I got this idea 2 months ago. Me and my family were going on a road trip. we were in hurry. My Father's phone was discharged so he took the powerbank. When we crossed half of the journey our car's tire got punctured. My Father had the number of mechanic so he connected his phone to the Powerbank. But..... the Powerbank was also discharged. We waited there for too long for someone to help. As its rightly said necessity is the mother of invention. That time I got this idea, a Powerbank that gets charged by solar energy and rotatory or mechanical energy.
It has a emergency flashlight, Music reactive LEDs and Speaker. Its compact easy to handle and above all its Green i.e. runs on renewable source of energy.
Remember when you will charge it you will charge its li-ion cell, so it has a main switch, that changes the Powerbank from charge to discharge mode. Another pushbutton switch switches the L293D IC and starts the speaker and LEDs.
Please appreciate my hard work, vote for me in the contest and kill that follow button.
If you want to make one for yourself than all the parts are available on digikey store. Its a good site.
Here's the link to video
Here is the solar charging.
Step 1: Parts
• 1 * Hardboard
• 1 *Old laptop battery(or li-ion cells)
• 3 * 5V voltage regulator(here7805)
• 2 * DC Adapter jack
• 2 * White LEDs
• 4 * Blue LEDs
• 1 * Audio jack
• 4 * Switches
• 1 * LM386 IC module
• 1 * 8 ohm speaker
• 2 * TP4056 Balance Charging Module
• 1 * TIP 35 or 31
• 3 * Voltage reg. Heat sink
• 1 * Motor
• 1 * 5V solar panel
• 1 * DC 10V adapter
1. Hot glue
2. Soldering iron
3. Solder wire
6. Rainbow Wire
7. Wire cutter / stripper
8. Poster Colors and Brushes
Step 2: Battery Breakdown
Be careful while doing this select the right multimeter slot and prevent short circuit.
Note: Lithium -ion cells are not meant for beginners because they have high power density.
Step 3: Assembling the Battery
Step 4: TP4056
The battery is divided in 2 sets each consisting 2 cells connected in parallel and these 2 sets will be connected in series so to give a thresh hold of 7.01 V.
Connect + of Set 1 to Bat+ pin of TP4056 and - of it to Bat- .
Use another TP4056 for Set 2 and follow the same.
For easy handling tape each Set .
Step 5: Mains
join the 2 sets in series when to be used to charge mobile and will connect t the same to sets in parallel on charging of Powerbank.
Connect IN- of both the TP4056 to the 2 terminals of switch.
Connect positive of Set 2 and negative of Set 1 to opposite ends of switches(so that at the same time when these two are in contact inside the switch the - terminals are disconnected)
Now when positive of Set 2 and negative of Set 1 are in contact than positive of Set 1 and negative of Set 2 has a potential difference of 7.01V.
I colored this switch red because its not meant for playing.
I will try my best to explain you the circuit in next step.
Step 6: Speaker and LEDs
Solder the GND of audio jack to the third pin of TIP. and any one of the other to the first pin of TIP.
Solder the + terminal of LEDs to + of battery and negative of LEDs to TIP middle pin (follow the circuit).
Solder the speaker to the module. There is no +/- in speaker solder directly. Take 2 terminals out of battery and solder to +/- of LM386 module.
Solder audio jack positive and negative to LM386 signal pins.
Note: Details on making an audio amplifier is not given here. You should must look at some audio amplifier instructables . Or search the web for Great Scott, he is a great guy.
Step 7: DC 10V Adapter and 7805
Solder a DC adapter jack to PCB take the Positive terminal from it to 7805 reg. 1st pin and the Negative terminal to 7805 middle pin. Do the same for one more 7805(on the same jack). Take the third pin(7805) to IN+ of TP4056 module do the same for another module too.
Top Tip: Connect appropriate heat sink to 7805 voltage reg. because they become very hot when in use.
Step 8: Solar Charge/ Mechanical Charge
Now solder positive terminal of DC adapter jack to the first pin of 7805 and the negative to the middle pin. Solder a switch to the third pin of 7805 and join the other terminal to TP4056 IN+, join IN- to the middle pin of 7805.
Now the Powerbank is ready to be charged by solar energy just insert the adapter of Solar Panel to jack and switch the button , it will charge.
Step 9: Connection Final
TP4056: Connect positive terminal of Set 1 to Bat+,Connect positive terminal of Set 2 to Bat+(of other module).
7805 regulator: There are 3 7805 voltage regulator used here 2 for DC adapter, 1 for Solar charge. 1st pin of it is input voltage, 2nd is ground, 3rd is output. For efficiency you can also add capacitor to it.I didn't add a capacitor.
That's it for this step.
I have drawn the circuit on an art sheet sorry for my poor hand writing.
Step 10: Flashlight
Step 11: Taping
Step 12: Old Charger Breakdown
Take out the circuit board, find a capacitor rated above 220 V solder 2 wires to it attach these wires to the + of Set 1 and - of Set 2 .
Be careful with polarity, capacitor + to Battery +.
We will use the charger pin to charge mobile phone.
Step 13: Enclosure Built
Drill holes for LEDs and a large hole for speaker.
For cutting use paper cutter.