Go to advanced search

by geerlingguy
Tue Jul 23, 2019 4:20 pm
Forum: HATs and other add-ons
Topic: PoE hat, Raspberry Pi 4, not able to power off
Replies: 59
Views: 6894

Re: PoE hat, Raspberry Pi 4, not able to power off

I formatted a spare microSD card as FAT32 using diskutil on my Mac: diskutil eraseDisk FAT32 RASPBIAN MBRFormat disk2 Then I copied the contents of the Zip file linked above to it, and put it in a powered-off Pi with the PoE HAT. After about 1 second the green LED on the front was blinking rapidly, ...
by geerlingguy
Mon Jul 08, 2019 6:54 pm
Forum: HATs and other add-ons
Topic: PoE hat, Raspberry Pi 4, not able to power off
Replies: 59
Views: 6894

Re: PoE hat, Raspberry Pi 4, not able to power off

I should also add, this happens on all four of my 2GB Pi 4s (have not tried with my 1GB Pi 4 yet). 2 were purchased a week ago at Micro Center, and two came from separate orders from CanaKit. One of the Pis still had a couple little hardware clip things over the camera connector. I’m guessing they a...
by geerlingguy
Sat Jul 06, 2019 3:35 pm
Forum: HATs and other add-ons
Topic: PoE hat, Raspberry Pi 4, not able to power off
Replies: 59
Views: 6894

Re: PoE hat, Raspberry Pi 4, not able to power off

I'm encountering the same issue with Raspberry Pi 4 model B 2 GB with the official PoE HAT v2. It happens on all four Pis in my bramble, and I can watch them all shut down, stay off for maybe 1-2 seconds, then they all light up as if I had run: reboot instead of: shutdown -h now Downstream issue her...
by geerlingguy
Mon Jun 12, 2017 5:55 pm
Forum: Graphics, sound and multimedia
Topic: Blurry pictures with Camera Module v2?
Replies: 1
Views: 1179

Re: Blurry pictures with Camera Module v2?

The first v2 camera module seems to have been focused at some close range (e.g. 2 or 3 meters), not infinity like the v1 camera or the v2.1 camera. See: http://elinux.org/Rpi_Camera_Module#Adjusting_Lens_Focus To get a different focus (e.g. to get it to focus on infinity, so you can do things like t...
by geerlingguy
Wed Mar 16, 2016 8:38 pm
Forum: General discussion
Topic: Raspberry Pi 3 microSD card overclock
Replies: 15
Views: 30675

Re: Raspberry Pi 3 microSD card overclock

In my experience adding "dtoverlay=sdhost,overclock_50=100" stops the wifi adapter on an rpi3 from working. Instead use "dtoverlay=sdtweak,overclock_50=100", assuming you have sdtweak in overlays. I had to copy it over from my openelec image. Hmm, sounds like the issue that's been reported here, th...
by geerlingguy
Wed Mar 16, 2016 8:08 pm
Forum: General discussion
Topic: Raspberry Pi 3 microSD card overclock
Replies: 15
Views: 30675

Re: Raspberry Pi 3 microSD card overclock

Just checked and sdhost-overlay.dtb *is* included in the latest Jessie Lite image (2016-02-26)... rpi-update is not installed by default anymore I'm cloning from 2016-02-26-raspbian-jessie-lite.img, which I downloaded from https://www.raspberrypi.org/downloads/raspbian/, and the sdhost-overlay.dtb ...
by geerlingguy
Wed Mar 16, 2016 7:30 pm
Forum: General discussion
Topic: Raspberry Pi Zero vs Pi A+
Replies: 40
Views: 7642

Re: Raspberry Pi Zero vs Pi A+

Adding to this ordering Orange Pi is very easy.
Be cautious in your optimism when it comes to clones; so far my few experiences with similar clone boards has been annoying at best: http://www.jeffgeerling.com/blog/2016/o ... mpressions
by geerlingguy
Wed Mar 16, 2016 7:27 pm
Forum: General discussion
Topic: Raspberry Pi 3 microSD card overclock
Replies: 15
Views: 30675

Re: Raspberry Pi 3 microSD card overclock

Just adding... dtoverlay=sdhost,overclock_50=100 ...to config.txt should work fine in a standard Raspbian Jessie install without having to do anything else. On my Pi 3 with Raspbian Lite (even after apt-get upgrade), I had to download the .dtb... I'm wondering if on regular Raspbian it gets placed ...
by geerlingguy
Wed Mar 16, 2016 7:13 pm
Forum: General discussion
Topic: Raspberry Pi 3 microSD card overclock
Replies: 15
Views: 30675

Raspberry Pi 3 microSD card overclock

I just wanted to post some test results here, since the only topics I've found dealing with microSD card overclocking seemed to be a bit scattered about, and there were no simple "step 1, step 2, step 3" guides to testing and benchmarking microSD performance on the Pi 2/Pi 3. tl;dr: I finally receiv...
by geerlingguy
Tue Mar 15, 2016 5:35 pm
Forum: Troubleshooting
Topic: [RPi3] SSH not working via wifi
Replies: 155
Views: 100616

Re: [RPi3] SSH not working via wifi

Gah! You're absolutely correct, and I did read that post, just got confused :)

That makes sense, because the exact same behavior results from not disabling power management on Tenda/Edimax/etc. USB WiFi adapters. Thanks!
by geerlingguy
Tue Mar 15, 2016 4:51 pm
Forum: Troubleshooting
Topic: [RPi3] SSH not working via wifi
Replies: 155
Views: 100616

Re: [RPi3] SSH not working via wifi

Just adding another bit of input here ('me too'): Apple AirPort Extreme (6th gen, A1521, latest firmware) Strong WiFi signal Onboard Ethernet works (DHCP or static) for normal activity, and for SSH Onboard WiFi works (DCHP or static) for normal activity, and for SSH—however, when wired Ethernet is d...
by geerlingguy
Tue Dec 01, 2015 10:31 pm
Forum: General discussion
Topic: Raspberry Pi Zero power consumption
Replies: 49
Views: 91052

Re: Raspberry Pi Zero power consumption

So, just to give an update (and a mea culpa ): I retested everything with the PowerJive USB meter that just arrived today (it's much nicer in every way than the Charger Doctor), and now I'm getting results that jive (see what I did there?) with the others posted in this thread: USB keyboard, trackpa...
by geerlingguy
Mon Nov 30, 2015 3:44 pm
Forum: General discussion
Topic: Raspberry Pi Zero power consumption
Replies: 49
Views: 91052

Re: Raspberry Pi Zero power consumption

I've not managed to go below 66ma ... still nothing near Fluke-grade :-). Any cheap DMM will be an order of magnitude more accurate and precise than the USB tester; you just need to get it inline between power source and Pi. I only mention the Fluke because, after 30 years of cheaper meters, I fina...
by geerlingguy
Mon Nov 30, 2015 3:27 pm
Forum: General discussion
Topic: Raspberry Pi Zero power consumption
Replies: 49
Views: 91052

Re: Raspberry Pi Zero power consumption

A+ idle - ~200 mA B+ idle - ~240 mA model 2 B idle - ~420 mA Zero idle - ~65 mA My A+ and Zero idling measurements were exactly the same. 100 mA for both (@ 5.09V) I notice you used a very cheap USB charge doctor for your measurements. I wonder if it's a little "wonky" at the low end? I used a cali...
by geerlingguy
Mon Nov 30, 2015 3:25 pm
Forum: General discussion
Topic: Raspberry Pi Zero power consumption
Replies: 49
Views: 91052

Re: Raspberry Pi Zero power consumption

My arduino GEMMA2 uses 9mA on full blast. and how well does it play full HD video? :lol: At one frame every six minutes probably. I was messing with ' geerlingguy ' He was talking about low power. How about my digital watch. I haven't change the original battery for ten years. So how many pico amps...
by geerlingguy
Mon Nov 30, 2015 3:24 pm
Forum: General discussion
Topic: Raspberry Pi Zero power consumption
Replies: 49
Views: 91052

Re: Raspberry Pi Zero power consumption

I've not managed to go below 66ma [...] More usefully though I can get it down to 69ma with wifi dongle connected by sending usb to sleep for as long as needed. Thanks for posting your results (and to others too!); I did use a chintzy little USB 'Charger Doctor', and yes, it's highly likely to be i...
by geerlingguy
Mon Nov 30, 2015 4:21 am
Forum: General discussion
Topic: Raspberry Pi Zero power consumption
Replies: 49
Views: 91052

Re: Raspberry Pi Zero power consumption

It would work as a data logger, or could do a lot of small activities (not networked) via GPIO, a la Arduino. Granted, there are many other reasons a full Linux PC might not be suitable in those applications, but at least power is not going to be the main blocker for me anymore! For most of my proje...
by geerlingguy
Mon Nov 30, 2015 3:13 am
Forum: General discussion
Topic: Raspberry Pi Zero power consumption
Replies: 49
Views: 91052

Re: Raspberry Pi Zero power consumption

An update: I have been able to hit ~30 mA at idle by doing the following: Not have anything plugged into USB Run Raspbian Lite (official Jessie image) Disable HDMI (/usr/bin/tvservice -o, and put that in /etc/rc.local to make permanent) Disable the ACT LED (add lines from this post (http://www.midwe...
by geerlingguy
Mon Nov 30, 2015 3:12 am
Forum: Advanced users
Topic: Model A: How low can you go? (Power consumption)
Replies: 34
Views: 21619

Re: Model A: How low can you go? (Power consumption)

For anyone who might still come to this thread through some searches, the Pi Zero is the new low-power champ, and I have been able to bring it down to ~30 mA idle! Check out the results here: http://www.midwesternmac.com/blogs/jeff-geerling/raspberry-pi-zero-conserve-energy Basically, I had to: Not ...
by geerlingguy
Mon Nov 30, 2015 2:24 am
Forum: Advanced users
Topic: Disable ACT LED on Pi Zero
Replies: 4
Views: 7787

Re: Disable ACT LED on Pi Zero

dtparam=act_led_trigger=none dtparam=act_led_activelow=on This worked perfectly! I've updated the blog post linked in the first comment, and here are the commands to temporarily disable the LED (it's opposite, as you predicted): # Set the Pi Zero ACT LED trigger to 'none'. echo none | sudo tee /sys...
by geerlingguy
Sun Nov 29, 2015 3:46 am
Forum: Advanced users
Topic: Disable ACT LED on Pi Zero
Replies: 4
Views: 7787

Disable ACT LED on Pi Zero

I've tried controlling led0 and led1 on the Pi Zero (using the OS install of the official Raspbian Jessie Lite image, Nov/2015), and it seems none of the controls do anything for the single LED (labeled ACT) on the Pi Zero. I was using the instructions, basically, from this post: http://www.midweste...
by geerlingguy
Sat Nov 28, 2015 3:41 am
Forum: General discussion
Topic: Raspberry Pi Zero power consumption
Replies: 49
Views: 91052

Raspberry Pi Zero power consumption

I just did some testing, since I'm mostly interested in using the Pi Zero in applications where minimal power draw is essential (especially for battery-powered scenarios): http://www.midwesternmac.com/blogs/jeff-geerling/raspberry-pi-zero-power The gist of it: A+ idle - ~200 mA B+ idle - ~240 mA mod...
by geerlingguy
Sat Nov 28, 2015 3:37 am
Forum: General discussion
Topic: Raspbian Jessie Lite now available
Replies: 55
Views: 197273

Re: Raspbian Jessie Lite now available

This is awesome news—no longer do I have to preprocess the official Raspbian image with something like https://github.com/geerlingguy/diet-raspbian every time a new version comes out... I use one or two Pis with GUI/monitor here or there, but almost all my other Pis and Pi projects are headless, so ...
by geerlingguy
Mon Mar 16, 2015 4:47 am
Forum: General discussion
Topic: Reducing power consumption
Replies: 11
Views: 25451

Re: Reducing power consumption

At idle, the whole small cluster consumes about 28 mA/Pi (that's with the Pi 2). I will do some testing with my A+'s soon, but I'm pretty optimistic that the numbers there will be even lower. I would be extremely keen to read how you have achieved that low current consumption. I have been fighting ...
by geerlingguy
Thu Feb 26, 2015 4:11 pm
Forum: General discussion
Topic: gb nic?
Replies: 26
Views: 5093

Re: gb nic?

Like micronauts above, I was able to get more than double the internal NIC's bandwidth through a Gigabit USB adapter (I could get ~220 Mbps for some reason). Note that though you can get these raw speeds, any throughput will be further limited by the fact that all other I/O consumes some of that ava...

Go to advanced search