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,
I connect battery to ItsyBitsy nRF52840 but not working.
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- LiuToki
- Posts: 6
- Joined: Sat Jun 05, 2021 11:04 pm
- dastels
- Posts: 15659
- Joined: Tue Oct 20, 2015 3:22 pm
Re: I connect battery to ItsyBitsy nRF52840 but not working.
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
Can you measure the voltage on these pins: 3v, EN, Vhi. Ideally with just USB, just a battery, and both connected.
Dave
- LiuToki
- Posts: 6
- Joined: Sat Jun 05, 2021 11:04 pm
Re: I connect battery to ItsyBitsy nRF52840 but not working.
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.
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.
- dastels
- Posts: 15659
- Joined: Tue Oct 20, 2015 3:22 pm
Re: I connect battery to ItsyBitsy nRF52840 but not working.
What are you using for a battery?
Dave
Dave
- LiuToki
- Posts: 6
- Joined: Sat Jun 05, 2021 11:04 pm
Re: I connect battery to ItsyBitsy nRF52840 but not working.
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.
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.
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.
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.
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.
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
-
- my friend device.
- image0.jpg (256.46 KiB) Viewed 174 times
- LiuToki
- Posts: 6
- Joined: Sat Jun 05, 2021 11:04 pm
Re: I connect battery to ItsyBitsy nRF52840 but not working.
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.
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
-
- WTF, the VBAT diode is not mounted!
- image0.jpg (271.45 KiB) Viewed 174 times
Please be positive and constructive with your questions and comments.