Devices acknowledge charging source, but won't charge.
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- twinegarner
- Posts: 15
- Joined: Sun Jun 09, 2013 10:00 am
Devices acknowledge charging source, but won't charge.
Full disclosure - I was a bit hasty to case up my recent project and put the board in raw into an altoids tin, believing the case was aluminum and non-conductive. Did I short it?
Thanks in advance!
- adafruit_support_bill
- Posts: 88093
- Joined: Sat Feb 07, 2009 10:11 am
Re: Devices acknowledge charging source, but won't charge.
Solder looks OK and your voltages are fine. Can you measure the voltage with a phone plugged in?
What kind of batteries are you using?
What kind of batteries are you using?
- twinegarner
- Posts: 15
- Joined: Sun Jun 09, 2013 10:00 am
Re: Devices acknowledge charging source, but won't charge.
With a phone plugged in, I get 4.65v and 1.8v. Batteries are Duracell alkalines.
- adafruit_support_bill
- Posts: 88093
- Joined: Sat Feb 07, 2009 10:11 am
Re: Devices acknowledge charging source, but won't charge.
That is a significant drop. Most phones will drop out of charge mode with voltages like that.With a phone plugged in, I get 4.65v and 1.8v.
Duracell makes many kinds of alkaline cells. Not all of them are suitable for charging a modern smart-phone. Standard alkaline battery chemistry is not very good at delivering high current. The high internal resistance of these cells causes the output voltage to drop under high-drain conditions.Batteries are Duracell alkalines.
The "Duracell Ultra" is specially designed for high-drain applications. For other battery recommendations, see the bottom of this post: http://forums.adafruit.com/viewtopic.php?f=15&t=22377
- twinegarner
- Posts: 15
- Joined: Sun Jun 09, 2013 10:00 am
Re: Devices acknowledge charging source, but won't charge.
Picked up a pack of Duracell Ultras and can now confirm that charging is happening. Batteries are toasty, chip is hot to the touch, and phone charge raised from 59-72% charge in about 15 minutes. Odd thing is, that under charging, pins 1 and 4 are still reading 4.65v. Perhaps my volt meter is faulty.
Anyhow, thank you so much for the help!
Anyhow, thank you so much for the help!
- adafruit_support_bill
- Posts: 88093
- Joined: Sat Feb 07, 2009 10:11 am
Re: Devices acknowledge charging source, but won't charge.
It is really a question of whether it can maintain that voltage under a full charging load. When the phone detects a charger, it will try to pull current from it. Virtually all chargers will have a drop in voltage under load. But if the voltage drops below some minimum threshold, the phone will back-off. Some phones will continue charging at a lower rate. Some will give up entirely.under charging, pins 1 and 4 are still reading 4.65v.
Please be positive and constructive with your questions and comments.