It's completely rechargeable, via USB or wallwart (5v), only takes an hour to fully charge the lamp. If you remember my previous project "DIY Portable USB Solar Charger", you can charge the jar using a solar panel. Guys, it's free and renewable energy!
Top 10 Practical Uses (Must Read):
1st.) Portable Emergency Light
2nd.) Camping Light/ Lamp
3rd.) Floating Pool Lanterns
4th.) Nightlight (Sidetable Lamp)
5th.) Constant Camera Light
6th.) Waterproof Rescue Lights!
7th.) Solar Powered LED Lamp
8th.) Garden Props & Ornaments
9th.) Replacement for gas lamps
10th.) Halloween Lanterns (Modded Version)
Real Life Scenario (My Experience):
(11/8/13) - A Category 4 typhoon has entered the Philippine area of responsibility. Codenamed: Yolanda
(11/8/13) - The president declared a state of calamity, told to brace ourselves.
(11/8/13) - My parents told me to charge all our lamps, unfortunately 2 out 4 emergency lamps were broken.
(11/8/13) - I made a simple "Jar Emergency Light" in just 5 minutes!
(11/9/13) - Typhoon reached our area with extreme rain and winds.
(11/9/13) - 1:00am The Blackout Started, my 1st time to use the LED Jar :D
(11/9/13) - It feels so cozy to light up a whole room as if there was electricity!
Step 1: Gathering Tools & Materials
- 3W Ultrabright LED (Radioshack or AC LED Bulbs)
- Red LED Indicator (Recycled Parts)
- BL-5C Nokia Battery (Old Nokia Phone)
- 1N4007 Recitifer Diode (Recycled Parts)
- 470 ohm Resistor (Radioshack or Recycled Parts)
- On/ Off switch (Recycled Parts)
- DC Power Jack (Recycled Parts)
- Scotch Mounting Strips
Tools & Equipment:
- Soldering Iron
- Hot Glue Gun
- Portable Drill
Step 2: Scavenging for Parts
Where To Scavenge Parts (Macgyver Style):
- Broken Radios, CFL Bulbs, Toys
- Busted Flashlights, AC LED Bulbs
- Old Nokia Phones (I have no use for my Nokia)
- Home Inventory
- Resistors, Switches, DC Plugs, LED Indicators
- Some Working High Powered LEDs (cuz it's in series)
- Li-Ion Batteries (ex. BL-5C)
- Glass Jar, Utility Knife, Tape, Gluegun
Step 3: Hot Glue the Parts in Place
2nd.) Solder two wires to your BL-5C's positive and negative terminals.
3rd.) Hot glue everything In place!
4th.) Use a small strip of Scotch's mounting pads to mount the 3W LED (BTW, they don't melt)
Want To Make It Waterproof?
Don't drill holes, just hot glue the socket and switch inside the jar/ lid. Just unscrew the lid to charge!
Step 4: Optional: Adding a USB Lithium USB Charger
You can buy it here for $1.70! "1A Lithium Battery Charging Module - Blue"
Red Light = Charging
Green Light = Fully Charged
Step 5: The Schematic Diagram
How Does The Circuit Work?
This is a very simple circuit that doesn't require circuit boards. All it does is trickle charge the battery, a rectifier diode was added to prevent the backflow of current. I added a LED charging indicator just to show whether the jar is charging or not.