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

Or plays a song

 

My current ohone is a Samsung Galaxy 7 using Android. It has a light which is red during charging and green when 100% charged, Also plainly visible is the state of the charge, There must be a dozen apps out there to monitor battery level. Most of these phones include apps telling you anything you could want to know about the battery and power consumption.

Ron

 

If you want to monitor the battery charging status from a distance enable Find My Iphone. You can then use a web browser on Apple's site to see the charge level and whether the phone is charging or not.

I suppose some resourceful person could figure out a way to control an LED based on information from the browser.

 

Old Android phone:
Usb connector:
1) blinks (crys) when it wants to be fed
2) Steady when it's charging
3) Off when it's fully charged.

Green only. I like the blinking aspect,

It won't charge and tether forever like my old Razer did. This one will deplete the battery first.

 

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.

That would be great if i know how to do it

 

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

Never seen one of those - all mine; the back unclips and you can pull the battery out.

my phone doesn't even display; "charging", so I rotate 2 batteries through a commercial universal charger. Then I know its charged when the indicator changes from red to green.

 

Never seen one of those - all mine; the back unclips and you can pull the battery out.

my phone doesn't even display; "charging", so I rotate 2 batteries through a commercial universal charger. Then I know its charged when the indicator changes from red to green.

You need to join the 21st century like me. My battery comes out too but the youngsters today have these new fangled phones where the battery is sealed inside. They tell me you can get on the interweb and everything.

 

I'm building a USB DCP to charge phones from a 12-16V source for a university project. I thought about monitoring charging status by using a shunt resistor to determine how much current the phone was drawing and switching an led to show the status, but it was primarily to check over current. I reckon it is possible with a shunt and comparator, but realised it was pretty pointless and just not worth the hassle.

 

You need to join the 21st century like me. My battery comes out too but the youngsters today have these new fangled phones where the battery is sealed inside. They tell me you can get on the interweb and everything.

I've got a highly technical smart phone - that also has a removable battery.

 

I've got a highly technical smart phone - that also has a removable battery.

Who makes a smart phone with a removable battery?

 

Who makes a smart phone with a removable battery?

HTC.

 

HTC.

LG did too, at least when I got my last one from them just a couple years ago.

 

How to close this thread as I cannot find correct answers for my question?!

 

How can i ad led to usb cable so the led can lite when phone is fully charged or there would be even bettter if i can use rgb led so it can lite red for low, blue for half charged and green for fully charged phone?
I would appreciate if you reply with schematic so i try it straight away!
Thanks!

 

One word- "No"

Modern cellphone batteries and charging systems are complex, you cannot derive the state of charge without some complex software and circuits that communicate with the charging system.

 

You can't monitor the voltage, since that's not a reliable indicator of the battery charge state.
But assuming the smart charger reduces the charge current when the battery reaches the fully charged state, you could monitor th current and turn the LED on when the current drops to a specific (experimentally determined) value.

I doubt there's an easy way to determine the half-charged point.

 

How to close this thread as I cannot find correct answers for my question?!

Just stop posting to it.

You found answers, Just not the answers you want. There have been several good suggestions including monitoring the current.

 

(As moderator) This thread has tended to wander a little. Please try to keep on topic and solve the thread starter's problem.