0

I connect battery to ItsyBitsy nRF52840 but not working.
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

I connect battery to ItsyBitsy nRF52840 but not working.

by LiuToki on Sat Jun 05, 2021 11:21 pm

Hello.
I use Adafruit ItsyBitsy nRF52840 Express (https://learn.adafruit.com/adafruit-its ... s?view=all)

I already programmed to this board and checked its works with USB connection.
The program is like a keyboard with a bluetooth connection. And the LED on the board lights up when the power is turned on.

And then I decided to use the battery and plugged in the Li battery to BAT pin and GND pin.
But, not working.
I connect the battery + to BAT pin and - to GND pin.

When I measure the voltage between the BAT pin and the GND pin, I have confirmed that it is about 4V.

Is there anything else wrong?
Also, please tell me if you need any other information to resolve.

Thank you,

LiuToki
 
Posts: 6
Joined: Sat Jun 05, 2021 11:04 pm

Re: I connect battery to ItsyBitsy nRF52840 but not working.

by dastels on Sun Jun 06, 2021 8:50 am

Does it work with both USB and a battery connected?

Can you measure the voltage on these pins: 3v, EN, Vhi. Ideally with just USB, just a battery, and both connected.

Dave

dastels
 
Posts: 6787
Joined: Tue Oct 20, 2015 3:22 pm

Re: I connect battery to ItsyBitsy nRF52840 but not working.

by LiuToki on Wed Jun 09, 2021 8:10 pm

Hi, Dave.
Thank you for your reply.

I Check the voltage following pins with the 3 ways.

- Only USB
3V: 3.26[V]
EN: 4.88[V]
Vhi: 4.94[V]

- Only BAT
3V: 0.00
EN: 0.00
0.00

- Both USB & BAT
3V: 3.26
EN: 4.90
Vhi: 4.95

By the way, When I connected both USB & BAT and measured the voltage of between BAT and GND, it was 7.28[V].

Ray.

LiuToki
 
Posts: 6
Joined: Sat Jun 05, 2021 11:04 pm

Re: I connect battery to ItsyBitsy nRF52840 but not working.

by dastels on Wed Jun 09, 2021 10:26 pm

What are you using for a battery?

Dave

dastels
 
Posts: 6787
Joined: Tue Oct 20, 2015 3:22 pm

Re: I connect battery to ItsyBitsy nRF52840 but not working.

by LiuToki on Thu Jun 10, 2021 9:47 pm

I use Lithium rechargeable battery.

Spec is 3.7V 900mAh 1.8A.
I charged with the charging circuit before using it.

If I can use DC 5V(from using AC/DC) instead of battery to BAT pin, I'll try to check whether the battery is broken.

Ray.

LiuToki
 
Posts: 6
Joined: Sat Jun 05, 2021 11:04 pm

Re: I connect battery to ItsyBitsy nRF52840 but not working.

by LiuToki on Wed Jun 30, 2021 10:52 pm

Hello.

I check AP2112 Datasheet and that VIN max voltage is 6[V].
So I input 5[V] to BAT pin(from using AC/DC).
I confirmed that there is a voltage of 5V between BAT and GND.
But following pins are 0[V].

3V: 0.00
EN: 0.00
Vhi: 0.00

Is this a problem with the main unit?
Is there anything else I should check?

Ray.

LiuToki
 
Posts: 6
Joined: Sat Jun 05, 2021 11:04 pm

Re: I connect battery to ItsyBitsy nRF52840 but not working.

by LiuToki on Sat Jul 03, 2021 2:02 am

Hello.

I requested a friend who has the same product to apply a voltage of 5 [V] to the BAT pin to see if it works.
Then, it works(Look at the following image).

So, I think my device is maybe broken.
So sad...

What should I do ?
Do I have to buy a new one again?

Ray.
Attachments
image0.jpg
my friend device.
image0.jpg (256.46 KiB) Viewed 43 times

LiuToki
 
Posts: 6
Joined: Sat Jun 05, 2021 11:04 pm

Re: I connect battery to ItsyBitsy nRF52840 but not working.

by LiuToki on Sat Jul 03, 2021 2:26 am

Hello.

I found why my board does not work.
Look at the picture!
WTF, the VBAT diode is not mounted!

Can you to send me a new board?

I bought this board DigiKey Electronics through marutsu online(https://www.marutsu.co.jp/).

Thanks.
Attachments
image0.jpg
WTF, the VBAT diode is not mounted!
image0.jpg (271.45 KiB) Viewed 43 times

LiuToki
 
Posts: 6
Joined: Sat Jun 05, 2021 11:04 pm

Please be positive and constructive with your questions and comments.