|
sb hermit posted:I know this isn’t amazon but if you’re lucky and you live near a Microcenter, they have cheaper boxes of a variety of parts that might work well for hobbyists, including components such as pir sensors, temperature sensors, resistors, capacitors, diodes, and so on. coconono posted:+1 for Microcenter. They’re like big box RadioShacks(RIP). I wish…I live near Memphis, so the closest two MCs near me are 255/294 mile drives. I wish they shipped because of their PC parts & components.
|
#
?
Apr 15, 2024 17:42
|
|
|
|
| # ? Apr 24, 2024 05:30 |
|
|
Agree. I had a mission critical part fail and the local store didn’t have it but the one near my home office did. 
|
|
#
?
Apr 15, 2024 18:02
|
|
|
Hadn't thought about it in some time, but has anybody ever developed a good way to reboot a headless rpi? Mine might be crashed, but I had setup a script to reboot it if the network connection crashed. Now I am trying to remember what timeout I had set, before deciding whether to power-cycle it by pulling the plug. And have there been any new developments on how to get a monitor and keyboard attached, except for a ludicrously priced wireless kvm. VictualSquid fucked around with this message at 20:57 on Apr 15, 2024 |
|
#
?
Apr 15, 2024 20:53
|
|
|
VictualSquid posted:Hadn't thought about it in some time, but has anybody ever developed a good way to reboot a headless rpi? Buy another pi and a pikvm kit and attach it to your other headless pi lol
|
|
#
?
Apr 15, 2024 21:01
|
|
|
You can jump two of the GPIO pins to force a shutdown/boot of a pi, defaults to pins 5 and 6 but it can be reconfigured in config.txt. Or do it neatly and solder a button to those pins so you can shutdown the pi whenever you want. https://raspberrypi.stackexchange.com/questions/77905/raspberry-pi-3-model-b-dtoverlay-gpio-shutdown/77918#77918 I'm not completely clear what this does if the system is hard locked though. A hard reset can be done by messing with the global_en pin.. never done it, no advice on it. But it's out there.
|
|
#
?
Apr 15, 2024 21:21
|
|
|
SamDabbers posted:Buy another pi and a pikvm kit and attach it to your other headless pi lol That's a good idea, but then you want another one in case that one locks up. Some kind of PiKVM pi rebooter. I think with a few hundred bucks in Pis we can solve this problem.
|
|
#
?
Apr 15, 2024 22:04
|
|
|
Is there some simple circuit you could hook up to the GPIO pins to implement a watchdog? Like maybe a countdown timer that gets reset with a GPIO toggle, but if not reset, shorts the reboot pins? The idea is you write a 1 to a pin every 20ms or whatever, and if the watchdog goes 400ms (or whatever) without a reset, then it turns a pin high to reset the main computer.
|
|
#
?
Apr 15, 2024 22:07
|
|
|
Rexxed posted:That's a good idea, but then you want another one in case that one locks up. Some kind of PiKVM pi rebooter. I think with a few hundred bucks in Pis we can solve this problem. It's pis all the way down. But maybe you're onto something here. What if the first headless pi is wired up to reboot the pikvm pi rebooter pi like some sort of piroboros eating its tail?
|
|
#
?
Apr 16, 2024 02:47
|
|
|
VictualSquid posted:Hadn't thought about it in some time, but has anybody ever developed a good way to reboot a headless rpi? You can try looking into using a hardware watchdog which should come with most rpis. The nice thing about the watchdog is that it reacts when there is no activity. As in, if no one checks in with the watchdog, the watchdog reboots the machine. This works better than a process that reboots if it doesn’t detect a connection, since there is no recourse if the process crashes or otherwise is unresponsive (save for rebooting manually).
|
|
#
?
Apr 16, 2024 06:33
|
|
|
sb hermit posted:You can try looking into using a hardware watchdog which should come with most rpis. Oh is there one already built-in to the hardware? LOL, nevermind my previous post, then.
|
|
#
?
Apr 16, 2024 18:46
|
|
|
sb hermit posted:I know this isn’t amazon but if you’re lucky and you live near a Microcenter, they have cheaper boxes of a variety of parts that might work well for hobbyists, including components such as pir sensors, temperature sensors, resistors, capacitors, diodes, and so on. Do they now? What is it called/listed under? We have one opening next month and that’s a good excuse as any.
|
|
#
?
Apr 18, 2024 23:17
|
|
|
Warbird posted:Do they now? What is it called/listed under? We have one opening next month and that’s a good excuse as any. Depends on what you need, but they have variety packs of various things electrolytic capacitors https://www.microcenter.com/product/632685/inland-047uf-1000uf-electrolytic-capacitors-assortment-kit-13-values-200-pcs ceramic capacitors https://www.microcenter.com/product...-values-550-pcs resistors https://www.microcenter.com/product/618897/inland-1-4-watt-1-resistors-480-pack also diodes, breadboards, and they usually have raspberry pi in stock
|
|
#
?
Apr 18, 2024 23:57
|
|
|
sb hermit posted:also diodes, breadboards, and they usually have raspberry pi in stock I'll stick with my Raspberry Pi's tyvm 
|
|
#
?
Apr 20, 2024 19:34
|
|
|
eightysixed posted:my Raspberry Pi's tyvm Your Raspberry Pi's what?
|
|
#
?
Apr 22, 2024 12:17
|
|
|
One Legged Ninja posted:Your Raspberry Pi's what? I saw that coming a mile away, but didn’t feel like editing  But to answer your question - “working”
|
|
#
?
Apr 22, 2024 12:38
|
|
|
cruft posted:Oh is there one already built-in to the hardware? LOL, nevermind my previous post, then. whoa this is awesome! https://diode.io/blog/running-forever-with-the-raspberry-pi-hardware-watchdog
|
|
#
?
Apr 22, 2024 14:28
|
|
|
I put Raspberry Pi OS on my x86_64 Intel laptop from ~2011ish. It’s got a 128Gb SATA SSD, and 8Gb of RAM, that had been used as a ghetto NAS with a few Tb of old spinner-platter HDDs connected via SATA>>USB cables stacked on my dad’s old piano. It had been running the free version of TrueNAS Core. Now it’s a simple Pi-Hole, from the downloads and instructions from pi-hole.net. Since that was all the laptop was going to be used for (plus 60Gb of old ripped CD mp3s and a backup of my Kindle/ePub collection), I just used the curl | bash script directly from the official website…I think I had the whole thing up and running in less than 10 minutes. Now I can use my surplus-from-my-BiLaw Pi 0w and Arduino nano(s) to make an oscilloscope for a fun project as I break out my multimeter and soldering iron. I’m brushing up on basic electronics from an online learning platform, and I’m having the time of my life working and (re)learning . I have an old 1st gen 15” square flat panel Sony monitor (still has a VGA connection as the only interface) that I’m thinking of using for the future oscilloscope screen. I do have an HDMI>>VGA cord, and I know the Pi 0w has a (mini?)HDMI out. Hopefully I can find some components knocking around various drawers/online ordering to make the thing work, as there are Instructables and official blogs doing just that! I didn’t really have any reason for posting other than being excited about future projects and drinking a cappuccino at 11:30 on a Monday night  . I might X-post this in the general Linux thread, because I’m still definitely a n00b enough with the Pi/PiOS ecosystem that I’m sure I’ll have a bunch of questions as I go. My hope is that I can get beyond simply “following a recipe”-type work and actually understand what I’m doing as I go along.
|
|
#
?
Apr 23, 2024 05:44
|
|
|
DerekSmartymans posted:I put Raspberry Pi OS on my x86_64 Intel laptop from ~2011ish. It’s got a 128Gb SATA SSD, and 8Gb of RAM, that had been used as a ghetto NAS with a few Tb of old spinner-platter HDDs connected via SATA>>USB cables stacked on my dad’s old piano. It had been running the free version of TrueNAS Core. Sounds like fun! I’d love to hear more about it in this thread when you make progress. It hasn’t ever really occurred to me that arduinos and rpi devices could be repurposed into an oscilloscope… I should probably look into that, particularly because of the pio capabilities of the pi nano.
|
|
#
?
Apr 23, 2024 05:57
|
|
|
sb hermit posted:Sounds like fun! I’d love to hear more about it in this thread when you make progress. Yeah, preliminary “research” (read: looking at websites  ) says that both Pi’s and Arduinos can do it, but because of the signaling lag they can’t poll a lot of Hz. They won’t replace a good cheap-to-expensive model and function generator, but they will def do it at a basic level. I also saw this:  
|
|
#
?
Apr 23, 2024 06:35
|
|
|
That’s pretty cool. I still have a couple of old crts in some equipment that’s was used to tune NTSC video signals (I can’t remember the exact name of the instruments right now). I had wanted to repurpose the crts into clocks or just have them draw stuff in x-y mode. But they’re just sitting there at the moment and I’m not sure I’ll have the time anytime soon. Question for the thread: I won a replacement lcd screen for a LG VK810 tablet… it was a dollar and came with tools for the replacement which made it worth it just for that. But I’m wondering how hard it would be to interface with the screen via a pi? I know the correct answer is to find/read the datasheet for the screen and go from there, but I figured I’d ask if anyone has any idea whether these things usually use I2C or some other standard interface? Barring that, any good resources to find a datasheet for this thing? Good luck on your project man!
|
|
#
?
Apr 23, 2024 08:15
|
|
|
Don’t have microcenter here but digikey.com is my go to for electronic parts. I think they have student kits etc too, they have just an unbelievable amount of stuff. And their shipping is so fast it honestly blows my mind sometimes.
|
|
#
?
Apr 23, 2024 08:28
|
|
|
DerekSmartymans posted:
|
|
#
?
Apr 23, 2024 08:58
|
|
|
The issue with digikey is their shipping fees are really high. You gotta make sure to order a bunch of stuff at once or you end up spending $15 on a couple resistors. Fine if you actually need a lot of stuff but if you're a hobbyist doing a small project it makes it frustrating to get a few things you need.
|
|
#
?
Apr 23, 2024 09:08
|
|
|
|
| # ? Apr 24, 2024 05:30 |
|
|
plus it took me two clicks to find crypto mining scam stuff.
|
|
#
?
Apr 23, 2024 16:25
|
|