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by drgeoff
Sun Sep 23, 2018 10:18 pm
Forum: Troubleshooting
Topic: Pi Zero audio output using micro USB headphones
Replies: 2
Views: 65

Re: Pi Zero audio output using micro USB headphones

I'd never heard of micro-USB earphones so I did a bit of Googling and found info such as that at https://android.stackexchange.com/questions/29275/micro-usb-headphone-support-in-android. That says the earphones are just ordinary analogue ones but with a micro-USB plug instead of the more usual 3.5 m...
by drgeoff
Thu Sep 20, 2018 11:08 pm
Forum: Beginners
Topic: Audio Jack Output Capabilities
Replies: 6
Views: 141

Re: Audio Jack Output Capabilities

FTrevorGowen wrote:
Thu Sep 20, 2018 9:33 pm
those older Pi's had different output circuitry IIRC (and the changes have been discussed in other threads).
The changes have been to improve audio quality. The impedance and drive level are more or less the same across all RPi models with analogue audio output.
by drgeoff
Thu Sep 20, 2018 9:27 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: how to use the GPIOs
Replies: 18
Views: 500

Re: Hardware

There is a lot more to safely controlling mains with a RPi than a schematic diagram.
by drgeoff
Wed Sep 19, 2018 12:03 pm
Forum: Troubleshooting
Topic: Problem for undervoltage
Replies: 19
Views: 253

Re: Problem for undervoltage

The 5 volt pin of the micro-USB socket and the 5 volt pins of the GPIO header are on opposite ends of the polyfuse.
by drgeoff
Wed Sep 19, 2018 8:16 am
Forum: Troubleshooting
Topic: Problem for undervoltage
Replies: 19
Views: 253

Re: Problem for undervoltage

Joel_Mckay wrote:
Wed Sep 19, 2018 8:06 am
Your power supply may be too low try a 5V 5A minimum supply if you have usb devices plugged in....
The polyfuse on the micro-USB power input will not pass 5 Amps. A PSU that truly meets the specified 2.5 Amps at 5 Volts is adequate.
by drgeoff
Tue Sep 18, 2018 9:11 am
Forum: Troubleshooting
Topic: RPI3B+, POE-Hat and TSOP at GPIO, low range!
Replies: 2
Views: 76

Re: RPI3B+, POE-Hat and TSOP at GPIO, low range!

The official RPi PoE HAT? Are you aware of its design defects?

Read the details at https://www.raspberrypi.org/forums/view ... 5&t=220984
by drgeoff
Mon Sep 17, 2018 5:40 pm
Forum: Add-ons
Topic: Can I run a Raspberry-Pi 3 B+ with 5" LCD touchscreen on Rechargeable batteries?
Replies: 4
Views: 120

Re: Can I run a Raspberry-Pi 3 B+ with 5" LCD touchscreen on Rechargeable batteries?

Yes but as there are more types and sizes of "rechargeable batteries" commonly available than you have fingers and toes that "yes" may not be much use to you. Also note that there is currently no cell chemistry which can provide a battery giving 5 volts for a significant portion of its discharge cyc...
by drgeoff
Mon Sep 17, 2018 8:51 am
Forum: Beginners
Topic: Imaging SD Card Changing the Format of my SD Card
Replies: 5
Views: 156

Re: Imaging SD Card Changing the Format of my SD Card

You seem a bit confused. 1. A new 32 Gbyte card will come formatted as FAT32 and usual formatters will format it as FAT32. 2. When putting an OS image on a card the existing format is overwritten. Whatever format the card has is irrelevant. 3. If your retropi card is not booting then you have not wr...
by drgeoff
Fri Sep 14, 2018 1:29 pm
Forum: Beginners
Topic: Illuminated push button
Replies: 41
Views: 797

Re: Illuminated push button

Jukebox Mike wrote:
Fri Sep 14, 2018 11:47 am
Hi.
Like this one - https://www.ebay.co.uk/itm/12mm-Silver- ... -Momentary
Incomplete link.
by drgeoff
Thu Sep 13, 2018 8:29 am
Forum: Add-ons
Topic: PoE HAT - USB Ports not working - over-current
Replies: 152
Views: 9997

Re: PoE HAT - USB Ports not working - over-current

... which currently the official hat doesn't [work]. Personally I'll be sticking to the other PoE splitters readily available for now until the RPI team get this slipup sorted out and will get the "fixed" official hat when it's available. 3 To me, it sounds more like a problem with the Pi3b+, rathe...
by drgeoff
Wed Sep 12, 2018 4:29 pm
Forum: Troubleshooting
Topic: Sharing a wifi connection over USB using static IP
Replies: 1
Views: 46

Re: Sharing a wifi connection over USB using static IP

If you want to use static IP you need to configure more than the IP address. Gateway and DNS. Didn't wherever you found that "static ip_address = ...." show lines for them?
by drgeoff
Wed Sep 12, 2018 4:21 pm
Forum: Beginners
Topic: Illuminated push button
Replies: 41
Views: 797

Re: Illuminated push button

If, as I suspect, this is a small filament lamp or similar, can I still use it as a status lamp on Pi GPIO pins in the same way as an LED? Probably not. You should not have a GPIO source or sink more than 16 mA. A filament lamp running at 3.3 volts and 16 mA is likely to be exceeding dim. Also I ex...
by drgeoff
Tue Sep 11, 2018 6:26 pm
Forum: Add-ons
Topic: PoE HAT - USB Ports not working - over-current
Replies: 152
Views: 9997

Re: PoE HAT - USB Ports not working - over-current

An extra question: is anyone knows if there is a power priority management if both 5V PSU & PoE are connected? I can't see that is any different from powering via the micro-USB socket and the GPIO header at the same time. There is no sensing upwind of the output side of the polyfuse which could be ...
by drgeoff
Tue Sep 11, 2018 6:07 pm
Forum: General discussion
Topic: how to use 40 pin gpio cable extender
Replies: 9
Views: 260

Re: how to use 40 pin gpio cable extender

I would need more convincing that reversal is safe. It isn't safe. The "you need to be very careful not to twist the ribbon around otherwise you'll be inverting the pins relative to what you're plugging in, but it should work." was badly phrased leaving it open to misinterpretation. The "it should ...
by drgeoff
Tue Sep 11, 2018 4:56 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Cable connections for can bus board
Replies: 4
Views: 79

Re: Cable connections for can bus board

DB9 connectors are commonly used with RS-232 signals. The serial ports on RPis do NOT use RS-232 voltage levels. In fact connecting an RS-232 Tx to the Rx pin of a RPi an cause fatal damage to the RPi.

First step is to ascertain what signals are on the DB9.
by drgeoff
Tue Sep 11, 2018 4:35 pm
Forum: General discussion
Topic: how to use 40 pin gpio cable extender
Replies: 9
Views: 260

Re: how to use 40 pin gpio cable extender

Some 40 way female to 40 way female cables are intended to connect PATA hard drives to motherboards. Some of those cables have 80 wires - the extra 40 are grounded and reduce signal interference between the other 40. Using such a 40 way but 80 wire cable on a RPi will destroy the RPI immediately pow...
by drgeoff
Tue Sep 11, 2018 3:33 pm
Forum: Add-ons
Topic: PoE HAT - USB Ports not working - over-current
Replies: 152
Views: 9997

Re: PoE HAT - USB Ports not working - over-current

An extra question: is anyone knows if there is a power priority management if both 5V PSU & PoE are connected? I can't see that is any different from powering via the micro-USB socket and the GPIO header at the same time. There is no sensing upwind of the output side of the polyfuse which could be ...
by drgeoff
Mon Sep 10, 2018 1:38 pm
Forum: Troubleshooting
Topic: Pi 3 B+ Red light [mystery solved]
Replies: 13
Views: 447

Re: Pi 3 B+ Red light

vargabp wrote:
Mon Sep 10, 2018 10:10 am
I don't suppose the SoC is something I could swap out with hot air...?
Even if you could source a replacement SoC (which to all intents and purposes you cannot) the probability of successfully swapping one out with hot air is low.
by drgeoff
Sun Sep 09, 2018 11:24 pm
Forum: Other projects
Topic: motor controller
Replies: 2
Views: 139

Re: motor controller

beatsal wrote:
Sun Sep 09, 2018 1:36 am
Trying to use RPI to control a TurnTable motor which has 4 coils fed at 90 deg phase shift @ 24 VDC, 2A. Any ideas appreciated.
What does "control" mean to you?

Turn it on and off, vary the speed, change direction of rotations are some of the possible meanings.
by drgeoff
Sun Sep 09, 2018 10:53 pm
Forum: General discussion
Topic: Wired Heating/Cooling Theremostat
Replies: 4
Views: 126

Re: Wired Heating/Cooling Theremostat

Wired thermostats frequently switch AC mains voltages. Given your confessed newness to RPis, Arduinos and possibilities and, so far at least, no provided indications that you are sufficiently knowledgeable to safely work on or make modifications to installations using mains voltages, I believe it wo...
by drgeoff
Sun Sep 09, 2018 6:26 pm
Forum: Add-ons
Topic: PoE HAT - eth0 not working
Replies: 3
Views: 213

Re: PoE HAT - eth0 not working

If you have log messages about smsc95xx then you do NOT have a 3B+. The smsc95xx is the 10/100 chip used on all boards prior to the 3B+. The 3B+ uses the lan78xx driver. Do you have the extra 4 pins (2x2) beside the 40 pin GPIO header that the PoE HAT uses to pick up the ethernet power taps? If not...
by drgeoff
Sat Sep 08, 2018 11:33 pm
Forum: Other projects
Topic: Power adapter with 5v 4amp pi3 B+
Replies: 11
Views: 328

Re: Power adapter with 5v 4amp pi3 B+

Pi3 B+ overclocked cpu and gpu, hard drive and two fans in a nintendo 8bit case. Would a 4amps power adapter burn the mothercard? The electricity supply to your house can provide tens of Amperes yet even if the only thing switched on is a 5 Watt LED lamp (0.05 Amperes in US or 0.025 Amperes in Euro...
by drgeoff
Sat Sep 08, 2018 11:15 pm
Forum: Troubleshooting
Topic: Wired Ethernet upload faster than download
Replies: 29
Views: 847

Re: Wired Ethernet upload faster than download

In any case, flow control or not, it doesn't explain why I get so much faster speeds on my PC with Gbit Ethernet connected to the same router. There appears to be something funky with the pi that is causing this. Read the thread you were pointed to in the very first reply to you. Yes that is a long...
by drgeoff
Fri Sep 07, 2018 5:26 pm
Forum: General discussion
Topic: Problem SD Card Formatting
Replies: 3
Views: 107

Re: Problem SD Card Formatting

When I try to install NOOBS on my 32 GB SD card I get a message that I need another 1.44. I am using the SD's Association formatting tool. What am I doing wrong. G-Mack Another 1.44 what? A brand new card or one that has already been used with a RPi? If the latter and the SD Assoc Formatter is a ve...
by drgeoff
Fri Sep 07, 2018 5:20 pm
Forum: Beginners
Topic: Connecting iPad Pro with SSD
Replies: 4
Views: 135

Re: Connecting iPad Pro with SSD

My understanding is not that the OP has an RPI up and running with an OS. Rather he has described the functionality he requires and asks if an RPi could meet that requirement and if so how. Many Android tablets can host a USB drive. Can't an iPad do that? Otherwise get a RPi with onboard Wi-Fi eg a ...

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