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Old 09-17-2019, 11:22 AM   #271
kuddel
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Originally Posted by Urwumpe View Post
 Does anybody have an original SID chip around, BTW?
Sure, two actually! But they are not for sale
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Old 09-17-2019, 11:45 AM   #272
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Originally Posted by kuddel View Post
 Sure, two actually! But they are not for sale
I know, those with the proper design error are already so rare, that you can only inherit them.
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Old 09-17-2019, 12:00 PM   #273
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Oracle Shows 1060 Raspberry Pi 3 B+ supercomputer at OOW
https://www.servethehome.com/oracle-...mputer-at-oow/

Perhaps this is why they're out of stock?
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Old 09-26-2019, 09:05 AM   #274
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Handy little board if you are into pollution?

https://www.elektor.com/enviro-envir...eid=8fdcb4d06f
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Old 09-26-2019, 10:35 AM   #275
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Originally Posted by Notebook View Post
 Handy little board if you are into pollution?
You can put one in the bathroom and write the highscores to an online leaderboard?
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Old 09-26-2019, 10:47 AM   #276
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Well, I'm not sure if the gas-analyser does Methane...?

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You can implement Enviro+ in IoT applications as well. By connection it to Alexa you can get information about the temperature and humidity of the air by simply asking, or there's also an option to set up a trigger action with IFTTT that turns your Philips Hue lights on when the light level drops below a certain level etc.
So you could get a sound and light show if a guest exceeds set levels in the bathroom?

Last edited by Notebook; 09-26-2019 at 10:50 AM.
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Old 09-26-2019, 11:08 AM   #277
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If you add one of these: https://www.seeedstudio.com/Grove-Gas-Sensor-MQ2.html
you'll get LPG, i-butane, methane, alcohol, Hydrogen etc.

and one of these: https://www.seeedstudio.com/Grove-Ai...-3-p-2439.html
adds carbon monoxide, alcohol, acetone, thinner, formaldehyde and other slightly toxic gases.

So it can be done..
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Old 09-26-2019, 12:01 PM   #278
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Wow, you could do complete gaseous analysis of someone!
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Old 10-01-2019, 12:06 PM   #279
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I am looking for a way to control a Bluetooth Low Energy RGB LED bulb from a single board computer.

This article describes a method: https://medium.com/@urish/reverse-en...b-56580fcb7546

I bought a bulb (Eglo Crosslink), but the values I get are much more cryptic than in the tutorial. I can't recognize anything which looks like a color definition.

Anybody here on the forum who could help me hacking these bulbs?

Last edited by Marijn; 10-01-2019 at 01:19 PM. Reason: typo
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Old 10-11-2019, 07:00 PM   #280
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Germany is launching ESP32's (my new hobby) and Raspberry Pi Zero W's into space from Sweden to test high speed sensors and intensive computing tasks:



https://hackaday.com/2019/10/11/send...32-into-space/

Seems fun
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Old 10-27-2019, 03:50 PM   #281
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So, something more "Earthly" for now:

For a project the idea is to replace this array of separate and not-too-reliable timers



and so, after fiddling with Python, an RPi 3B and an Arduino UNO I keep around, here is a generic programmable timer relay controller (specifically, 8 relays with a maximum of 12 activations per day for now), controllable through a 3.5 inch resisitive touch display:



After some testing the idea is to use an Arduino Nano and eventually a Pi Zero to package everything decently in a more compact box.

Since this would be used without an internet connection, a thing I have to figure out how to do is how to attach a real-time clock without using the GPIO pins, currently used by the display.

Last edited by Fabri91; 10-27-2019 at 03:54 PM.
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Old 10-27-2019, 04:14 PM   #282
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Originally Posted by Fabri91 View Post
 Pi Zero
It might be a good idea to add a periodic reboot to crontab - in my experience these tend to lock up every few weeks for no apparent reason.
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Old 10-27-2019, 05:20 PM   #283
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Will take that into account, thanks!

Luckily the application would be checked in on daily and should it fail for a couple of days it's not a major problem, but better safe than sorry.

Regarding the real-time clock, I think that there are three viable solutions:
  • RTC directly connected to the Pi via USB - haven't really been able to find any, but it would be the easiest solution.
  • RTC connected to the Arduino - would need to communicate the time to the Pi via serial, but I'm not sure that a Python application can tell the system to set a specific time.
  • Different screen which enables the use of GPIO pins on the Pi, enabling the use of a miriad of clocks that are available.
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Old 10-27-2019, 06:33 PM   #284
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 It might be a good idea to add a periodic reboot to crontab - in my experience these tend to lock up every few weeks for no apparent reason.
Even if you install sysvinit and nuke systemd to the ground?
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Old 10-27-2019, 07:23 PM   #285
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Originally Posted by Linguofreak View Post
 Even if you install sysvinit and nuke systemd to the ground?
Even if i leave nothing but the Linux kernel and my program as init.
Best i can tell, it's some sort of a brownout issue - the only thing that had an effect was adding a capacitor to the 5V GPIO, but even that failed to stop the lockups completely.

And no, the watchdog timer on the thing does not do anything when it locks up.

In the end i made a board like that with a proper watchdog timer, an RTC and a capacitor -
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