How i can make led glow only when my iphone is full charged?
I want to make iphone charger circuit.
Please reply with schematic as i am new with electronics.
Thanks.

 

How i can make led glow only when my iphone is full charged?
I want to make iphone charger circuit.
Please reply with schematic as i am new with electronics.
Thanks.

The first question would be, how are you going to have this circuit know what the charge level is?

I would think it would be possible by writing an app for the iphone that monitors the current voltage level then broadcasts that level over something like Bluetooth to a microcontroller with Bluetooth.

That project would be way, way too advanced for someone new to electronics.

I think you have a solution looking for a problem. Just look at your cell phone to see if it is charged.

 

Your iPhone has a Lithium Ion battery. Go to www.batteryuniversity.com to read about its charging.
When its voltage reaches its maximum of 4.2V then it is not even half-charged. It is fully charged when its charging current has dropped below about 1/20th its mAh rating.

 

This charger chip includes a charge stats output to light that LED for you.


Miniature Single-Cell, Fully Integrated Li-Ion,
Li-Polymer Charge Management Controllers <= link to datasheet

 

This charger chip includes a charge stats output to light that LED for you.

View attachment 139514
Miniature Single-Cell, Fully Integrated Li-Ion,
Li-Polymer Charge Management Controllers <= link to datasheet

How is TS going to get access to a battery sealed inside a cell phone?

 

Good catch!

I only come up with the solutions, the TS can work out the details. (After Churchill's elaboration of his solution to the WWII German U-boat problem: "Boil the Atlantic")

More seiriously, he won't be able to make a circuit to tell when to light the LED if the battery is in the phone.

 

No iphone batteries are removable, and all iphones have internal battery charger controllers.

You cannot monitor the battery condition externally.

ak

 

No iphone batteries are removable, and all iphones have internal battery charger controllers.

You cannot monitor the battery condition externally.

ak

Already mentioned twice.

Make the led glow at certain voltage
Make the led glow at certain voltage

 

How is TS going to get access to a battery sealed inside a cell phone?

U can strip the usb wire and use the +- wires to check the battery status

 

You might be able to monitor the amperage being used. It would be very little when the battery is fully charged.

 

U can strip the usb wire and use the +- wires to check the battery status

Using a non-Apple cable means slower charging. The Apple brand cable has a small IC in the connector for communication/sensing for fast charging. How about using the little icon in the upper corner of the iPhone screen.

 

U can strip the usb wire and use the +- wires to check the battery status

Very doubtful that will work. You need to monitor that status of the battery not the charger. Likely a blocking diode would need to be used. Monitor test point between the battery and diode.

 

You might be able to monitor the amperage being used. It would be very little when the battery is fully charged.

Yes, the LED would also light if the battery has failed to charge.

 

You might be able to monitor the amperage being used. It would be very little when the battery is fully charged.

But as I mentioned above the TS has a solution looking for a problem. Just look at the phone!

 

But as I mentioned above the TS has a solution looking for a problem. Just look at the phone!

need to see the phone charge from

Using a non-Apple cable means slower charging. The Apple brand cable has a small IC in the connector for communication/sensing for fast charging. How about using the little icon in the upper corner of the iPhone screen.

that is too easy, I want to make something new so you can check the status from distance while the iPhone is charging!

 

But as I mentioned above the TS has a solution looking for a problem. Just look at the phone!

that is way too easy, I want to innovate, make something new, I want to monitor the battery status from distance while is charging.

 

that is way too easy, I want to innovate, make something new, I want to monitor the battery status from distance while is charging.

Then write an app that reads the charge status and displays it on the screen big enough to see from a distance. Or that changes the color of the screen as it charges. Or that lights up the screen only after it has reached some threshold.

 

Then write an app that reads the charge status and displays it on the screen big enough to see from a distance. Or that changes the color of the screen as it charges. Or that lights up the screen only after it has reached some threshold.

I was thinking that TS could write an app to notify another cell phone.

Your idea has some possibilities. Maybe an app that turns on the screen then a light sensor laid on the screen that lights an LED. Sort of a Rube Goldberg method.

 

You might be able to monitor the amperage being used. It would be very little when the battery is fully charged.

Back when I was servicing emergency lighting systems, the 12 volt wall mounted unit with two lamps, the charger had a regulator circuit that held the voltage at 13.6 volts (and was adjustable to a degree). When the battery was taking a charge - that charge passed through a low voltage light bulb. The light bulb acted as a resistor to limit the current to the battery. When the battery charge was low the light would be bright, but as it came up to the float voltage it would dim significantly. In some cases it would go out all together.

BUT: That was charging a dumb SLA battery (Sealed Lead Acid). AND the charger was a dumb charger. We'd set the float voltages by using a large capacitor to come up to the float voltage quickly and then from there we'd adjust the voltage. Sometimes those batteries were wet cell batteries. Sometimes they were NiCad. I can even vaguely remember "Mercury" batteries. Can't be certain on that one, but I think I took some dead cells home and accidentally charged them reverse polarity and they took the charge (reversed). (don't ask me how that's possible)

With your iPhone, you're not going to have the same sort of charger. The wall wart supplies its voltage and current. On board the battery or in the phone's internal circuitry the charge process is controlled. Hanging an LED in the circuit isn't going to do anything useful but greatly slow down the charge rate for your phone.

I have an iPhone. I charge it from my iPad charger and this afternoon I took it from 25% to 100% in just a few hours. No need to "Monitor" the state of charge. Personally, my opinion on your project is that it wouldn't be a worth while endeavor. More likely to be just the opposite - very costly and virtually untenable.

 

that is way too easy, I want to innovate, make something new, I want to monitor the battery status from distance while is charging.

Write an app that reports the state of charge and makes the iPhone beep when it is charged.