are on your own computer browser.

Bugs

The three hours of alarm remind duration works oddly at the 12.00AM and 12.00PM vicinity, i am setting this right later. That means if you set the Alarm for Night 10.00 PM or 11.00 PM it will sound when you visit the page at 12.10 Noon.
The Cookies 18 will be brought down to Five or less in my next improvement, this way it will not use much Cookie space which is sparse.

The next update will take time, it may not be visible to you, you may not need to make any changes or upgrade, it will happen in the background.

User Feedback

Suggestion - Get rid of the number "shadows" in the background of the clock. Put in colored skins, colored lettering [red, lavender, green, orange, purple], colored borders, background, etc. for us to adjust the clock. Allow us to CHOOSE these elements of design for our desktop. -- EA -US

Complaint - The alarm clock is keeping correct time, but it doesn't sound off an alarm after being set. Do you have a tutorial for users? - COG - US
Answer - Enable cookies, read this page cookies enabled. If you still have problems i suggest you use the Firefox Browser.

Question - How do i delete an alarm? - AP
Answer - Just set a new alarm in its place, it will overwrite. In case you dont want to use an alarm, out of the five available, set it to 00.00 PM or any time at night. The set mode turns off after 3 minutes automatically, just press select again to start setting.

Suggestion - Thanks, I'm checking out your alarm. Anantha, why don't you post the User Manual address and the youtube video example in the description of your gadget? You will get a lot more users if you do. I will tell you how it works for me. - AL

Complaint - forget my first comment...this thing does not work. when I go to change the first digit in time (say for 11:30am, the gray cursor will not permit it the change from zero to any other number). And yes, I am running Firefox and yes all the other numbers and AM/PM will change. What good is a clock where you can't set it for 10 or 11am/pm...? this was a big waste of time.... - WA

Answer - When you want to set the first digit to 1, ensure second digit is set to 0,1,2, if second digit is 3 to 9 the first digit will be locked at 0 to avoid setting a time like 19.45 AM as this is a 12hr clock.

If you want to give a feedback or suggestion just Tell Me.

Alarm Clock Gadget Page - iGoogle

Digital Alarm Clock Manual - Anantha Narayan delabs - Rev 1.2

Instruction Video

Alarm Clock Instruction Video

RGB Color Mixer Gadget

2008-02-04T06:14:00.001+05:30

This is a HTML RGB color mixer, I was inspired by CPick and RGB Mixer. It helps you get the shade of color you want for a Webpage in HTML Hex Code or for a Program GUI that you are designing in RGB weights.

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For Children it is fun to play with and understand what Black, Grey, Brown, White are made of and How Cyan-Magenta-Yellow and other Fine Shades can be synthesized by just playing with the three Sliders.

color-mixer - Project Page

Related Resources

Analog Bargraph Clock Gadget

2008-02-03T22:47:00.000+05:30

Analog Clock, Linear Display of Time Elapsed using Bargraph, Shows Week Days and Month Days Passed. The WD indicates Complete Week Days passed and MD is Month Days Completed. This is not the date, date is MD+1. This is an example of CSS Animation, that was the Motivation for this clock.

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Related Resources

Mobile Website Browser

2008-02-01T09:07:00.001+05:30

This Gadget helps browsing wap webpages on Desktop Computer. It can also be used to browse .mobi websites, Assists Web Design of Pages with Mobile Phone Accessibility. Webmasters can use this to make Mobile Friendly pages.

Project Page - wap-browser

Add to Webpage -o- -o- xml for Google Desktop

Related Links -

Help -

To use this Gadget in Google Home page, Click arrow on tab and Edit Tab, then select layout shown below. Drag Drop Wide gadgets to the Wide side.

Simple Hourglass Clock Gadget

2008-01-02T07:54:00.000+05:30

Simple Hourglass Clock, Track Time Progress, Shows Time, Date, Weekday and Week of Year. Time flies but the Hourglass Clock helps you keep a watch on the endless flow of time. This fights procrastination, then the project will be done in time. There Aint No time left, Act Now. Finish the Box.

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Related Resources

Learn Digital Logic Gates Operation

2008-01-01T08:30:00.000+05:30

The Gate is a digital component that is used to compute an output for certain inputs, the inputs and outputs have two states high-1 and low- 0. Let us assume high is 5V and low is 0V (like in CMOS). On a high level the LED will light up and on a low level the LED is off. Now let us see what Logic means. digital-tutors - project page.

This page requires images and javascript to be enabled to try out the demo of the gates below.

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Digital Logic Gates

Gates are what make many of ICs, the two popular families are the 40xx CMOS and the 74xx TTL . Now 40xx come in 74HCT40xx flavors which approach the quality of an ideal gate. Entire circuits with Gates can also be also be burnt into PLDs, FPGAs and CPLDs just like you burn your CDROM. Gates can also be implemented in assembly language which a microcontroller like 8051 will understand and execute.

Hardware gate circuit will operate in real time, nano seconds delay will be there due to propagation delay, gate capacitance and FET switching times etc. Software or microcontroller gates code working will depend on both propagation delay and the CPU clock speed.

Gates can be combined to make combinational or sequential logic circuits. combinational circuits are a complex network of gates interconnected to evaluate a pattern of output for patterns of input. Sequential circuits use memory elements hence output patterns depend both on input patterns and the memory of history of events. An example of combinational logic circuit is a seven segment display decoder CD4511 and and example for a sequential logic circuit is CD4029 up-down counter.

The CD40xx CMOS family can work at even 3V-9V-12V DC and consume low power. The speed is not as fast as 74xx TTL family. It is good for simple portable battery powered circuits. The 74HCTxx series is good for low power and high speed but will work at 5V. When you have problems interfacing CMOS and TTL use 74HCTxx family.

Aircraft Dashboard Clock Mimic Gadget

2007-12-08T17:00:00.001+05:30

Digital Clock with 24 hour Military Time Format, Aircraft Dashboard Chronometer Like Looks, Date, Time, Weekday and Week of Year. Clock Gadget, looks like a Clock in Cockpit Dashboard. It is a Mimic of A Flight Chronometer Instrument. It shows Time and Date close to Military Time-Date format. It also has week number and weekday display.

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Project Page - avionics-chronometer

Related Resources -

Pin Note Gadget for Google Homepage

2007-08-27T13:06:00.001+05:30

This is a Tiny memo Pad that will have Sticky Notes on Webpage, saves in cookies. This Web Gadget is for the Google Homepage, Web-page or blog. The project page and the source is at pin-notes.

The inspiration for this has been ATnotes - Create notes on your desktop and Stickies. Which i have been using for some time.

Add to your Page or Blog - - - - xml for Google Desktop

Note - This is toy or fun gadget not for serious note taking, it is more an example of css-dhtml-js for study or learning. If you want a sturdy gadget i suggest Google Notebook.

Instructions -

Enable cookies, read this page cookies enabled. If you still have problems i suggest you use the Firefox Browser. If you clear all cookies from your browser, then the notes also will be deleted.

If the gadget says "On Cookies", for Firefox go to Tools->Options->Privacy, Check Mark the "Keep until they Expire"

Digital Alarm Clock Gadget

2007-07-02T07:21:00.001+05:30

Digital Alarm Clock Web Gadget with Musical Alarms

This Web Gadget is for the Google Homepage, Web-page or blog. You can set Five Alarms with Ten Selectable Musical Sounds and a small Text memo.

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The Project Page digital-alarm-clock

The simulation is as close as possible to a uC based Clock which you could build, The GUI is more like a electronic gadget than a Software Application. That should charge you to build your Alarm Clock today.

Alarm Clock Projects, Kits and Circuits

Alarm Clock Software and Real Clocks

Cookies Issue -

This gadget uses 18 Cookies nearing the Limit of 20 per Domain for IE and others also have limits.

If the gadget says "On Cookies", for Firefox go to Tools->Options->Privacy, Check Mark the "Keep until they Expire"

In Internet Explorer Tools->Internet Options->Privacy, set it to "Accept all Cookies" or "Low" - Then visit the page with this gadget, make an alarm setting or two - Then Revert the Privacy of IE to Default-Medium.

A Better Solution is Tools->Internet Options->Privacy -> Advanced Select "Override Automatic Cookie.." Then Check Mark the "Prompt" in both types. Now when you visit a site you will be asked by a prompt, Check Mark "Apply,,," and press "Allow Cookies", if you trust the site.

To add to desktop.google.com Start your Google Desktop, Press the (+) on top of sidebar "Add Gadgets". Then in the Search Box at Top-Right copy and paste (right click of mouse) the URL below. Then Add The Gadget in View. The IE Settings apply to this usage too.

http://digital-alarm-clock.googlecode.com/svn/trunk/index.xml

Digital Seven Segment Clock Gadget

2007-05-21T14:40:00.001+05:30

Digital Clock Web Gadget for Date and Time

This Web Gadget is for the Google Homepage, Web-page or blog. It has seven segment display, similar to traditional Digital Clocks in the dashboard. It will also indicate the date and week.

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seven-segment-digital-clock The Project Page

The javascript is as close as possible to a c program that you could write for a PIC processor, So then try and make a gadget which is 3D, using PIC or 8051.

Gadgets as Visual Interface for Process Control WebApps

2007-04-01T15:44:00.000+05:30

Here is is gadget GUI for Industrial Process control, WebApps. The buttons make a sound and Light up internal LED lamps. Power On-Off control, Digital Timer; Start, Reset Scroll and Select are the controls.

Project Page programmable-digital-timer Rev-12 - Add to Webpage

I will first make some simple examples with this UI. Then i will try to interface the javascript with PHP-MYSQL Application. I am just Thinking Loud. This makes a Globally Distributed Process Control Possible. :~) . You can Use html-js-php-msql. You can use ajax-python-perl too.

But for now, back to earth, I will just complete some more simple tutorial gadgets. This Idea of mine is Open Source, please keep it that way.

The advantage is that the industrial process or Home automation can be monitored and controlled on any computer including tablets which has a Browser. The plant automation or Home appliance can be regulated even as you travel back from factory to home. Or in any city from the Cyber Cafe. A Wireless Lan and Computer with Browser is all you need.

Press The Power on-off for a soft start, this is to prevent the inrush current from stressing the javascript components. Then it goes to a display test. The Start button can run or stop timer by toggling. The reset will Bring timer to 0000, format is min-sec.

Set by pressing select to get a marker over orange digit, Use Scroll to set number. Press Start to start timer, Start to be off to set again. The buzzer will turn on when Time elapsed matches time set. and the alarm relay trips. And a Flashing Annunciator signals end of process. Now Reset will start process again and stop flashing LED.

To use this like a regular instrument, you need a small portable hand-held computer with browser. Fix that in a Cabinet by filing or grinding it to size and wire the relays and supply. :-)