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by PhilBr
Sun Jun 30, 2019 9:14 am
Forum: Advanced users
Topic: Windows Boot process Modification using Raspberry Pi
Replies: 3
Views: 178

Re: Windows Boot process Modification using Raspberry Pi

Such as by configuring the cmos settings of the windows machine to boot up at power on. Have the pi control the power?
Phil
by PhilBr
Wed Jun 19, 2019 2:46 pm
Forum: General discussion
Topic: Is my cell phone charger good enough to supply power to my raspberry pi
Replies: 20
Views: 1140

Re: Is my cell phone charger good enough to supply power to my raspberry pi

I see messages like this so often!
Do you think we need a specific sticky 'phone chargers do not work'.
Not only will the voltage sag as load increases, but I fear won't some be regulated and will give over-voltage at times, with damaging consequences.
Phil
by PhilBr
Wed Jun 05, 2019 9:15 pm
Forum: General discussion
Topic: Potato Weather Station
Replies: 1
Views: 136

Re: Potato Weather Station

You will have to provide power of some sort if only to power the sensors! In general sensor output is low power which would not transmit easily over the distances you mention.
You could consider power over Ethernet so you can place the pi close to the sensors.
Phil
by PhilBr
Thu May 09, 2019 9:52 pm
Forum: General discussion
Topic: Snowmobile project?
Replies: 7
Views: 502

Re: Snowmobile project?

I will not be popular for saying this as it does not include a pi solution.
I have a Garmin Oregon GPS receiver which does all you want and can also include maps. There will be more modern devices with similar properties.
Phil
by PhilBr
Tue May 07, 2019 9:07 pm
Forum: Beginners
Topic: Mounting Pi and PIR
Replies: 3
Views: 173

Re: Mounting Pi and PIR

If you are using wifi then are you aware of this thread?
viewtopic.php?t=112111
Phil
by PhilBr
Thu Feb 28, 2019 7:23 pm
Forum: Beginners
Topic: PCB connector crimp tool.
Replies: 5
Views: 302

Re: PCB connector crimp tool.

Thanks for the replies. I'll try pliers !
Phil
by PhilBr
Mon Feb 25, 2019 5:48 pm
Forum: Beginners
Topic: PCB connector crimp tool.
Replies: 5
Views: 302

PCB connector crimp tool.

I’m trying to find a suitable crimping tool for some small 0.1” spaced pcb connectors. The connectors are like this: https://cpc.farnell.com/leoco/08-50-0032/crimp-terminals-100-pack/dp/CN05551?ost=cn05551&ddkey=https%3Aen-CPC%2FCPC_United_Kingdom%2Fsearch They fit in housings https://cpc.farnell.co...
by PhilBr
Tue Jan 15, 2019 9:44 pm
Forum: Troubleshooting
Topic: issue to set-up SSH in Wifi
Replies: 9
Views: 689

Re: issue to set-up SSH in Wifi

This is a bit of an aside but it might trigger some thoughts. I have a tp-link W8970 router which has a tick box option under 'wireless advanced' called 'enable client isolation'. When ticked, WiFi to WiFi is indeed blocked though ether <-> ether and WiFi <-> ether all work. When unticked WiFi to Wi...
by PhilBr
Sat Dec 29, 2018 10:31 am
Forum: Python
Topic: DENIED! Am I nuts?
Replies: 16
Views: 700

Re: DENIED! Am I nuts?

If you add extra dummy parameters to the end of your line before you split it then I expect it will show that the data you are receiving is not quite what you expected.
Phil
by PhilBr
Sat Dec 29, 2018 10:23 am
Forum: Python
Topic: GPIO.add_event_detect with bouncetime Trace false tick
Replies: 2
Views: 220

Re: GPIO.add_event_detect with bouncetime Trace false tick

In the absence of other responses I'll jump in here, but it's an indirect answer. You could try the program with and without the bounce and see the difference. Or you could apply your signal to two gpio pins and program one with bounce, one without. Or you could try without bounce, program your own ...
by PhilBr
Tue Nov 27, 2018 11:29 pm
Forum: Beginners
Topic: correct backup command?
Replies: 9
Views: 1001

Re: correct backup command?

I understand that you do require the trailing slashes for directory names for rsync.
See this description:
http://www.mikerubel.org/computers/rsyn ... ots/#Rsync
Phil
by PhilBr
Fri Nov 23, 2018 4:09 pm
Forum: General discussion
Topic: Automatic Server Backups!
Replies: 3
Views: 560

Re: Automatic Server Backups!

Try Google 'mike rubel rsync'. He describes a system for taking regular (say daily or twice daily) backups of a server. The clever part is that only the changed files are stored so it saves on space and is lightning fast. A brilliant concept! I run a pi doing snapshots each night of my nas with abou...
by PhilBr
Thu Nov 15, 2018 5:45 pm
Forum: Beginners
Topic: TV HAT
Replies: 3
Views: 704

Re: TV HAT

Does it work if you remove the boom?
See this
https://www.raspberrypi.org/blog/raspberry-pi-tv-hat/
Dom on 18 October suggests it is I2S incompatible.

Also if this is your device:
https://www.justboom.co/product/justboom-dac-hat/
Suggests it is I2S.
Regards
Phil
by PhilBr
Wed Nov 07, 2018 3:18 pm
Forum: Beginners
Topic: Shower time project
Replies: 14
Views: 720

Re: Shower time project

You say that start and stop time would do.
Use a PIR on the ceiling?
Phil
by PhilBr
Thu Nov 01, 2018 6:00 pm
Forum: Advanced users
Topic: Bridge to Android Phone's Internet Connection
Replies: 5
Views: 325

Re: Bridge to Android Phone's Internet Connection

With that setup you appear to have two devices offering DHCP services. Switch the DHCP server in the router off and rely on the Android phone to do that.
Phil
by PhilBr
Fri Oct 26, 2018 11:57 am
Forum: Python
Topic: Need Help Counting Pulses - PWM Tach Signal
Replies: 5
Views: 1163

Re: Need Help Counting Pulses - PWM Tach Signal

My wiki reading suggest that your fan output will be an open collector transistor which generates two pulses per rev of the fan. You say that you are seeing these pulses but see ‘noise’ on your oscilloscope trace after the negative going edge but you have clean positive going edge. I’d check earthin...
by PhilBr
Mon Oct 22, 2018 9:45 pm
Forum: Automation, sensing and robotics
Topic: Connecting Pi to reed switches on long cable
Replies: 10
Views: 1779

Re: Connecting Pi to reed switches on long cable

I don't know what happened to my posting. It should only have one setup line.
Phil
by PhilBr
Mon Oct 22, 2018 6:27 pm
Forum: Automation, sensing and robotics
Topic: Connecting Pi to reed switches on long cable
Replies: 10
Views: 1779

Re: Connecting Pi to reed switches on long cable

Why not just try connecting between GPIO input and ground? Pull the GPIO up high internally. eg for GPIO 5: GPIO.setmode(GPIO.BCM)GPIO.setmode(GPIO.BCM) GPIO.setup(5,GPIO.IN, pull_up_down=GPIO.PUD_UP) GPIO.setup(5,GPIO.IN, pull_up_down=GPIO.PUD_UP) If you get spurious signals due to noise, try a cap...
by PhilBr
Tue Oct 02, 2018 6:18 pm
Forum: Python
Topic: Wait for edge - false timeout
Replies: 20
Views: 1624

Re: Wait for edge - false timeout

Hi Mike, If you are looking for a warning of a single missed pulse on any one of a number of inputs then it looks tough challenge for a pi without external hardware. If however you are asking for an alert to be generated within a few seconds if one of the lines stops pulsing completely then I’d try ...
by PhilBr
Mon Oct 01, 2018 6:12 pm
Forum: General discussion
Topic: New glossary
Replies: 44
Views: 2090

Re: New glossary

Great idea. Add blue smoke? Ohm, Kilo ohm often written eg 3k3 for 3300 ohms or 3300 (ohms symbol).
Phil
by PhilBr
Tue Sep 18, 2018 6:29 pm
Forum: General discussion
Topic: Pi Zero test points
Replies: 7
Views: 4745

Re: Pi Zero test points

When I tested the 3.3 v pp8 pad it came up with 0.1 volts
Pp9 was 2.3 volts instead of 1.8
And the winner was pp5 @ 10.2 volts
.

What were you measuring relative to? Where was the voltmeter negative connection? How was it powered at the time?
Phil
by PhilBr
Tue Sep 11, 2018 6:36 pm
Forum: General discussion
Topic: how to use 40 pin gpio cable extender
Replies: 9
Views: 659

Re: how to use 40 pin gpio cable extender

drgeoff: I think we are in total agreement over this - reversal (ie 180 a degree turn) could be fatal, depending on what is on the other end of the cable. 80 way cables are also fatal, even without anything on the end. I was responding to: A glance at an RPi pinout diagram like this https://pinout.x...
by PhilBr
Tue Sep 11, 2018 4:51 pm
Forum: General discussion
Topic: how to use 40 pin gpio cable extender
Replies: 9
Views: 659

Re: how to use 40 pin gpio cable extender

I would need more convincing that reversal is safe. As an example, consider a extender board which grounds BCM17 (pins 11-39) either directly or through (say) relay contacts. Wouldn't an inverted / reversed cable then connect pins 2 to 30? That results in 5 volts shorted to ground! There are lots of...
by PhilBr
Tue Sep 11, 2018 4:33 pm
Forum: General discussion
Topic: Raspberry Pi as NAS / private cloud
Replies: 8
Views: 908

Re: Raspberry Pi as NAS / private cloud

You might like to google Mike Rubel and his very clever ideas on rsync to take snapshots rather than going raid. I have a conventional Synology NAS (two disks) and also use a little Pi to take nightly snapshots of it, but it would also work snap-shotting a conventional disk. I keep 5 daily, 4 weekly...
by PhilBr
Sun Sep 09, 2018 6:35 pm
Forum: Beginners
Topic: Shutdown at command level
Replies: 8
Views: 598

Re: Shutdown at command level

It should all work if you simply close everything down (close files, reset GPIO, etc), issue the shutdown then

Code: Select all

sys.exit(0)
That should terminate the program and be both simple and safe.
Phil

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