nRF5832 - Deffective Board

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SaCha802
 
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nRF5832 - Deffective Board

Post by SaCha802 »

On 11/13/2022 I ordered an nRF5832 board and I didn't have any issues with it until today. I've been using my computer to power the board, however yesterday I received a 300mah battery that I was going to use for my project. The battery works just fine it powers the board (the red led is on), however, when I plug in a USB cable the charging led (orange led) stays off and the battery is not charging (I measured the voltage before and after charging it). Does this mean there is a problem with the charging circuit?
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mikeysklar
 
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Re: nRF5832 - Deffective Board

Post by mikeysklar »

The Feather will use USB power while supplied and only drain the battery when USB power is lost.

The battery will charge until full at 4.2v and then stop charging.

The behavior you are seeing sounds normal. Is there anything that is not working?

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SaCha802
 
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Re: nRF5832 - Deffective Board

Post by SaCha802 »

Charging is not working.
(I measured the voltage before and after charging it).
The voltage was the same around 3.9 V before and after charging and you said it should charge until full at 4.2V

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mikeysklar
 
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Re: nRF5832 - Deffective Board

Post by mikeysklar »

It could be an issue with the nRF52 lithium charger chip, the battery or just a standing voltage being high enough that is not charging.

I take it the battery is not from Adafruit?

Can you upload this blink program to run and let the battery drain a bit further below 3.7v? That would help to verify that it is the board that needs to be swapped.

Code: Select all

#if defined(USE_TINYUSB)
#include <Adafruit_TinyUSB.h> // for Serial
#endif

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}

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SaCha802
 
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Re: nRF5832 - Deffective Board

Post by SaCha802 »

After running it for quite some time the battery now reads 0V which makes sense because it has a protection circuit that disconnects it from the terminals to prevent a deep discharge.

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mikeysklar
 
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Re: nRF5832 - Deffective Board

Post by mikeysklar »

Same issue when you plug in the battery now? Does it not charge?

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SaCha802
 
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Re: nRF5832 - Deffective Board

Post by SaCha802 »

Unfortunately, the battery still reads 0V.

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mikeysklar
 
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Re: nRF5832 - Deffective Board

Post by mikeysklar »

Do you have another JST battery you can test with? This seems more likely an issue with the battery than the boards charging circuitry, but I cannot rule either out.

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SaCha802
 
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Re: nRF5832 - Deffective Board

Post by SaCha802 »

Unfortunately, I only have this battery. I left the battery charging (using nrf52) for a few hours and it only reads 2.9V now which is not even close to 3.7V. Also, I don't have any other device that I could use to charge this battery.
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mikeysklar
 
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Re: nRF5832 - Deffective Board

Post by mikeysklar »

The on board charger is 100mA so three hours of charging would be necessary for a full charge under normal conditions (starting at a drained value of 3.2v).

I'm willing to try a replacement board if you are convinced that the battery is good.

e-mail [email protected] for replacement and provide the order# and this forum link as authorization.

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