DIY KIT-V2DIY KIT-
In India, one of the world's most populous countries, more than 74 million rural households live without electricity.
Children learn from harmful smoke. The average person spends 5% of his income on lighting fuels. People burn wood for lighting.
You can find all my projects where burning an estimated 80 litres of fuel in a single kerosene wick produces more than 250 kilograms of carbon dioxide per year.
Multiplied by emissions from developing countries, kerosene lamps emit 270,000 tons of black carbon per year, equivalent to 240 million tons of carbon dioxide.
To help people living in the countryside, I made this solar bulb. -
Reduce costs by replacing harmful kerosene lamps.
This will enable the world's poor to replace kerosene with clean solar energy. -powered light.
I got inspiration from Nokoro.
I always like to use old things to do something to recycle.
I made this solar bulb with second-hand materials and some electronic components. Features :1.
Charging up to 20 lights a day-22 lumens (
About three times the brightness of kerosene lamps.
All night. 2.
A 2,000 mA AA battery can be fully charged in two days of sunlight.
You can use suspension and multi-functional bracket to charge.
Hang it on the outside wire or put it in your window. 3. Uses high-
High quality nickel-hydrogen batteries can be used for at least 5 years. 4. Uses a high-
High-quality solar panels that charge batteries. 5.
Turn off automatically in bright light to save money and turn on in darkness. 6.
Overdischarge protection circuit for storage battery. Advantages :1.
Improve literacy: Solar bulbs improve literacy because people can read more easily after dark than candles or kerosene lamps. 2.
Energy Conservation: Light bulbs are charged by solar energy（free energy)
It saves energy. 3.
Reduce air pollution: Using solar bulbs can reduce local air pollution.
With the decrease of kerosene used for lighting, the pollution will be reduced accordingly. 4.
Reduce greenhouse gases: Solar bulbs do not produce carbon dioxide. (CO2)emissions. Uses :1. Night Lamp2. Reading Lamp3.
Portable emergency lights 4.
Camping and hiking lights 5.
Garden/lawn lamp accessories: 1. Solar Panel (
2V, 40MA or 2V 150MA or 2V, 300MA)2. 0.
5W straw hat white LED（eBay )3.
Rechargeable AA/AAA Batteries（amazon )4. IC QX5252F (eBay )5. 33uH Inductor (eBay )6. Switch (eBay)8.
AA/AAA Battery Seat（eBay )9. Wires10.
The prototype board 11.
Plastic container 12.
Aluminum alloy door 13. PCB V2. 0 (PCBWay )
Note: Choose any of the above three solar panels. TOOLS:1. Soldering iron 2. Hot Glue Gun3. Pliers4.
The heart of this bulb is a very small four-legged IC QX525252F.
Its working principle is very similar to the Joule Burglar circuit.
But the advantage of using this chip is that it does not need a bulky ring coil.
It can do the same job with a simple inductor, an AA/AAA battery and a light emitting diode.
Most solar garden lamps use this small smart chip.
When a mentoring friend of mine discussed this issue with me and sent data tables and information, I met with these IC's. Connection: pin-1 -
> Positive end proteins of solar panels-2 -
> A Leg of Battery Positive and Sensory Protein-3 -> All ground (
Solar panels, batteries and LED negative terminals)Pin-4 -
> Before welding the circuit, the other leg of the sensor is always a good idea to prototype any circuit on a test board.
This checks to ensure that all components work properly.
Follow the sketch and circle the bread rack.
If the circuit is normal, the LED should not emit light.
To simulate dark conditions, cover the solar panels with your palms.
Now, the LED should shine.
To check the performance of the circuit, I removed the LED and connected the oscilloscope probe.
The output is not a stable DC voltage, but a fast fluctuating voltage.
In my case, the frequency is about 184. 5 KHz.
The peak-to-peak voltage is close to 7.
28 volts, the average is about 1. 0 to 1. 20V.
Note: If you try to measure the voltage with a normal meter, it will display a voltage close to your battery.
Because your meter can only measure the average of fluctuating voltage. 1.
Battery: You can use any AA or AAA rechargeable battery.
From my experience, I can say that batteries are the best.
They are pre-sold. -
Charging status allows you to purchase directly after use, just like a standard alkaline battery.
It can be reused 2100 times.
When they are not used, they can last longer than conventional nickel-hydrogen batteries.
It can maintain 70% of the electricity after five years of use.
For more details about Eneloop batteries, click here. Although standard alkaline AA batteries can also be used, you cannot charge batteries with solar energy. 2.
Solar panels: rating: 2V solar panels are very suitable for charging AA Ni-MH batteries. (1. 2v).
With the voltage of solar panels, rated current is also very important.
The higher the rated current, the faster the battery charges.
I use 2V, 150MA solar panels.
Choose according to your choice.
Size: During the purchase process, make sure that the panel size fits on the cover.
In my case, 55. 1x55. 1x3. 59mm3.
Inductor: LED brightness can be controlled by using different inductor values.
LED power supply according to data sheet=（2* Vbat / L )* 10^-
6 According to my observation, 33uh and 47uh are very effective for 0.
5W straw hat LED.
You can also try other values to let me know which values are good for you. 3. I used 0.
5W stray Hat White LED.
It produces very bright light.
I can say that a fully charged LED is enough to meet the basic lighting needs.
The specifications of the LEDs I use are shown in the figure above.
You can also use standard white LEDs, but they don't produce enough light.
Drill two holes with opposite diameters near the top of the container.
It will be used to install suspensions.
First, cut the hanger with the back edge of the pliers at both ends.
Now use the suspension part and keep the straight part for future use.
Trim at both ends according to your preferred suspension height.
In my case, it's close to 12 mm.
Bend the nose forceps at both ends.
Then insert the end into the previously made container hole.
Now it's time to use the straight part of the hanger.
First bend in the middle.
Then make two folds 9 centimeters away from the center.
Make two folds of length 1 at the end. 5cm each.
Insert plastic containers at both ends and cover them.
This bracket is very useful for 1.
Charging: During the charging process, the direction of the solar panels can be changed to obtain maximum sunlight. 2.
Lighting: To focus the light, you can change its orientation.
In order to make a complete circuit, I welded the components to the perforated board.
I enclosed a schematic PDF format.
You can use it during welding.
All solar panels have pre-marked terminal polarity.
One is positive. （+ )
The other is negative. （-).
Weld a red and a black wire to the positive and negative electrodes of the solar panel, drill a 3 mm hole in the center of the cover.
Put the wire from the solar panel under the cover.
Glue the lid and press the solar panels firmly. (
You can also cover the hole to ensure better air tightness.
Coat hot glue on the back of battery rack.
Put it under the cover and press it until the glue dries.
Trim the red wire of the battery rack in two parts.
The trimmed parts are welded to the central terminal of the switch, and the red wire is still connected to the battery cage on the external terminal of the switch.
Cover the joint with an insulating tap to avoid short circuit.
Solar panels and battery wires are welded to the circuit board.
The red line is the positive pole and the black line is the grounding connection.
Spread hot glue on the center of the bottom of the cover.
Press the circuit board to fix it completely.
The switch is then placed on the side of the circuit board and glued around it.
Use a lot of glue, but be careful not to touch the inner edge of the lid, otherwise it will no longer be suitable for containers.
Then wrap the extra wires with tape.
Insert the battery into the battery holder.
To test the lamp, slide the switch to the "on" position and turn off the indoor lamp.
Close the lid and you're done.
Charge the light to keep it in bright sunlight.
Tilt the lampshade to the sun for quick charging.
I hope my solar bulb can provide lighting for many rural residents around the world.
If you like this article, don't forget to pass it on!
Follow me to do more DIY projects and ideas. Thank you ! ! !