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by pfletch101
Fri Aug 30, 2019 10:32 pm
Forum: Device Tree
Topic: raspberry pi 4 gpio uart (ttyS0) not working like 3B+
Replies: 6
Views: 3130

Re: raspberry pi 4 gpio uart (ttyS0) not working like 3B+

It is now nearly September, and my 4B has been regularly updated/upgraded since I got it, earlier this month, but I am also seeing problems with serial transmission with a small beta HAT that uses UART0 and works perfectly on a 3. I don't have an oscilloscope or another serial terminal I can test it...
by pfletch101
Sun Aug 25, 2019 8:49 pm
Forum: General discussion
Topic: power supply raspberry pi 3 b+
Replies: 12
Views: 416

Re: power supply raspberry pi 3 b+

But then...I tend to nitpick the very common but badly used technical terms. To take one that shouldn't be a problem here, there is no such aircraft as an "Me-109". There was a "Bf-109" and an "Me-262", but no "Me-109" in spite of the Bf-109 having been designed by Willy Messerschmidt. My favorite ...
by pfletch101
Fri Aug 23, 2019 8:43 pm
Forum: Troubleshooting
Topic: Pi 4 Headless?
Replies: 10
Views: 547

Re: Pi 4 Headless?

See Andyroo's answer when I asked the same question ( https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=246667#p1506293 ). The added requirement for headless setup in Buster is that the default screen size has to be set for (at least) VNC to work. Both OS versions will autodetect most HDMI mon...
by pfletch101
Fri Aug 23, 2019 8:25 pm
Forum: General discussion
Topic: WiringPi Download (not for Raspbian)
Replies: 26
Views: 1240

Re: WiringPi Download (not for Raspbian)

Who actually reads documentation? I generally do that only once I discover my initial assumptions were false! ;) I always read through the entire documentation of a hardware device or software package once. I then generally reread the section(s) on whatever I actually plan to use. I find that enoug...
by pfletch101
Tue Aug 20, 2019 9:23 pm
Forum: General discussion
Topic: Getting sound when using VNC viewer on RPi4
Replies: 11
Views: 369

Re: Getting sound when using VNC viewer on RPi4

No, it is used on Windows, but I want to verify its functionality also on Linux. Therefore I have installed the dev stuff on the RPi4 and will transfer thw sources via SVN to it and then build and test the project there. Audio controls are part of the editor too. But it is not a full video editor, ...
by pfletch101
Fri Aug 16, 2019 1:05 am
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 558
Views: 157723

Re: Raspberry Pi 4 temperature

I'd say it was a regular case. Just a very well designed one. Looking at the one I have here, the LCD cable and camera cables have exits, and there is an available slot to get a GPIO ribbon cable out should you so wish. Indeed, there is a slot provided for a GPIO ribbon cable, but do you know of a ...
by pfletch101
Fri Aug 16, 2019 12:46 am
Forum: General discussion
Topic: Fan failure?
Replies: 15
Views: 750

Re: Fan failure?

You might want to just look into a Flirc case ($20 with shipping). The top half is all aluminium and acts as a big heat sink(no fan and none needed). For anything pre Pi4 they are more than enough case to keep it cool. For the Pi4 they are right on the edge, for moderate use they are fine. I endors...
by pfletch101
Thu Aug 15, 2019 3:15 am
Forum: Advanced users
Topic: Access to GPIO connector in a Flirc Case
Replies: 14
Views: 1847

Re: Access to GPIO connector in a Flirc Case

What about something like this https://www.mouser.com/ProductDetail/TE-Connectivity-AMP/3-87456-5?qs=sGAEpiMZZMs%252BGHln7q6pm7F1NlCFAzwfeva7z7Ehuec%3D Found by googling "2x20 2.54 female" You'd have to attach your own wires, but the connection itself is very slim. That looks like a ganged connecto...
by pfletch101
Wed Aug 14, 2019 7:48 pm
Forum: Advanced users
Topic: Access to GPIO connector in a Flirc Case
Replies: 14
Views: 1847

Re: Access to GPIO connector in a Flirc Case

There's a FAQ on the Flirc RPi 4 case page where question 9 specifically adresses the gpio ribbon cable issue: I'm having trouble fitting a standard IO Cable for the Connectors, do you have a recommendation? Yes, this one works perfectly fine: https://octopart.com/search?q=IDSD-20-D-06.00 I haven't...
by pfletch101
Tue Aug 13, 2019 5:46 pm
Forum: Troubleshooting
Topic: Pi 4 hangs on boot when 2 displays connected
Replies: 10
Views: 301

Re: Pi 4 hangs on boot when 2 displays connected

So to cut a long story short, if your Pi 4 hangs on boot when 2 displays are connected, try a different micro SD card. The cards are different brands, the cheaper of the two is the one that allows the dual displays to work. It seems highly improbable (but not impossible, I grant) that the make or s...
by pfletch101
Tue Aug 13, 2019 3:34 pm
Forum: Advanced users
Topic: Access to GPIO connector in a Flirc Case
Replies: 14
Views: 1847

Re: Access to GPIO connector in a Flirc Case

I confirm this on the RPi3B+ version of the FLIRC case (just took mine from storage to verify pfletch101's concern) in my measurement, the 40-pin ribbon connector's length is about 55.5mm (correct me on this), while the pillar to pillar widest distance is 53mm so definitely a 40-pin ribbon connecto...
by pfletch101
Mon Aug 12, 2019 11:39 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 558
Views: 157723

Re: Raspberry Pi 4 temperature

I'd say it was a regular case. Just a very well designed one. Looking at the one I have here, the LCD cable and camera cables have exits, and there is an available slot to get a GPIO ribbon cable out should you so wish. Indeed, there is a slot provided for a GPIO ribbon cable, but do you know of a ...
by pfletch101
Mon Aug 12, 2019 9:32 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 558
Views: 157723

Re: Raspberry Pi 4 temperature

I'd say it was a regular case. Just a very well designed one. Looking at the one I have here, the LCD cable and camera cables have exits, and there is an available slot to get a GPIO ribbon cable out should you so wish. Indeed, there is a slot provided for a GPIO ribbon cable, but do you know of a ...
by pfletch101
Mon Aug 12, 2019 8:34 pm
Forum: Other projects
Topic: Creating an heart attack detector
Replies: 14
Views: 1582

Re: Creating an heart attack detector

Not wanting to derail the discussion but this article maybe of interest even just to prove it is possible in some cases just to use the beat rate https://techlector.com/apple-watch-detects-heart-attack/ Maybe start with green led heartbeat sensors (search photoplethysmography) and go from there - a...
by pfletch101
Mon Aug 12, 2019 5:41 pm
Forum: Other projects
Topic: Creating an heart attack detector
Replies: 14
Views: 1582

Re: Creating an heart attack detector

Just as a matter of interest, while being tested for other things, I was asked to wear a 24-hour monitoring device. It appeared to record ... something ... during that 24 hours, from a couple of electrodes taped to my chest. Quite what they thought about my heart stopping for a couple of hours I do...
by pfletch101
Mon Aug 12, 2019 2:04 pm
Forum: Other projects
Topic: Creating an heart attack detector
Replies: 14
Views: 1582

Re: Creating an heart attack detector

or sit down and get ready. Though if you could do it through a small compact smart device people may wear... Probably not. For any degree of reliability in analyzing ECGs for ischemia, you need at least a limited array of electrodes across the chest - not just something worn or attached to a single...
by pfletch101
Sun Aug 11, 2019 9:08 pm
Forum: Other projects
Topic: Creating an heart attack detector
Replies: 14
Views: 1582

Re: Creating an heart attack detector

I wonder if there is possible to predict the heart attack a few seconds or maybe minutes in advance? There are reasonably specific ECG changes that indicate myocardial ischemia (marginal oxygen supply to the heart), which can be the forerunner of a 'heart attack' (usually caused by inadequate oxyge...
by pfletch101
Sun Aug 11, 2019 8:48 pm
Forum: Troubleshooting
Topic: RPi 2 has better connectivity than RPi4?
Replies: 15
Views: 1131

Re: RPi 2 has better connectivity than RPi4?

I bought a RPi4 on it's release day, I've performed all the updates and even the rpi-update to get the latest firmware release. I've been struggling with connectivity issues since day one and it's getting progressively worse. I edited the .conf file that switches the power management off for wlan0,...
by pfletch101
Sun Aug 11, 2019 8:38 pm
Forum: Beginners
Topic: Is it possible to power off a monitor when the RPi is powered off?
Replies: 13
Views: 414

Re: Is it possible to power off a monitor when the RPi is powered off?

Not without additional hardware. Additional hardware would be fine, I have plenty of room for additional hardware. I just need to be able to power it off and on with computer since the monitor will be enclosed in a case where I won't generally have access to the power button without opening up the ...
by pfletch101
Sun Aug 11, 2019 3:31 pm
Forum: Advanced users
Topic: Access to GPIO connector in a Flirc Case
Replies: 14
Views: 1847

Access to GPIO connector in a Flirc Case

I have my Pi 4b-4 in a Flirc Case, which solves the heating issue which the Pi 4 otherwise suffers from. However, at some time in the future, I will probably want access to the board's GPIO connections, and this is proving a bit challenging. The Flirc case has a narrow cutout in its base positioned ...
by pfletch101
Sat Aug 10, 2019 9:31 pm
Forum: General discussion
Topic: Pi 3 - Thermostat Wiring Issue
Replies: 19
Views: 620

Re: Pi 3 - Thermostat Wiring Issue

Actually, there IS a reason to expect all HVAC systems to be wired the same since it's an industry standard. And the skills required to wire up a thermostat IS considered to be part of a mere mortal's tool kit. Again, that may be a reasonable assumption in the USA. It is certainly NOT reasonable in...
by pfletch101
Sat Aug 10, 2019 5:18 pm
Forum: General discussion
Topic: When are people in the U.S. getting their Pi 4s?
Replies: 160
Views: 9063

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

Newark is Farnell who are one of the main manufacturers for RPi boards. Good luck removing preferred vendor status from them. If they are manufacturing them, you would think that they might have a better idea of when they would have them in stock! I cancelled my order (from June 29) a week or so ag...
by pfletch101
Fri Aug 09, 2019 11:55 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 temperature
Replies: 558
Views: 157723

Re: Raspberry Pi 4 temperature

I remember there were some plans to reduce (idle) power consumption with software changes to the DRAM controller or the graphics driver. Are we going to see anything in this regard any time soon? And what happened to the VLI firmware update, are there any further updates coming out? If you have any...
by pfletch101
Fri Aug 09, 2019 8:07 pm
Forum: General programming discussion
Topic: Code Help Please
Replies: 5
Views: 1291

Re: Code Help Please

If not, I normally put commands at the end of the file with one or more comment lines giving the reason why I have added the line(s). You may think you will remember what the line does BUT I do not and find comments handy (it’s a age thing :roll: ) I vote for the end (and for the comments :) ), too...
by pfletch101
Fri Aug 09, 2019 7:05 pm
Forum: General discussion
Topic: connection doens't return after router reboot
Replies: 9
Views: 335

Re: connection doens't return after router reboot

Hello , I have notice this problem on my pi: the pi is connected to a router and working when I reboot the pi - everything is ok , the connection return after the boot . when I reboot the router - I lose connection to the pi and I have to do a hard reset \ local reboot why is this ? how can I fix t...

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