bigarth
Posts: 3
Joined: Thu Aug 31, 2017 6:15 pm

Raspberry Pi B ACT LED wont' stay lit

Thu Aug 31, 2017 6:19 pm

Hi there.

I'm currently working my way through the tutorials here, with my Raspberry Pi B: http://www.cl.cam.ac.uk/projects/raspbe ... /ok01.html

I am able to get the ACT LED to light, however after lighting up it flickers rapidly and gets dimmer over the course of about a second, then turns off completely.

Is it possible the LED is damaged? Has anyone heard of this before? I haven't been able to find any posts with a similar issue.

klricks
Posts: 4694
Joined: Sat Jan 12, 2013 3:01 am
Location: Grants Pass, OR, USA
Contact: Website

Re: Raspberry Pi B ACT LED wont' stay lit

Fri Sep 01, 2017 3:24 am

bigarth wrote:
Thu Aug 31, 2017 6:19 pm
Hi there.

I'm currently working my way through the tutorials here, with my Raspberry Pi B: http://www.cl.cam.ac.uk/projects/raspbe ... /ok01.html

I am able to get the ACT LED to light, however after lighting up it flickers rapidly and gets dimmer over the course of about a second, then turns off completely.

Is it possible the LED is damaged? Has anyone heard of this before? I haven't been able to find any posts with a similar issue.
The tutorial is very old and refers to the original RPi 1B.
Which RPi B model do you have?
Controlling the LED's on later RPi's 2B and 3B is very different.
The commands in this link work on my RPi 3B: https://gist.github.com/taktran/1b691c08216dd30b70bf
Go here for my RPi writeup. Basic config, Serial Port add-on etc:
http://blackeagle12.net/Comp/RPi/Rpi.html Click contact icon then world icon --->

B.Goode
Posts: 4180
Joined: Mon Sep 01, 2014 4:03 pm
Location: UK

Re: Raspberry Pi B ACT LED wont' stay lit

Fri Sep 01, 2017 7:18 am

I am able to get the ACT LED to light, however after lighting up it flickers rapidly and gets dimmer over the course of about a second, then turns off completely.

Is it possible the LED is damaged?
As a quick test of the hardware, a spare microSD card containing a copy of Raspbian lite or the NOOBS-lite Installer would allow you to check the behaviour of the LEDs.

LdB
Posts: 520
Joined: Wed Dec 07, 2016 2:29 pm

Re: Raspberry Pi B ACT LED wont' stay lit

Fri Sep 01, 2017 7:40 am

If you want to check it baremetal I also have a pre-built copy .. I think David does as well
https://github.com/LdB-ECM/Raspberry-Pi ... /myBlinker

Put the files from the "firmware" directory on your SD card and run, works for every version of Pi.

bigarth
Posts: 3
Joined: Thu Aug 31, 2017 6:15 pm

Re: Raspberry Pi B ACT LED wont' stay lit

Fri Sep 01, 2017 4:14 pm

Thank you all for the replies. I am using an RPi 1B, so I believe the tutorial is appropriate.
If you want to check it baremetal I also have a pre-built copy .. I think David does as well
https://github.com/LdB-ECM/Raspberry-Pi ... /myBlinker
I will give this a try tonight and post the results.

bigarth
Posts: 3
Joined: Thu Aug 31, 2017 6:15 pm

Re: Raspberry Pi B ACT LED wont' stay lit

Sat Sep 02, 2017 4:05 pm

@LdB

Your repository succeeds in blinking the light of my RPi 1B. I'll have to figure out why my assembly instructions aren't working properly.

I appreciate your help.

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