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by aTao
Sat Apr 10, 2021 10:18 am
Forum: Camera board
Topic: raspistill (etc) --help
Replies: 1
Views: 182

raspistill (etc) --help

I have spent quite some time trying to find the range of acceptable values for various parameters, particularly -awbg
Perhaps this could be part of

Code: Select all

raspistill --help
as it is with sharpness, brightness, contrast and saturation..
I have seen someone's best guess for awbg to be 1~8
by aTao
Thu Nov 12, 2020 8:19 pm
Forum: General discussion
Topic: Behringer mixer
Replies: 2
Views: 779

Re: Behringer mixer

I just bought a behringer x air x18 and want to know if there is software to run it on my Raspberry Pi 3? I am new to Raspberry pi however I straight away realised their potential, any help will be greatly appreciated https://dikant.de/2018/02/28/raspberry-xr18-recorder/ There are also a few simila...
by aTao
Mon Jul 13, 2020 4:36 am
Forum: Graphics, sound and multimedia
Topic: Use network connected RPi as a desktop mirror monitor
Replies: 2
Views: 365

Re: Use network connected RPi as a desktop mirror monitor

Many thanks. Its been many weeks of install this, try that. Your post was the trigger I needed: Sounds like you're going about things the wrong way. and Have you tried running a vnc server on your laptop Were the key. To be honest I cant remember if I tried that exactly or some goofy wrapper for it....
by aTao
Sun Jul 12, 2020 8:28 pm
Forum: Graphics, sound and multimedia
Topic: Use network connected RPi as a desktop mirror monitor
Replies: 2
Views: 365

Use network connected RPi as a desktop mirror monitor

My goal is to use the HDMI out of a RPi (zero w) to drive a projector. The image on the projector should be the desktop of my laptop, currently running Ubuntu18, but has Windows10 in there somewhere too. The application (Zoom) I wish to display cannot run on the RPi. There is (and will never be) a k...
by aTao
Sun Mar 22, 2020 12:29 am
Forum: Troubleshooting
Topic: More Pi4 Wifi (and bluetooth)
Replies: 1
Views: 423

More Pi4 Wifi (and bluetooth)

Hate to be yet another but... I havent really found an answer in the threads about this so far.. First up, this is headless, so no HDMI interference (I hope!) SDCard in a Pi Zero W no problem, same card in a Pi4 problem. With either a dead simple vanilla Buster Lite, ssh file in boot partition and w...
by aTao
Thu Mar 05, 2020 12:30 am
Forum: Networking and servers
Topic: eth0 and wlan0 hotspot on same subnet.
Replies: 5
Views: 1586

Re: eth0 and wlan0 hotspot on same subnet.

Well, that was a bag-o-laffs.... As you might be able to tell, its been a while fixing this, mainly due to the overheads in fixing a broken configuration when running headless. Mess up the comms and you gotta re-flash and start again. So, TLDR version. For some (bizarre and unknown reason) something...
by aTao
Sat Feb 22, 2020 12:23 am
Forum: Networking and servers
Topic: eth0 and wlan0 hotspot on same subnet.
Replies: 5
Views: 1586

Re: eth0 and wlan0 hotspot on same subnet.

Thanks epoch but.... It seems to be coming on fine except $ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 sc...
by aTao
Thu Feb 20, 2020 4:05 pm
Forum: Networking and servers
Topic: eth0 and wlan0 hotspot on same subnet.
Replies: 5
Views: 1586

eth0 and wlan0 hotspot on same subnet.

Please excuse my lack of Google-fu, but while it appears that the topic has been done to death, it hasnt, really. What I would like is the Pi wlan0 to be a hotspot and eth0 to be a port on the same subnet. Note that there is no requirement for an internet connection and the hotspot is not bridging/r...
by aTao
Thu Aug 29, 2019 8:51 pm
Forum: Troubleshooting
Topic: Pi Zero W act_led and buster.
Replies: 0
Views: 294

Pi Zero W act_led and buster.

Has the Buster release stopped dtoverlay from making the act_led available to GPIO control?

As I understand it

Code: Select all

dtoverlay=act-led,gpio=47
in /boot/config.txt should expose the led to GPIO 47 control.
by aTao
Thu May 16, 2019 2:22 pm
Forum: General discussion
Topic: Micro SD card wallet/library
Replies: 4
Views: 704

Re: Micro SD card wallet/library

Andyroo wrote:
Tue May 14, 2019 9:14 pm
Adafruit have one for micro SD cards https://www.adafruit.com/product/3664

Also check with the photography and phone manufacturers - both have lots of cases
Thanks Andyroo, but I was really looking for something that included a sizeable crib sheet for whats on each card.
by aTao
Tue May 14, 2019 9:05 pm
Forum: General discussion
Topic: Micro SD card wallet/library
Replies: 4
Views: 704

Micro SD card wallet/library

Has anyone got a great idea info in a product to store micro SD cards that includes a crib sheet for each card? Might be my age and eyesight thing, but I just cant imagine reading much of a label with project name and relevant passwords on the cards...
by aTao
Mon Apr 09, 2018 9:04 pm
Forum: General discussion
Topic: Is it possible to use cron to handle other cron
Replies: 7
Views: 1579

Re: Is it possible to use cron to handle other cron

Sounds all a bit confoozled, and therefore prone to you not knowing why it has gone off and sat in a corner.
are you sure that you couldnt write a single cron job that reads the table and acts accordingly (as in do the job you were going to get the second cron to do)?
by aTao
Sat Mar 17, 2018 7:44 pm
Forum: Automation, sensing and robotics
Topic: different liquid detection using raspberry pi
Replies: 5
Views: 1388

Re: different liquid detection using raspberry pi

It would help if we could see your circuit diagram. I see no reference to how you generate to voltage that you need to measure. The data sheet for the ADC indicates that the source impedance (your probes and glass of liquid) should be as near to 0 ohms as possible. You would need to first use the li...
by aTao
Sat Mar 03, 2018 8:48 pm
Forum: Beginners
Topic: Ring a church bell
Replies: 3
Views: 1201

Re: Ring a church bell

as others have said, the programming is no problem, its the actuator thats the tricksy part. and that depends on the bell and existing mechanism. There are 2 types of bell mechanism, clocks and chimes (as in what bell ringers or campanologists to be fancy) pull on. The clock bell uses a hammer that ...
by aTao
Sun Feb 18, 2018 5:10 pm
Forum: Off topic discussion
Topic: How good is current AI ?
Replies: 15
Views: 4209

Re: How good is current AI ?

aTao, First, the Tesla that didnt see a truck. There isnt a human driver on this planet that wouldnt have seen the truck. Sure there are people that do crash into trucks they didnt see, but its because they werent concentrating, not because they didnt recognise it. So what? From a practical point o...
by aTao
Sun Feb 18, 2018 1:03 am
Forum: Off topic discussion
Topic: How good is current AI ?
Replies: 15
Views: 4209

Re: How good is current AI ?

Given that we dont yet know how a neuron works, modelling a learning machine on it is a bit barking up the wrong tree. The electrical signal is just one (possibly small and misunderstood) aspect, there is chemical signalling and physical signalling/ signal routing. The nano code for a supposed AI ma...
by aTao
Fri Feb 09, 2018 9:54 pm
Forum: Beginners
Topic: Using a Pi Zero W to detect a mains powered doorbell press
Replies: 8
Views: 2137

Re: Using a Pi Zero W to detect a mains powered doorbell press

Dont need bridge rectifier, a single diode doing half wave will do. Just put some signal debouncing in software (if you think you have over 50 bell presses per second, its probably 1 long press!) Apart from that, to take the circuit from 25Vac in to 15Vac then start with the resistor in the diagram ...
by aTao
Tue Jan 23, 2018 10:29 pm
Forum: General discussion
Topic: Voltage to Current board
Replies: 7
Views: 1650

Re: Voltage to Current board

You can make (or easier still buy) voltage controlled current source http://www.linear.com/solutions/4475 for example. However, I'm not sure that it will solve the undelying problem of why the ball wont stay in the middle. I would suggest that you: A cheat (put a magnet under the plate) B examine yo...
by aTao
Thu Jan 18, 2018 6:48 pm
Forum: Beginners
Topic: Why Should I or Should Not Learn Scratch?
Replies: 4
Views: 1031

Re: Why Should I or Should Not Learn Scratch?

At some point it is very useful to be able to learn any language, to understand the fundamental differences and how (and how not) to use them. But that is not necessarily a beginning. As mattmiller said if Python is going well, stick with it, if you have time and energy for another language Scratch ...
by aTao
Wed Jan 17, 2018 5:56 pm
Forum: Python
Topic: Fingerprint comparison
Replies: 9
Views: 3303

Re: Fingerprint comparison

The images are processed to generate a map of the print. Things like whorl, arch, loop, number of ridges between the whorl and any branches, how may loops before the next branch and the like.
by aTao
Mon Jan 08, 2018 4:10 pm
Forum: Automation, sensing and robotics
Topic: Homebrew Solution for Monitoring Heating Oil Levels
Replies: 1
Views: 987

Re: Homebrew Solution for Monitoring Heating Oil Levels

Oil consumption is very low (in litres per minute) so there is almost no pressure drop along the supply pipe to the boiler (in the house). So, to first avoid outdoor electronics and needing to run power out and data back: I would recommend a pressure sensor very close to the boiler. Ideally an I2s u...
by aTao
Sun Jan 07, 2018 8:42 pm
Forum: Troubleshooting
Topic: I think I damaged my SD card port in Pi 3
Replies: 2
Views: 656

Re: I think I damaged my SD card port in Pi 3

Bit of fluff in the socket??
by aTao
Sat Sep 02, 2017 9:07 pm
Forum: General programming discussion
Topic: Which language Python or Java or C++
Replies: 18
Views: 7595

Re: Which language Python or Java or C++

Power measurement ic with I2c connection: MAXQ314
I2c bi directional isolator ISO1540

read the power just as often as you can.
by aTao
Sun Aug 27, 2017 9:14 pm
Forum: General programming discussion
Topic: Which language Python or Java or C++
Replies: 18
Views: 7595

Re: Which language Python or Java or C++

OK, so forget RMS (for now) and consider what you want to measure. For energy monitoring you want to measure power used, and that isnt going to change at 50Hz, is it? If you do a bit of analog electronic pre processing you can get your sample rate down to something mush more manageable. Say each cha...
by aTao
Tue Aug 08, 2017 10:41 am
Forum: Troubleshooting
Topic: Magnet - degaussing coil - ruined Pi Zero?
Replies: 7
Views: 2216

Re: Magnet - degaussing coil - ruined Pi Zero?

drgeoff wrote:
Mon Aug 07, 2017 9:45 pm
delousing?
Yeah, a magnetised telly has a lousy picture.

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