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by drgeoff
Tue Oct 16, 2018 12:47 am
Forum: General discussion
Topic: Raspi Zero W not showing up as an RNDIS gadget
Replies: 4
Views: 57

Re: Raspi Zero W not showing up as an RNDIS gadget

You do have the cable plugged in to the micro-USB socket nearest the HDMI socket?
by drgeoff
Mon Oct 15, 2018 5:18 pm
Forum: General discussion
Topic: smart power consumption monitoring system
Replies: 2
Views: 62

Re: smart power consumption monitoring system

First off, we're talking of a project involving mains power. Are you familiar with the dangers of mains (electrocution, fire and destruction of Pi), and the practices necessary to stay safe? There are different ways of measuring mains current, some are intrusive , some rely on electromagnetic coupl...
by drgeoff
Sat Oct 13, 2018 6:33 pm
Forum: Advanced users
Topic: How do I read exact analog voltage?
Replies: 4
Views: 136

Re: How do I read exact analog voltage?

@Dante21 Just as you would not use a 30 cm ruler to measure the distance between London and Paris or to measure the diameter of a human hair, you will need to know what range of voltages to expect from your sensor. For any particular A to D converter you may need to amplify small voltages or attenua...
by drgeoff
Fri Oct 12, 2018 6:22 pm
Forum: Troubleshooting
Topic: reported temperature incorrect
Replies: 2
Views: 102

Re: reported temperature incorrect

What model RPi? What OS and version?
by drgeoff
Thu Oct 11, 2018 8:14 pm
Forum: Troubleshooting
Topic: only red light on, help.
Replies: 12
Views: 192

Re: only red light on, help.

The square one with 32 pins near the power input socket. Good luck with replacing that, assuming you can source a new one. The post I linked to comes close to the Foundation admitting there is a problem with some units. Contact your seller pointing out that you are following the advice of a Raspberr...
by drgeoff
Thu Oct 11, 2018 2:42 pm
Forum: Advanced users
Topic: How to cycle +5v power on individual ports via software
Replies: 3
Views: 123

Re: How to cycle +5v power on individual ports via software

I found this thread: https://www.raspberrypi.org/forums/viewtopic.php?t=93463 but it seems back in 2016 the question of how to cycle the +5v power on individual ports via software wasn't really answered/addressed. Is it possible to cycle the +5v power on individual ports via software, ideally Pytho...
by drgeoff
Thu Oct 11, 2018 2:23 pm
Forum: Troubleshooting
Topic: only red light on, help.
Replies: 12
Views: 192

Re: only red light on, help.

That 0 volts instead of 3.3 on pin 1 means the RPi is dead.

https://www.raspberrypi.org/forums/view ... 8#p1375778
by drgeoff
Wed Oct 10, 2018 8:38 pm
Forum: General discussion
Topic: under voltage detected
Replies: 19
Views: 379

Re: under voltage detected

soydepr wrote:
Wed Oct 10, 2018 8:27 pm
care recommend one
The official RPi one is highly recommended.
by drgeoff
Tue Oct 09, 2018 11:39 am
Forum: General discussion
Topic: Having trouble booting my Pi Zero [solved]
Replies: 16
Views: 394

Re: Having trouble booting my Pi Zero

The SD card you ordered should have contained an OS. Did you try using that with the Zero before overwriting it? If yes, did it boot?

The LED on the Zero should flash randomly as the Zero boots.

What card reader are you using to put NOOBS or Raspbian on the card?
by drgeoff
Mon Oct 08, 2018 6:13 pm
Forum: General discussion
Topic: wifi not working in raspberry pi 3b+
Replies: 2
Views: 95

Re: wifi not working in raspberry pi b+

@ankitjangid

You risk getting no or wrong answers about a problem with a 3B+ if you refer to it as a B+.
by drgeoff
Sun Oct 07, 2018 5:00 pm
Forum: Troubleshooting
Topic: raspberry pi 3b+ with old preloaded sd card
Replies: 9
Views: 199

Re: raspberry pi b+ old preloaded sd card

@chronicbomber420

Do yourself a favour and desist from calling a RPi 3B+ a B+. Both those versions of RPi have been produced. They do have differences which are often important when asking for help on these forums.
by drgeoff
Sun Oct 07, 2018 10:20 am
Forum: Troubleshooting
Topic: Solved: Raspberry pi 3 b+ will not boot.
Replies: 22
Views: 397

Re: My Raspberry pi 3 b+ will not boot. help needed

Yes, If you are not getting close to 3.3 volts on pin 1, the RPi will behave as you described in your first post. It is effectively dead.
by drgeoff
Sat Oct 06, 2018 11:37 pm
Forum: Troubleshooting
Topic: Solved: Raspberry pi 3 b+ will not boot.
Replies: 22
Views: 397

Re: My Raspberry pi 3 b+ will not boot. help needed

4.86 volts is not low enough to prevent a RPI 3B+ at least starting to boot with flashes of the green ACT LED and something on a suitable attached HDMI display. While this is true, a meter masks the actual waveform and therefore the voltage minima. 4.86V is indicative of a poor PSU, or a poor cable...
by drgeoff
Sat Oct 06, 2018 10:54 pm
Forum: Troubleshooting
Topic: Solved: Raspberry pi 3 b+ will not boot.
Replies: 22
Views: 397

Re: My Raspberry pi 3 b+ will not boot. help needed

4.86 volts is not low enough to prevent a RPI 3B+ at least starting to boot with flashes of the green ACT LED and something on a suitable attached HDMI display.

Burngate asked for the voltage at pin 1. That should be 3.3 volts. 5 volts would be on pin 2.
by drgeoff
Sat Oct 06, 2018 5:39 pm
Forum: Troubleshooting
Topic: Can't get Ethernet connection to work
Replies: 19
Views: 350

Re: Can't get Ethernet connection to work

theRainInSpain wrote:
Sat Oct 06, 2018 5:28 pm
I mean to write 'dhcpcd.conf' file
For future reference, one is able to edit a post after posting it.
by drgeoff
Sat Oct 06, 2018 10:31 am
Forum: Beginners
Topic: exFat vs FAT32
Replies: 4
Views: 135

Re: exFat vs FAT32

Neither.

Use a native Linux format eg ext4.
by drgeoff
Fri Oct 05, 2018 11:08 pm
Forum: Troubleshooting
Topic: Can't get Ethernet connection to work
Replies: 19
Views: 350

Re: Can't get Ethernet connection to work

Is this a 3B as stated in the opening post or is it actually a 3B+ ?
by drgeoff
Fri Oct 05, 2018 6:52 pm
Forum: Troubleshooting
Topic: Can't get Ethernet connection to work
Replies: 19
Views: 350

Re: Can't get Ethernet connection to work

Hello there, Thank you for your help. Yes I have tried different cables. The connection always works with my laptop but not the Pi for some reason. the assigned IP address 192.168.178.30 does not show on ifconfig. Any other debugging suggestions most welcome. :D eth0: flags=4163<UP,BROADCAST,RUNNIN...
by drgeoff
Fri Oct 05, 2018 6:43 pm
Forum: Beginners
Topic: Does Pi 3 Model B+ capable of converting digital to analogue?
Replies: 1
Views: 59

Re: Does Pi 3 Model B+ capable of converting digital to analogue?

Yes.

(All RPis with a 3.5 mm socket can output stereo analogue audio.)
by drgeoff
Fri Oct 05, 2018 3:27 pm
Forum: Networking and servers
Topic: AP not working
Replies: 4
Views: 115

Re: AP not working

avoeten wrote:
Fri Oct 05, 2018 12:45 pm
3b / update/upgrade:

I followed the AP instructions but don't understand the ETH0 part ... should that be WLAN0 ?
No, it should probably be eth0 but eth0 appears 9 times on that page so which one(s) are you asking about?
by drgeoff
Fri Oct 05, 2018 11:12 am
Forum: General discussion
Topic: "Unfortunately, I do not have a scope, nor does anybody I know."
Replies: 12
Views: 465

Re: "Unfortunately, I do not have a scope, nor does anybody I know."

I have a DSO188 (currently on offer from Banggood for £20). Claims 1 MHz bandwidth which is fine for audio and low speed logic but only single channel and extremely limited triggering options. And being battery powered can be connected to circuits that are not mains isolated. For "heavier lifting" I...
by drgeoff
Fri Oct 05, 2018 10:53 am
Forum: Beginners
Topic: Reading data from gps on the website
Replies: 5
Views: 102

Re: Reading data from gps on the website

If my RC car would move by 1 m, I would like these coordinates to change as well. . The "noise" in the position reported by a consumer GPS is more than 1 metre. If you are not seeing that noise then the GPS receiver has filtering or "inertia" enabled. Either way, are you sure that GPS is suitable f...
by drgeoff
Wed Oct 03, 2018 10:19 pm
Forum: General discussion
Topic: Pi as basis for laptop
Replies: 13
Views: 357

Re: Pi as basis for laptop

Regarding the powerboost1000c, I would've hoped that it could power the pi via mini-USB and then send an ACPI power down code as if it were a keyboard when the battery gets low. Maybe too much to hope for. 1. The power input on RPis is a micro-USB socket, not mini-USB. 2. The power input micro-USB ...
by drgeoff
Wed Oct 03, 2018 9:54 pm
Forum: Off topic discussion
Topic: Recommendations for a good, but cheap, multimeter
Replies: 28
Views: 7696

Re: Recommendations for a good, but cheap, multimeter

I use this for a year and it is good to measure anything and it is cheap and precize. http://www.ebay.com/itm/LCD-Auto-Range-AC-DC-Digital-Voltmeter-Ammeter-Ohmmeter-Multimeter-Volt-Tester-/201547218198?hash=item2eed267d16:g:p-AAAOSwoudW8mdU Jadro Thanks for this - I've just got a black version her...
by drgeoff
Wed Oct 03, 2018 6:38 pm
Forum: Troubleshooting
Topic: No HDMI Signal after changing power delivery method
Replies: 11
Views: 250

Re: No HDMI Signal after changing power delivery method

Have you done the obvious test of trying the original powering method (ie USB 3.0) again? If that works, the "power brick" is under suspicion. If it does not work, did you do a proper software shutdown before swapping the supplies. If not you may have corrupted the SD card. In which case try putting...

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