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by Knightlorish
Tue Feb 21, 2017 2:28 pm
Forum: Other projects
Topic: Desoldering station/gun recommendations
Replies: 3
Views: 1005

Desoldering station/gun recommendations

I'm looking to buy a desoldering station for through-board components on older PCBs (e.g. ZX Spectrum). The main job will be to remove non-socketed ICs without damaging either the board or the component. I've used desoldering pumps and braid for many years with sometimes limited success (particularl...
by Knightlorish
Thu Jul 21, 2016 7:15 pm
Forum: Off topic discussion
Topic: PCB question
Replies: 10
Views: 3495

Re: PCB question

plugwash: that's just brilliant and you don't even have the board in front of you. I did think that the upper socket had been cut for a reason but didn't spot the offset and I'll blame it on being tired. I'd assumed that the plug was directly beneath the CPU socket and it's not. You're correct. See ...
by Knightlorish
Mon Jul 11, 2016 7:28 pm
Forum: Off topic discussion
Topic: PCB question
Replies: 10
Views: 3495

Re: PCB question

drgeoff thanks for your suggestion; it's an elegant solution.

All: thanks for taking the time and for your help.
by Knightlorish
Sun Jul 10, 2016 7:58 pm
Forum: Off topic discussion
Topic: PCB question
Replies: 10
Views: 3495

Re: PCB question

Apologies for the image quality, I stumbled over the 64k upload limit. The imgur tip is very helpful and appreciated. plugwash - thanks; that sounds within my abilities. The images, above and below the PCB are http://imgur.com/68TvSu0 and http://imgur.com/DVs0sQf The board is a RAM expansion board t...
by Knightlorish
Sun Jul 10, 2016 4:57 pm
Forum: Off topic discussion
Topic: PCB question
Replies: 10
Views: 3495

PCB question

I have an Aries B32 RAM expansion board for the Beeb. Ah, nostalgia. From the two attached pictures showing front and back, I'm hoping that someone can help. A few of the pins on the back are broken at the bottom where the extended socket plugs into the main board's CPU socket. Without manhandling i...
by Knightlorish
Tue Mar 29, 2016 9:42 pm
Forum: Official Foundation Display
Topic: v1.1 controller board
Replies: 14
Views: 3808

Re: v1.1 controller board

I'm late to the party on this one but oh dear. I bought two displays soon after release but didn't get around to using them until recently and don't I feel stupid now. I was a little alarmed at how bright the display was since the projects I'd planned would be used in all light conditions. Up to dat...
by Knightlorish
Sat Mar 12, 2016 7:02 pm
Forum: Camera board
Topic: Turning off camera LED
Replies: 22
Views: 32736

Re: Turning off camera LED

I'll quickly answer my own question in case it helps anyone else. There was a bug and it's fixed by 'sudo rpi-update', with the caveats, for a firmware update. I had a camera in a binocular eyepiece and definitely needed the LED off. See https://www.raspberrypi.org/forums/viewtopic.php?p=922799#p922...
by Knightlorish
Sat Mar 12, 2016 6:46 pm
Forum: Camera board
Topic: Turning off camera LED
Replies: 22
Views: 32736

Re: Turning off camera LED

I've found with Jessie that disable_camera_led=1 in config.txt disables the camera: cue some frustration dismantling camera from Pi in carefully placed Pi.

Is there a simple way to disable the camera LED using the current Jessie?
by Knightlorish
Wed Jul 08, 2015 10:37 pm
Forum: Troubleshooting
Topic: Raspberry Pi 2 defective?
Replies: 3
Views: 947

Re: Raspberry Pi 2 defective?

I've been having a similar problem and it's frustrating having spent a long time in the comfort of Pi 1s and astonishingly robust reliability. Perhaps I was remarkably lucky on my choice of SanDisk 16GB class 10 SD cards (SanDisk Ultra 30 MB/s) for several Pi 1s. For the Pi 2s, I've imaged several n...
by Knightlorish
Sun Nov 03, 2013 7:55 pm
Forum: Beginners
Topic: Cloning SD Card
Replies: 16
Views: 6769

Re: Cloning SD Card

Before running the backup, create a blank text file named whateveryouwant .img in the location that you wish to create the SD card backup. The .img extension is important. Now when you run Win32 Disk Imager, browse to the newly-created blank .img file and then click READ. The failed to check error ...
by Knightlorish
Sun Nov 03, 2013 6:57 pm
Forum: Beginners
Topic: Cloning SD Card
Replies: 16
Views: 6769

Re: Cloning SD Card

I couldn't get Win32 Disk Imager to "see" my internal SD card reader (possibly due to both its vintage and inability to read a large SDHC). I solved it by buying an external USB3 SDHC card reader (Betron) and I've not had a problem with Win32 Disk Imager since then.
by Knightlorish
Fri Sep 27, 2013 10:56 pm
Forum: Troubleshooting
Topic: Strange Time Issue - Gnuplot [Solved]
Replies: 5
Views: 2506

Re: Strange Time Issue - Gnuplot [Solved]

Thanks for this post and for including the solution. I was looking for a means of graphing data without resorting to php, queries and curly brackets and this steered me towards gnuplot. Running a bash/gnuplot script via Crontab and transferring the graphic output to /var/www means that I am finally ...
by Knightlorish
Tue Sep 17, 2013 7:31 pm
Forum: General discussion
Topic: Import Error
Replies: 10
Views: 3366

Re: Import Error

Say the program with the RPi.GPIO import is called "blah.py". If you execute it with "python blah.py" then it will generate the import error,

import RPi.GPIO as GPIO
ImportError: No module named RPi.GPIO

If you execute it with "sudo python.blah" then it won't.
by Knightlorish
Fri Aug 16, 2013 12:02 am
Forum: Beginners
Topic: GPIO output state after CTRL-C
Replies: 3
Views: 1016

Re: GPIO output state after CTRL-C

Thanks to both of you for prompt and helpful responses. The fact that the output states are "remembered" between executions surprised me and I thought I might just be going mad or had maimed a Pi but I'm now wiser and the risk of a runaway motor has been averted.
by Knightlorish
Wed Aug 14, 2013 11:25 pm
Forum: Beginners
Topic: GPIO output state after CTRL-C
Replies: 3
Views: 1016

GPIO output state after CTRL-C

Hello all, I've attached some simple Python below to illustrate something that I don't understand in respect of GPIO output. The code lights one LED, extinguishes it, lights another LED, extinguishes it and starts over. If I CTRL-C, or say if there were an error in the code, then the try statement e...
by Knightlorish
Mon Jul 22, 2013 4:07 pm
Forum: Camera board
Topic: Streaming Raspberry Pi Camera H264 into HTML over RTMP
Replies: 199
Views: 274176

Re: Streaming Raspberry Pi Camera H264 into HTML over RTMP

This works very nicely with a pc browser but since it's Flash video, it doesn't work with an iPad. I'm trying to get my head around the ffmpeg syntax to see whether it's simple enough to change the output stream to html5 or something else. Has anyone had any success with this?
by Knightlorish
Tue Jul 16, 2013 9:06 pm
Forum: Automation, sensing and robotics
Topic: Chicken Egg Detector
Replies: 26
Views: 7962

Re: Chicken Egg Detector

Is image detection possible using the Pi camera board? Using a general egg shape of the smallest expected size for a match and searching a monochrome image of the nest box (to disregard colour)? Assuming that the egg isn't completely covered in straw, that is. My hens tend to form a nest shape in th...
by Knightlorish
Mon Jul 15, 2013 10:09 pm
Forum: General discussion
Topic: Voltmeter Recommendations
Replies: 11
Views: 2893

Re: Voltmeter Recommendations

I wondered about this too and looked to Adafruit for a recommendation. They suggested the Extech EX330. I sourced it in the UK and so far, so good. It's simple, multi-featured, a good size, auto-ranging and quite robust.
by Knightlorish
Fri Jul 12, 2013 5:39 pm
Forum: Automation, sensing and robotics
Topic: Attaching sprockets and the like to motors
Replies: 2
Views: 854

Attaching sprockets and the like to motors

I've acquired some electric windows motors and the torque, speed, voltage and current requirements are ideal for several projects that I have in mind. The engineering of the motors into the projects has now become the challenge of the day. I've attached a photo of the motor for illustration and woul...
by Knightlorish
Mon Jul 01, 2013 8:30 pm
Forum: Automation, sensing and robotics
Topic: Bench power supply
Replies: 4
Views: 2719

Bench power supply

I'd like to buy a bench power supply for the multitude of projects that the Pi is causing to appear in my head. It's mainly to properly test circuits, both analogue and digital, to determine that they are safe before they get anywhere near the GPIO pins or the Arduino. What do the wise recommend? I'...
by Knightlorish
Fri Jun 28, 2013 10:41 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi to toggle 3-way valve
Replies: 3
Views: 1693

Re: Raspberry Pi to toggle 3-way valve

The PiFace is useful for the two relays to see how it all works but it needs some soldering to break out the GPIO pins to enable a 1-wire temperature sensor such as the DS18B20; it's only replacing the Pi header with longer pins and PiFace said that they'd be releasing a stackable version at some po...
by Knightlorish
Fri Jun 21, 2013 10:35 pm
Forum: Automation, sensing and robotics
Topic: Specifying the correct motor
Replies: 3
Views: 1340

Re: Specifying the correct motor

Thanks very much for taking the time to reply. The window motor seems like a great idea and it's very capable too. Can you suggest a suitable motor controller since I'm still embarassingly new to this. Would it be best to buy an Arduino motor controller and step-up from 3V3 to 5V logic? Is using opt...
by Knightlorish
Fri Jun 21, 2013 4:45 pm
Forum: Automation, sensing and robotics
Topic: Specifying the correct motor
Replies: 3
Views: 1340

Specifying the correct motor

The first Pi project for me appears simple but I'm stumbling at the basic level and hope someone can give me a hint. I'm planning to open and close a blind that has a rotating input shaft that is currently rotated by a removable crank handle. The blind is 30 feet long; to give some idea of scale, an...

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