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Hi Friends,

Welcome back to creativity buzz.

Here I make LED drawing copy pad for all students.

For this, you need 15 LEDs and acrylic sheet. You only need to stick acrylic sheet and place LED panel inside this.

Step 1: LED Connection

Take 15 No of LEDs and Solder these LEDs in Parallel connection as per Picture.

First of all, you need to cut extra wire of LEDs and then take the soldering iron and tin wire to solder this 15 LEDs.

Step 2: Wire Connection

Then get one black and red insulated wire and solder to a negative and positive pole of LEDs.

Then get two shrinking tubes and protect from shortcircuiting.

Step 3: Charging Module Connection

Then Get one 3.7 Volt Charging Module and solder second and of black and a red wire to negative and positive respectively.

Then connect Data cable to this charging module and OTG pin to your smartphone and connect together.

If your connection is perfect then the lights will glow.

Step 4: Make PAD

Take one Clear acrylic sheet in a dimension of 30 X 26 cm and remove the protected cover from the back and front side.

Step 5: Polishing for Diffusing LEDs

Take one small pease of glass paper and polish front side of the acrylic sheet.

During the polishing, you need to check the polishing is better or not?

Step 6: Stick One Foam Sheet

Take clear glue and one 30X26 cm white sheet and stick this foam sheet to back side of an acrylic sheet.

Step 7: Joint Frame

Get two pease of 4 X 26 cm black acrylic sheet.

Then stick clear acrylic sheet to end of black sheet as per pic.

Step 8: LED Panel Fitting

Take LED panel which we making and place this inside black acrylic sheet.

Then provide cover using a second acrylic sheet.

Step 9: Enjoy!

Your LED Copy pad is ready for use.

Take one drawing print and one plain paper.

Then turn off room light and turn on the LED pad.

You can see drawing lines of printed paper and you can draw exactly on plain paper.



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    3 Discussions


    Question 5 months ago

    What does charging circuit do?. Is it protection for smartphone? Could you just solder LEDs directly to USB cable?

    2 more answers

    Answer 5 months ago

    You could just use any 5V battery charger (like the one of Your old smartphone) by adding one appropiate resistor between the + of the cable and the + of the LEDs (220, 330 Ohm resistor should do the trick) just to limitate current, avoid overheating and saving the component's life


    Reply 5 months ago

    I recon he used the charging module to act as a voltage dropper for the leds.

    As stated a resistor would be cheaper.

    Just connect an old lipo phone battery and make it wireless.