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by jbeale
Fri Jul 19, 2019 11:26 pm
Forum: General discussion
Topic: I NEED HELP TO FIND A SENSOR THAT MEASURES OXYGEN
Replies: 5
Views: 174

Re: I NEED HELP TO FIND A SENSOR THAT MEASURES OXYGEN

I have seen some VOC (volatile organic compound) or hydrocarbon sensors for a little bit less, but oxygen sensors are generally more expensive. Many applications of oxygen sensors are in automobile engine systems to get fuel/air mixtures right, and the design may assume the sensor is at some high te...
by jbeale
Fri Jul 19, 2019 3:47 am
Forum: Gaming
Topic: roblox
Replies: 17
Views: 8410

Re: roblox

For what it's worth: apparently can run on Windows 7 or later, Mac 10.7 or later, Android, Chrome OS, but not Linux per se.
https://roblox.fandom.com/wiki/Minimum_ ... quirements
by jbeale
Fri Jul 19, 2019 3:33 am
Forum: Troubleshooting
Topic: Dead due to overheat?
Replies: 1
Views: 122

Re: Dead due to overheat?

Interesting problem! I fried a few Pi boards from overvoltage (accidentally using +12V instead of +5V !) and a USB port from water damage (outdoor experiment and lawn sprinklers got it) but I have never heard a buzz from a board. I think the components near the USB power input are a switching power ...
by jbeale
Thu Jul 18, 2019 5:40 am
Forum: Off topic discussion
Topic: 1TB microSD Card is real!
Replies: 16
Views: 457

Re: 1TB microSD Card is real!

Amazon is quoting me $428.94 for the Sandisk 1 TB.
https://www.amazon.com/SanDisk-Extreme- ... 07P9W5HJV/

maybe, if you really need it for the size. The same storage in USB3 SSD is 1/2 price and HDD at 1/10 the price.
by jbeale
Thu Jul 18, 2019 12:24 am
Forum: Troubleshooting
Topic: [Solved] New Raspberry 4b 4g dead upon arrival
Replies: 17
Views: 708

Re: [Solved] New Raspberry 4b 4g dead upon arrival

sounds like it is working now, if so congratulations! I am no expert but I had the impression that the new Buster release includes a different process for parsing the EDID information coming from the monitor that describes what video timings, resolution, color, etc. attributes the monitor is prepare...
by jbeale
Wed Jul 17, 2019 2:51 pm
Forum: General discussion
Topic: When are people in the U.S. getting their Pi 4s?
Replies: 108
Views: 4035

Re: When are people in the U.S. getting their Pi 4s?

the problem is, i don't have any available monitors... i kind of forgot that need when placing the order. :lol: Any Pi will run fine without a monitor. Assuming you have some other computer system, you can use a remote desktop setup to view what the Pi would show on its own screen, but remotely on ...
by jbeale
Wed Jul 17, 2019 2:25 pm
Forum: Troubleshooting
Topic: Is there a Pi 4 Undervoltage warning?
Replies: 5
Views: 275

Re: Is there a Pi 4 Undervoltage warning?

FWIW, the most the Pi 4 draws at idle without external USB devices, even with the original stock firmware and 4k enabled is 3720 mW according to https://www.martinrowan.co.uk/2019/07/raspberry-pi-4-power-temperature-at-idle/ and at 5V that is only 0.744 amps, which is a long way away from 3 amps. As...
by jbeale
Wed Jul 17, 2019 5:24 am
Forum: Beginners
Topic: Timed loop?
Replies: 25
Views: 470

Re: Timed loop?

It is certainly possible to run a program for <x> seconds and then stop and/or take some other action. I could give an example if you want but I'd need to know what language you are using- Bash shell script, Python, C/C++ or something else?
by jbeale
Wed Jul 17, 2019 4:09 am
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Just tried a fresh install, disappointing...
Replies: 10
Views: 301

Re: Just tried a fresh install, disappointing...

Is there one standard for how hotspot authentication is done? It's been my experience there are a wide variety of different mechanisms to accomplish this, and my various devices (Android phones and tablets) work well with some, but not with others. So I'm not sure this is just a Raspbian thing.
by jbeale
Tue Jul 16, 2019 6:43 pm
Forum: Raspbian
Topic: FreeCAD on PI4 and Raspbian Buster.
Replies: 35
Views: 1391

Re: FreeCAD on PI4 and Raspbian Buster.

Is this relevant to the issue?
FreeCAD crashes on creating a new document or opening a file
https://www.freecadweb.org/wiki/FAQ#Fre ... ing_a_file
by jbeale
Tue Jul 16, 2019 6:20 pm
Forum: General discussion
Topic: New RPI 4 running Debian buster - hardly anything works
Replies: 9
Views: 551

Re: New RPI 4 running Debian buster - hardly anything works

I believe the FreeCAD bug tracker is here: https://www.freecadweb.org/tracker/my_view_page.php see also: https://forum.freecadweb.org/viewtopic.php?f=3&t=5236 for tips on where additional diagnostic information appears in Report View, Python Console windows and log files. I also notice this: https:/...
by jbeale
Tue Jul 16, 2019 4:24 pm
Forum: General discussion
Topic: New RPI 4 running Debian buster - hardly anything works
Replies: 9
Views: 551

Re: New RPI 4 running Debian buster - hardly anything works

The hardware (RPi4) was released June 24 and came with a Raspbian based on pre-release Buster which was officially released July 6 so we are now 10 days into that cycle. There have been significant changes to graphics hardware in the Pi4, and I believe also graphics-related architecture in Buster. I...
by jbeale
Mon Jul 15, 2019 6:29 am
Forum: General discussion
Topic: Hardware Encoder in Raspberry pi 4B
Replies: 7
Views: 416

Re: Hardware Encoder in Raspberry pi 4B

I am probably not the best person to help you with that rather involved pipeline of commands because I don't even understand what it is doing. I might guess you are trying to encode 1920x1080/30 and save to a file and then at the same time, also encode 256x144/30 and stream via UDP? All I know is th...
by jbeale
Mon Jul 15, 2019 5:48 am
Forum: General discussion
Topic: Simple Infra-Red record/playback
Replies: 55
Views: 9121

Re: Simple Infra-Red record/playback

As far as sending the signal three times, it turns out that some kinds of lighting, eg. LEDs with PWM dimming, compact fluorescent and maybe gas-discharge lights, can have high frequency noise that may have a frequency similar to a valid IR code, in addition to other nearby IR controls for other dev...
by jbeale
Mon Jul 15, 2019 5:37 am
Forum: General discussion
Topic: Hardware Encoder in Raspberry pi 4B
Replies: 7
Views: 416

Re: Hardware Encoder in Raspberry pi 4B

If you are using the official Raspberry Pi camera, the raspivid application does hardware encode to H.264 on all previous models of Pi, and I presume continues to do so on the Pi 4. https://www.raspberrypi.org/documentation/usage/camera/raspicam/raspivid.md If you want to transcode some other video ...
by jbeale
Mon Jul 15, 2019 3:25 am
Forum: General discussion
Topic: Pi 4 PCB Defect? (fiberglass thread loose)
Replies: 15
Views: 958

Re: Pi 4 PCB Defect?

If you're talking about 0:47 I see along the top edge what may be a sliver of FR4 or whatever PCB board material they are using, I would assume due to a slightly rough cut when they separated that specific board from the larger panel during manufacturing. When you layout a board you have to follow d...
by jbeale
Sun Jul 14, 2019 5:24 am
Forum: Troubleshooting
Topic: Raspberry pi 4 is injecting noise into audio circuit
Replies: 3
Views: 132

Re: Raspberry pi 4 is injecting noise into audio circuit

I'm not sure I would say the Pi4 is injecting noise. Unless the noise is actually on the digital bitstream (which it isn't, if the volume doesn't affect it), the Pi cannot be the source of it all by itself, which the experiment with the HDMI cable confirmed. I would say you have an analog voltage no...
by jbeale
Sun Jul 14, 2019 1:50 am
Forum: General discussion
Topic: Want to measure battery volts
Replies: 30
Views: 969

Re: Want to measure battery volts

If you are not comfortable with electronic design, I do not recommend working with +48V from a high-current source (anything strong enough to run a refrigerator probably qualifies). Accidentally shorting out a power supply like that could be rather spectacular in a not-so-good way. It may seem too b...
by jbeale
Sat Jul 13, 2019 2:35 pm
Forum: General discussion
Topic: ffmpeg to record 30 FPS video from 2M camera
Replies: 2
Views: 110

Re: ffmpeg to record 30 FPS video from 2M camera

You don't mention which version of the Pi you have (Original Pi, Pi2, Pi3, Pi4)? Any of them are capable of handling the raw data rate of a compressed 1080p mp4 video just as a file transfer, but I believe that actually encoding such a video in real time at 30 fps requires the GPU hardware. At least...
by jbeale
Sat Jul 13, 2019 3:54 am
Forum: General discussion
Topic: Pi 4 heat sinks
Replies: 21
Views: 1408

Re: Pi 4 heat sinks

The purpose of a heatsink compound is to fill in small gaps, such as between the SoC and the HS. If you've got two bare metal surfaces, they will not be in good physical and thermal contact (unless they are optically flat) without something to fill in around the tiny bumps from surface roughness, li...
by jbeale
Wed Jul 10, 2019 10:19 pm
Forum: Beginners
Topic: Is it a true ground?
Replies: 5
Views: 200

Re: Is it a true ground?

I would be willing to bet all the RPi boards use a single shared ground net. HOWEVER, between any two points on the circuit board that are nominally "ground" there is a finite, non-zero resistance. If you pass significant current through any part of the R-Pi board, you are responsible for the local ...
by jbeale
Wed Jul 10, 2019 5:21 pm
Forum: Camera board
Topic: Record video stream continuously / autoremoving the oldest ones
Replies: 4
Views: 205

Re: Record video stream continuously / autoremoving the oldest ones

One more thought: "BlueCherry" is a complete Linux DVR solution and includes exactly the functions you describe, among others. I have used it for 24/7 video recording and it works fine, BUT I have not tried to run it on a Raspberry Pi, or with the Pi camera. I believe the typical use case takes vide...
by jbeale
Wed Jul 10, 2019 5:07 pm
Forum: Camera board
Topic: Record video stream continuously / autoremoving the oldest ones
Replies: 4
Views: 205

Re: Record video stream continuously / autoremoving the oldest ones

PiKrellCam does this with motion-triggered video. https://billw2.github.io/pikrellcam/pikrellcam.html It also has a mode to do time-lapse, and manually triggered recording. It is pretty configurable and can probably do continuous video segments too, although I haven't tried that. It also has a scrip...
by jbeale
Wed Jul 10, 2019 5:41 am
Forum: For sale
Topic: Raspberry Pi 4B in USA
Replies: 28
Views: 1390

Re: Raspberry Pi 4B in USA

the us power supply is the hotter item to get , with out it your new pi4 will not work properly as it has a usb-c special circuit. To clarify: current Pi4 boards do not work with so-called "e-marked" USB-C cables (eg. Apple cables), but it does work with at least some other USB-C cables, and USB-C ...
by jbeale
Mon Jul 08, 2019 11:28 pm
Forum: Advanced users
Topic: RaspberryPi 4: heatsink or fan
Replies: 34
Views: 6280

Re: RaspberryPi 4: heatsink or fan

Personally I like the fanless solution for what I suspect is better long-term reliability, when I'm putting Pi boards into possibly dusty places that are hard to get to.
Vault-Mess1.jpg
underground pi
Vault-Mess1.jpg (55.56 KiB) Viewed 400 times

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