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Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.3V
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Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.3V

by olamatre on Wed Mar 25, 2020 11:18 am

I'm measuring 0V between any of the two 3.3V outputs and the ground-pin at my Adafruit Feather nRF52 Bluefruit LE while powering by micro-USB or battery. Have I burned the 3.3V-regulator or is it something I'm missing?

Edit: This script is not giving any voltage between pin 7 and 16 either:

Code: Select all | TOGGLE FULL SIZE
void setup() {
  pinMode(16, OUTPUT);
  pinMode(7, OUTPUT);
}

void loop() {
  digitalWrite(7, LOW);
  digitalWrite(16, LOW);
}


But I'm able to send data via Bluetooth.

olamatre
 
Posts: 9
Joined: Wed Mar 25, 2020 11:00 am

Re: Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.

by dastels on Wed Mar 25, 2020 1:12 pm

In your script, you're writing both pins 7 & 16 low so they should both be at 0v.

Do you get any activity on the board? Any LEDs light up? Can you communicate with it? Load sketches?

If the 3.3v regulator is burnt out the board will be completely dead.

Dave

dastels
 
Posts: 3400
Joined: Tue Oct 20, 2015 3:22 pm

Re: Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.

by olamatre on Wed Mar 25, 2020 1:27 pm

Thanks, for answer!

The board runs, upload sketches and communicate via Bluetooth. I'm measuring nothing at the 3.3V, but I'm measuring 4.2 at battery port. The internal LED also works using the blinking-script. What I just noticed is that I read a high value via digitalRead() on all the GPIO-pins, and I'm reading a value of <100 through analogRead at analog ports. I have tried several different scripts, but it's the same result.

Nothing lights up when the USB is connected when running an empty script, don't know if it's supposed to do that.

olamatre
 
Posts: 9
Joined: Wed Mar 25, 2020 11:00 am

Re: Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.

by dastels on Wed Mar 25, 2020 2:02 pm

Do you read a HIGH on digital pins that are connected to ground? Or are they unconnected?

Can you make a clear photo of the soldering of the headers? I am wondering if the issue with the 3v pins is how you are measuring and/or what you are connecting to for the measurement.

Dave

dastels
 
Posts: 3400
Joined: Tue Oct 20, 2015 3:22 pm

Re: Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.

by olamatre on Wed Mar 25, 2020 4:13 pm

Connected to ground, but I haven't soldered it yet. Just uses a breadboard. Here are a picture and code:

Code: Select all | TOGGLE FULL SIZE
void setup() {
  pinMode(27, INPUT);
  Serial.begin(9600)
}

void loop() {
  Serial.println(digitalRead(27));
  delay(200);
}


WiringAdafruit.png
WiringAdafruit.png (893.73 KiB) Viewed 70 times

olamatre
 
Posts: 9
Joined: Wed Mar 25, 2020 11:00 am

Re: Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.

by dastels on Wed Mar 25, 2020 8:30 pm

You mean you haven't soldered the headers in? All bets are off then. It's pretty much guaranteed that you don't have good connections between the board and the pins.

Dave

dastels
 
Posts: 3400
Joined: Tue Oct 20, 2015 3:22 pm

Re: Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.

by olamatre on Thu Mar 26, 2020 3:19 am

Thanks for advice! I'll try measuring directly without pins.

olamatre
 
Posts: 9
Joined: Wed Mar 25, 2020 11:00 am

Re: Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.

by olamatre on Thu Mar 26, 2020 3:21 am

That was it:P

olamatre
 
Posts: 9
Joined: Wed Mar 25, 2020 11:00 am

Re: Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.

by olamatre on Thu Mar 26, 2020 3:33 am

I'll put your nickname in our bachelor thesis thanking section, cause this has saved me a lot of time.

olamatre
 
Posts: 9
Joined: Wed Mar 25, 2020 11:00 am

Re: Adafruit Feather (nRF52 Bluefruit LE) measuring 0V at 3.

by dastels on Thu Mar 26, 2020 8:51 am

Glad it was just that.

Full speed ahead. Have fun.

Dave

dastels
 
Posts: 3400
Joined: Tue Oct 20, 2015 3:22 pm

Please be positive and constructive with your questions and comments.