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by TerryC65
Wed Mar 15, 2017 8:22 pm
Forum: Troubleshooting
Topic: GPIO Pins seem to have no Oomph
Replies: 11
Views: 1358

Re: GPIO Pins seem to have no Oomph

joan wrote:Have you double checked the pins you are using?

RPi.GPIO lets you select pin numbering (BOARD) or GPIO numbering (BCM).
Triple and quadruple. I'm using BCM numbering so GPIO 17 is on Board pin 11. Also I have observed the pins pulsing and the pulses stop when loaded.
by TerryC65
Wed Mar 15, 2017 7:29 pm
Forum: Troubleshooting
Topic: GPIO Pins seem to have no Oomph
Replies: 11
Views: 1358

Re: GPIO Pins seem to have no Oomph

Have a look / Google for Gert van Loo's document entitled GPIO pads control, errata (or something like) It gives the magic runes to change the GPIO current capabilities. Thanks. I found that. If I've understood what it is telling me, the setting is achieved by writing to a register. It seems unlike...
by TerryC65
Wed Mar 15, 2017 4:24 pm
Forum: Troubleshooting
Topic: GPIO Pins seem to have no Oomph
Replies: 11
Views: 1358

GPIO Pins seem to have no Oomph

Hi, My project is using simple MOSFET circuits to drive a couple of solenoids. When I tested the system nothing worked. I have a simple Arduino based scope, so I wrote a very simple ON-OFF looping program and removed the 'Signal' connection (the GPIO line) from one of the MOSFETs and had a look at t...
by TerryC65
Thu Jan 05, 2017 3:04 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Conflicts when using a USB Hub and Audio Adaptors
Replies: 5
Views: 938

Re: Conflicts when using a USB Hub and Audio Adaptors

Answering myself again, there seems to be a third option (or maybe it's a subset of the first). I now think I understand a bit more about what is going on with these two situations, after a bit more help from my LUG. I tried to attach the outputs of 'lsusb -v' when the three devices are connected to...
by TerryC65
Thu Jan 05, 2017 9:47 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Conflicts when using a USB Hub and Audio Adaptors
Replies: 5
Views: 938

Re: Conflicts when using a USB Hub and Audio Adaptors

A member of our local LUG spotted this https://www.raspberrypi.org/documentation/hardware/raspberrypi/usb/README.md#support . If I've understood this correctly the Broadcom chip has a single USB port which has to carry all traffic. However, although the article only seems to apply to Models A and B,...
by TerryC65
Wed Jan 04, 2017 4:15 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Conflicts when using a USB Hub and Audio Adaptors
Replies: 5
Views: 938

Re: Conflicts when using a USB Hub and Audio Adaptors

what kind of 'audio adapters' are you using? Why do you need three of them? Maybe all of them are reporting the same ID to the host .... what's the output of lsusb The adaptors are these https://www.modmypi.com/raspberry-pi/accessories/xbmc-media-and-sound/usb-sound-adapter-for-the-raspberry-pi/?se...
by TerryC65
Wed Jan 04, 2017 4:02 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Conflicts when using a USB Hub and Audio Adaptors
Replies: 5
Views: 938

Conflicts when using a USB Hub and Audio Adaptors

Hi, I've spent a significant part of the Christmas break trying to track down a problem using USB Audio Adaptors via a USB Hub to a Pi Zero. The Hub and the Adaptors were procured from ModMyPi so most of the initial discussion happened there because I suspected the hub or the Adaptors were causing t...
by TerryC65
Fri Nov 11, 2016 1:59 pm
Forum: Graphics, sound and multimedia
Topic: Is it possible to O/P 2 independent audio channels from RPi?
Replies: 8
Views: 2115

Re: Is it possible to O/P 2 independent audio channels from

I've now got this working with two USB Sound Adapters. In case anyone else ever wants to do this; here is what I did: I went to the Tutorial on the Pihut's website, see https://thepihut.com/products/usb-audio-adapter . Having established that my two adapters were Card 3 and Card 4, I used aplay (as ...
by TerryC65
Tue Nov 08, 2016 7:47 am
Forum: Graphics, sound and multimedia
Topic: Is it possible to O/P 2 independent audio channels from RPi?
Replies: 8
Views: 2115

Re: Is it possible to O/P 2 independent audio channels from

Since you're presently using audio from hdmi, you have another, analogue audio interface available via gpio. Using a pi 0 means buying, or building a simple DAC; details are on the forum. Unfortunately, I was told that that wouldn't work when I asked Pimoroni (see my first post). That was my origin...
by TerryC65
Mon Nov 07, 2016 1:11 pm
Forum: Graphics, sound and multimedia
Topic: Is it possible to O/P 2 independent audio channels from RPi?
Replies: 8
Views: 2115

Re: Is it possible to O/P 2 independent audio channels from

OK. Not many responses, so far. However, a guy on our Linux User Group Mailing List has suggested using two USB Sound Cards, such as: https://www.amazon.co.uk/Sabrent-External-Adapter-Windows-AU-MMSA/dp/B00IRVQ0F8/ref=sr_1_3?ie=UTF8&qid=1478523602&sr=8-3&keywords=usb+sound+card . I would also need a...
by TerryC65
Sat Nov 05, 2016 1:41 pm
Forum: Graphics, sound and multimedia
Topic: Is it possible to O/P 2 independent audio channels from RPi?
Replies: 8
Views: 2115

Re: Is it possible to O/P 2 independent audio channels from

I understand the desire to nut out an innovative solution in the most elegant way. However I think you are over doing it trying to provide a solution with a single Pi. Buy another and implement the same solution for the same required result. Can I ask you why (apart from the audio O/P problem) you ...
by TerryC65
Sat Nov 05, 2016 7:34 am
Forum: Graphics, sound and multimedia
Topic: Is it possible to O/P 2 independent audio channels from RPi?
Replies: 8
Views: 2115

Re: Is it possible to O/P 2 independent audio channels from

There's probably a neater way to do it, in software, but my first thought would be to use a relay to switch between speaker-pairs - just so long as you don't want both bells and organ at the same time. That's the rub, the chimes will ring all the time, even when there is a service in the Minster. T...
by TerryC65
Fri Nov 04, 2016 12:00 pm
Forum: Graphics, sound and multimedia
Topic: Is it possible to O/P 2 independent audio channels from RPi?
Replies: 8
Views: 2115

Is it possible to O/P 2 independent audio channels from RPi?

Hi, I have a project ongoing to simulate the chimes from a Minster bell tower in the replica Model Town across the road. I have the whole thing working at the moment, using an RPi Zero running Python and playing through mpg321. The sound is picked up from the HDMI connector and amplified before bein...
by TerryC65
Tue Oct 18, 2016 12:15 pm
Forum: Raspbian
Topic: Running Raspbian 'Live'
Replies: 2
Views: 1418

Re: Running Raspbian 'Live'

If you mean 'Live' like the "live cd's" that use squashfs overlay Like heater talks about in the 'Raspbian with Read-only Root' hear I don't get the point of running from RAM when you can have a write protected root and an overlay file system. ... I think i read that berryboot used/uses squashfs ec...
by TerryC65
Tue Oct 18, 2016 11:30 am
Forum: Raspbian
Topic: Running Raspbian 'Live'
Replies: 2
Views: 1418

Running Raspbian 'Live'

Hi, Is there such a thing as a 'Live' Raspbian installation. By that I mean that the distro is read from the SD card into RAM and then everything runs from memory. The reason I would like to use this is that I am currently working on a Project using a Pi Zero to ring the bells in a Model Town Minste...
by TerryC65
Sat Mar 26, 2016 11:21 am
Forum: Troubleshooting
Topic: Pi 3 Bluetooth Driver Not Quite Working
Replies: 1
Views: 580

Pi 3 Bluetooth Driver Not Quite Working

Hi, Are there still known issues with the Bluetooth driver on the Raspberry Pi 3? It was mentioned in the Pi 3 edition of MagPi that the driver wasn't yet finished at that time. We have just spent quite a few hours trying to pair and connect a keyboard and mouse (Tecknet X366 and BC309 respectively)...
by TerryC65
Thu Mar 03, 2016 3:05 pm
Forum: Troubleshooting
Topic: RPi 3 and a (Lowish) Resolution Monitor
Replies: 2
Views: 788

Re: RPi 3 and a (Lowish) Resolution Monitor

Replying to myself.... After I had booted into Raspi.Config using the iiyama monitor, I let it write Raspbian to the SD Card and checked that it booted OK. I thn reconnected the HP monitor and it worked, so presumably the issue lies with the graphics recognition in NOOBS 1.8, when run in an RPi 3. S...
by TerryC65
Thu Mar 03, 2016 2:03 pm
Forum: Troubleshooting
Topic: RPi 3 and a (Lowish) Resolution Monitor
Replies: 2
Views: 788

RPi 3 and a (Lowish) Resolution Monitor

Hi, I received my RPi 3 today and tried it out using the same hardware setup that I've previously used for the RPi 2 and Zero, eg HP w1907s monitor (resolution 1440x900) with an HDMI to VGA adaptor, a wired mouse and a wired keyboard. The red LED illuminated, but there was zero activity from the oth...
by TerryC65
Wed Feb 10, 2016 12:17 pm
Forum: Raspbian
Topic: STICKY: Jessie (now defunct and replaced with Stretch) Q&A
Replies: 396
Views: 221701

Re: Jessie Q&A

[/quote]That paragraph is about changes in Scratch. See viewtopic.php?f=77&t=135720 for a bit more detail[/quote]

Thanks. I wasn't sure.
by TerryC65
Wed Feb 10, 2016 10:44 am
Forum: Raspbian
Topic: STICKY: Jessie (now defunct and replaced with Stretch) Q&A
Replies: 396
Views: 221701

Re: Jessie Q&A

In the latest blog entry about the upgrades to Jessie, a brief mention is made of the less important changes. Tantalising for me was the statement '.... basic PWM support in the GPIO server, and ....'. I am currently working through a project using PWM with RPi.GPIO, so would be interested to see mo...
by TerryC65
Wed Jun 10, 2015 8:24 am
Forum: Python
Topic: STICKY: Python Usage Guide
Replies: 27
Views: 87565

Re: Python Usage Guide

croston wrote:I am currently writing a mechanism for RPi.GPIO not to require root permissions.
Excellent!

Also, thanks to Joan and Dougie for explaining things.
by TerryC65
Tue Jun 09, 2015 12:27 pm
Forum: Python
Topic: STICKY: Python Usage Guide
Replies: 27
Views: 87565

Re: Python Usage Guide - Using GPIO

You need root access to access memory and most modules access the gpios as memory mapped devices for performance reasons. OK. So in other words the GPIO is directly mapped to memory to provide the best speed. Is that right? That's why Dougie, in his earlier response says that putting the user into ...
by TerryC65
Tue Jun 09, 2015 11:07 am
Forum: Python
Topic: STICKY: Python Usage Guide
Replies: 27
Views: 87565

Re: Python Usage Guide - Using GPIO

Ben, In your Advanced User Guide, under the heading 'GPIO' you state: To control the GPIO pins you'll need root access, so run sudo python, sudo ipython or sudo idle &. Can I ask why this is? It seems to make life difficult and seems to go against everything I've ever known about not running anythin...
by TerryC65
Sat May 09, 2015 3:05 pm
Forum: General discussion
Topic: problem with raspberrypi-net-mods
Replies: 7
Views: 7574

Re: problem with raspberrypi-net-mods

Did you ever figure out which thing specifically to install to get just the "panel changes" ? Can this, maybe, be deduced by looking at "dpkg -l" of a "patched" system? Only by guesswork and a somewhat faulty memory. I recall that the additional packages were related to Sonic Pi, but I think the ke...
by TerryC65
Sat May 09, 2015 12:07 pm
Forum: General discussion
Topic: problem with raspberrypi-net-mods
Replies: 7
Views: 7574

Re: problem with raspberrypi-net-mods

I have tried purging the network interface package and re-installing after purging wpa-gui, but no joy. I see that there are a couple of network related plugins for the Panel where the icon should be, but neither provide the new icon. So how can I add the new network icon? Replying to myself. I hav...

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