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by mwrich4
Tue Mar 31, 2020 11:18 pm
Forum: Beginners
Topic: Little knowledge, just an idea, need a learning starting point
Replies: 5
Views: 292

Re: Little knowledge, just an idea, need a learning starting point

Truly erasing flash take TIME.

If this is a panic mode ability, I suppose it's technically viable with another small autonomous processor. But it's a LOT of design work as stated above.

Otherwise, most of us just insert and delete in a system.
by mwrich4
Tue Mar 31, 2020 11:13 pm
Forum: Graphics, sound and multimedia
Topic: Would it be possible to connect this sensor to a pi?
Replies: 4
Views: 251

Re: Would it be possible to connect this sensor to a pi?

Camera elements without an embedded controller are EXTREMELY fussy. Better to settle for something else that connects to the Pi if that's your desire.
by mwrich4
Tue Mar 31, 2020 11:06 pm
Forum: Troubleshooting
Topic: data read failed from five i2c senseros
Replies: 8
Views: 295

Re: data read failed from five i2c senseros

If you think the sensor is NOT broken then you have to verify with a scope or logic analyzer on the I2C conversation.

It's not fun, but definitive.
by mwrich4
Tue Mar 31, 2020 11:01 pm
Forum: Automation, sensing and robotics
Topic: Values in the ADC are fluctuating and incorrect.
Replies: 9
Views: 516

Re: Values in the ADC are fluctuating and incorrect.

I see external power to the ADC (I think). Consider ground loops. RasPi power should be fine for an ADC and ADCs are low-power.

Also, if there's any capcitance/resistance in the circuit RC issues may require you to select, hold and THEN sample.
by mwrich4
Tue Mar 31, 2020 4:58 am
Forum: Media centres
Topic: Raspberrypi 4 plex audio media player.
Replies: 9
Views: 1511

Re: Raspberrypi 4 plex audio media player.

As commented here: https://www.raspberrypi.org/forums/viewtopic.php?f=38&t=260413 , I've had good luck using a RasPi with a DAC HAT to stream iHeart 24/7. Volumio software has some other options, you might look in to that. It's based on MPD and their solution has fewer skips and noise than the iHear...
by mwrich4
Tue Mar 31, 2020 4:40 am
Forum: General discussion
Topic: Two stepper motor with A4988
Replies: 2
Views: 133

Re: Two stepper motor with A4988

it sounds like your supply can't give the RasPi what it needs when both motors run. Perhaps a reasonable capacitor might help if the batteries don't have a high peak current output. Single AA's seem to give about 4A in a short (20A range on multimeter) Make a little monitor circuit that flashes an L...
by mwrich4
Tue Mar 31, 2020 4:33 am
Forum: Troubleshooting
Topic: Raspberry pi 4 is injecting noise into audio circuit
Replies: 6
Views: 1074

Re: Raspberry pi 4 is injecting noise into audio circuit

I tried listening to streams on my cell phone through a 12v for speakers. Whenever the phone was also plugged in for charging I had a while. These are typical ground loop issues. You can reduce it a bit by using a series resistor for all signal paths including the shared ground. The output will be l...
by mwrich4
Tue Mar 31, 2020 4:23 am
Forum: Python
Topic: Servo motor sometimes struggles moving to right position
Replies: 5
Views: 324

Re: Servo motor sometimes struggles moving to right position

joan made a comment on other post that got me thinking. (I like the quadrature waveform avatar) Running in raspbian is not guaranteed real-time (it may find other things that need doing while you are trying some fine control with user code) Arduino for example, is nearly real-time code. When the req...
by mwrich4
Tue Mar 31, 2020 4:17 am
Forum: Troubleshooting
Topic: Two SD Cards lost writing ability less than a year
Replies: 2
Views: 143

Re: Two SD Cards lost writing ability less than a year

I believe things like Volumio use a virtual RAM drive for any swap and active data files. Periodically copying the files to the permanent storage. But the use case for Volumio is very little new data to catalog and store. ( mostly user preferences ) Flash memory has a limited amount of rewrites. You...
by mwrich4
Tue Mar 31, 2020 4:11 am
Forum: Python
Topic: Incremental encoder
Replies: 5
Views: 334

Re: Incremental encoder

Unless you implement the encoder count module as a system driver. You'll probably need a queue for the events since Raspian is not a bare metal RTOS with nothing else to do. Of course it sorta depends on rotation speed. Testing with a low-speed rotation should be ok. There is still the chance of +/-...
by mwrich4
Tue Mar 31, 2020 3:54 am
Forum: Media centres
Topic: Internet Radio Player
Replies: 7
Views: 1513

Re: Internet Radio Player

Look here https://www.raspberrypi.org/forums/view ... 8&t=260413

I commented about using Volumio on my pi for a 24/7 stream playback (except when source resets).
by mwrich4
Mon Mar 09, 2020 6:44 pm
Forum: Beginners
Topic: "Introducing Raspberry Pi Imager, our new imaging utility"
Replies: 108
Views: 7907

Re: "Introducing Raspberry Pi Imager, our new imaging utility"

Please update your imager from: https://www.raspberrypi.org/downloads/ A bug has been fixed and released this morning... Where is the version number ? PeterO Should be something along those lines in the next or next next release. "Imager.exe" Perhaps we could invest in a few digits after the name f...
by mwrich4
Mon Mar 09, 2020 6:37 pm
Forum: Beginners
Topic: "Introducing Raspberry Pi Imager, our new imaging utility"
Replies: 108
Views: 7907

Re: "Introducing Raspberry Pi Imager, our new imaging utility"

. . . but if you're running XP, you have bigger problems than that. 'https://support.microsoft.com/en-gb/help/14223/windows-xp-end-of-support' End of support is not a big deal for hobbyists. If it works USE it until it dies. I'm using Win7 which is the new XP. Why? because it doesn't change the use...
by mwrich4
Wed Feb 12, 2020 3:54 am
Forum: Beginners
Topic: Creating an Operating System on the Raspberry Pi
Replies: 36
Views: 2262

Re: Creating an Operating System on the Raspberry Pi

Hello. I received a Raspberry Pi 4 B+, and I was wondering if I could create my own operating system. Are there any good leads for me to follow to create an OS? It is best to have a wealth of experience from having used a variety of operating systems before creating your own. Studying FreeRTOS is t...
by mwrich4
Wed Feb 12, 2020 3:32 am
Forum: General discussion
Topic: Reasoning behind dual Micro HDMI, and potential future alternatives?
Replies: 125
Views: 12994

Re: Reasoning behind dual Micro HDMI, and potential future alternatives?

James, I think you should have a canned reply reiterating the mission statement of PI.ORG. My take is this: "They're building their best, cheapest, highly functional board for distribution to classrooms." As end-users, if our projects can piggy-back on the great pricing of their product, fantastic. ...
by mwrich4
Wed Feb 12, 2020 3:17 am
Forum: General discussion
Topic: Which 20" + touch monitors are known to work with Rpi's
Replies: 2
Views: 217

Re: Which 20" + touch monitors are known to work with Rpi's

Unless you test heavily, the responsiveness of a resistive screen will feel poor to a user in comparison to any modern phone for an end-user. Be sure to try one first. I didn't see a mention of the type you want to source, but if you are searching by the price, you'll most likely find resistive mode...
by mwrich4
Sat Jan 04, 2020 5:41 pm
Forum: Advanced users
Topic: Network (Ethernet) Boot for Pi4
Replies: 13
Views: 1994

Re: Network (Ethernet) Boot for Pi4

Thanks for the updates .. Yes I did see the discussion of beta support, it didn't seem like that thread discussion led to a discussion of a stable version. That was back in September. Searching for network boot or netboot, didn't show any more recent mentions. EDIT: the RPI Hardware Doc still says "...
by mwrich4
Sat Jan 04, 2020 5:33 pm
Forum: Advanced users
Topic: Network (Ethernet) Boot for Pi4
Replies: 13
Views: 1994

Re: Network (Ethernet) Boot for Pi4

Since this thread has had no updates, is it safe to assume Network (Ethernet) Boot for Pi4 is not available yet?
by mwrich4
Tue Dec 31, 2019 9:54 pm
Forum: Graphics, sound and multimedia
Topic: Looking To Build Internet Radio Stream Receiver
Replies: 19
Views: 3326

Re: Looking To Build Internet Radio Stream Receiver

( Volumio adding web radio stream to favorites ) Browse -> Web Radio -> My Web Radio (click the 3 dots to the right) -> +Add Web Radio The station play info is there, but it'll be not nicely formatted. It does show info and plays well. Except for stream resets, my server is up for months at a time. ...
by mwrich4
Tue Dec 31, 2019 8:42 pm
Forum: Graphics, sound and multimedia
Topic: Looking To Build Internet Radio Stream Receiver
Replies: 19
Views: 3326

Re: Looking To Build Internet Radio Stream Receiver

I found an article that pointed out the URL strings are in the page source for the iHeart web interface. Since I only like 1 station so far, I found these strings in the page source (Classic Rock) : https://c3.prod.playlists.ihrhls.com/4426/playlist.m3u8 https://c3icy.prod.playlists.ihrhls.com/4426_...
by mwrich4
Mon Dec 30, 2019 7:18 pm
Forum: Beginners
Topic: Why doesn't Raspbian have a Print utility?
Replies: 50
Views: 3521

Re: Why doesn't Raspbian have a Print utility?

I'm not aware of any Linux GUI print utilities, and yes, that does seem to be a big hole in the Linux ecosystem. Not sure what can be done about it, I'll have a word with the desktop guy in the new year, he may have something in mind, but the fact it's not been done might indicate it's actually qui...
by mwrich4
Mon Dec 30, 2019 7:05 pm
Forum: Graphics, sound and multimedia
Topic: Looking To Build Internet Radio Stream Receiver
Replies: 19
Views: 3326

Re: Looking To Build Internet Radio Stream Receiver

I've been using the free version of Volumio on my RPI3. It is very stable. I run it 24/7 to play my favorite iHeart streams into a Lepai Amp driving 12-inch 3-ways. All for less power than an incandescent night lamp (7W) Volumio also provides NAS services for any connected storage on that pi. My Win...
by mwrich4
Sun Oct 20, 2019 8:15 pm
Forum: General discussion
Topic: Pi 3 A +. What is it for?
Replies: 52
Views: 4176

Re: Pi 3 A +. What is it for?

System development is far more encompassing than just expecting a computer can do anything. You should always consider the workload and program mix when trying to use a low-cost system to do tasks. Pi 3A+ would be great for some turnkey solutions. Most devs use a full-power system for fast build, tr...
by mwrich4
Sun Oct 20, 2019 8:05 pm
Forum: General discussion
Topic: Raspi 4 file server disappointing transfer speed, degradation and segfaults
Replies: 50
Views: 5062

Re: Raspi 4 file server disappointing transfer speed, degradation and segfaults

Issues like this are commonly OS internal and shouldn't be blamed on hardware. Many vendors SELL versions of linux that are well tested so that these scaling issues are identified and fixed, BUT they retain the cure in their own variant because it costs quite a bit to make a solid, scalable OS. Free...
by mwrich4
Sun Sep 29, 2019 5:45 pm
Forum: Advanced users
Topic: Multiprocessing across 2 Pis
Replies: 7
Views: 668

Re: Multiprocessing across 2 Pis

Last time I did this it was on much less powerful hardware. Instead of thinking about a generalized processing solution such as clustering, I split my design down into an autonomous motor control module instructed by a more general-purpose system controller. This way, high use CPU consumers such as ...

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