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by AdamDynamic
Sat May 07, 2016 3:24 pm
Forum: Beginners
Topic: Transistor switch to short a camera switch - resistor values
Replies: 8
Views: 1832

Re: Transistor switch to short a camera switch - resistor va

You need at least a wire from raspberrys GND to the emitter. How should (otherwise) the base-current find it's way back? But be aware of potential-differences if there are other connections between camera and raspberry. (May be via a common powersupply or what ever.) You could also think about an i...
by AdamDynamic
Sat May 07, 2016 1:37 pm
Forum: Beginners
Topic: Transistor switch to short a camera switch - resistor values
Replies: 8
Views: 1832

Transistor switch to short a camera switch - resistor values

Hi, I'm hoping someone can help me? I'm trying to trigger an old camera using the GPIO pins on my Raspberry Pi B+, in order to trigger the shutter I just need to short two contact points on the switch (I've already soldered two wires to the contacts and connected them to a perfboard). To short the s...
by AdamDynamic
Tue Apr 26, 2016 10:14 pm
Forum: General discussion
Topic: PCB Standoffs - 16mm versions in the UK?
Replies: 8
Views: 1737

PCB Standoffs - 16mm versions in the UK?

Hi, Does anyone know where I can get 16mm M2.5 PCB standoffs/spacers in the UK? I have a Pi project with a model A+ and two or three boards stacked on top of it (a sense hat, a PITS tracker and a proto-board). In order that the GPIO pins don't get damaged I want to use standoffs (I need 16mm as I'm ...
by AdamDynamic
Wed Jan 20, 2016 9:27 pm
Forum: Other projects
Topic: Raspberry Pi-controlled Relay/Switch - low power options?
Replies: 7
Views: 2024

Re: Raspberry Pi-controlled Relay/Switch - low power options

Adam, I think we need more info.. mechanical camera? Relay? Do you want to trigger a physical button? Is it an electronic trigger? We just don't have enough information. If you are worried about brownouts.. some capacitors and diodes can possibly isolate portions of your circuit. Have you done powe...
by AdamDynamic
Tue Jan 19, 2016 9:30 pm
Forum: Other projects
Topic: Raspberry Pi-controlled Relay/Switch - low power options?
Replies: 7
Views: 2024

Re: Raspberry Pi-controlled Relay/Switch - low power options

Hi All, Thanks for your replies! The relays (or equivalents) would be doing one of two things: 1) Actuating a film camera so momentary and no more than 15 times in the life of the batteries. 2) Turning a bulb on or off (when on it would need to stay on for 10/15 mins for example). This would take pl...
by AdamDynamic
Mon Jan 18, 2016 10:51 pm
Forum: Other projects
Topic: Raspberry Pi-controlled Relay/Switch - low power options?
Replies: 7
Views: 2024

Raspberry Pi-controlled Relay/Switch - low power options?

Hi, I'm hoping someone here can help me? I'm relatively new to the 'hardware' side of RPi development so if this is a stupid question please forgive me! I need to use the GPIO pins on a Raspberry Pi Model A+ to turn a couple of switches on and off. My problem is that the RPi needs to be battery powe...
by AdamDynamic
Wed Nov 18, 2015 8:24 am
Forum: Python
Topic: Creating a full-screen slideshow with finite repetitions
Replies: 3
Views: 5062

Re: Creating a full-screen slideshow with finite repetitions

Search on here for Ken T's PiPresents. The code can be downloaded from https://github.com/KenT2?tab=repositories (you probably want V1.2 aka PiPresents-Next) Thanks for the reply! I don't think I've ever seen a github repository with so much documentation :) Might be a bit 'heavyweight' for my need...
by AdamDynamic
Wed Nov 18, 2015 12:56 am
Forum: Python
Topic: Creating a full-screen slideshow with finite repetitions
Replies: 3
Views: 5062

Creating a full-screen slideshow with finite repetitions

Hi, I've been googling this problem for most of the evening and I think I'm starting to go around in circles, hopefully someone here can help point me in the right direction :) I'm trying to create a full-screen slideshow in Python. The list of images displayed needs to be dynamic though so my appro...
by AdamDynamic
Tue Nov 17, 2015 11:34 pm
Forum: Beginners
Topic: Auto-login to Pi on boot - inittab file doesn't exist?
Replies: 2
Views: 800

Re: Auto-login to Pi on boot - inittab file doesn't exist?

sudo raspi-config has the options to auto login to a command line or auto-login to a GUI desktop. Auto starting programs on the command line (from cron or /etc/rc.local possibly with screen) or on the GUI (from the /home/pi/.config/lxsession/LXDE-pi/autostart) file is a FAQ on here. This worked per...
by AdamDynamic
Tue Nov 17, 2015 9:20 pm
Forum: Beginners
Topic: Auto-login to Pi on boot - inittab file doesn't exist?
Replies: 2
Views: 800

Auto-login to Pi on boot - inittab file doesn't exist?

Hi, I'm in the process of building a photobooth for a wedding using a Raspberry Pi, I have the script required to take the photos etc, I just need to configure the Pi such that all I need to do is plug it in and the program will run automatically and be ready for users to use. I'm extremely new to a...
by AdamDynamic
Mon Nov 16, 2015 1:08 pm
Forum: Beginners
Topic: GPIO pins - act as momentary switch?
Replies: 6
Views: 2091

Re: GPIO pins - act as momentary switch?

Hmm, hadn't considered the risks of connecting the Pi to the projector itself. Looks like a relay or an optoisolator might be the way forward - is there any steer on which is easier for a complete beginner? Also, a second consideration is that I need to build this before the end of the week (I'm get...
by AdamDynamic
Mon Nov 16, 2015 8:41 am
Forum: Beginners
Topic: GPIO pins - act as momentary switch?
Replies: 6
Views: 2091

GPIO pins - act as momentary switch?

Hi, I'm hoping someone here can help me? I have a old 35mm slide projector that I would like to create an interval timer for using my Pi. My quick-and-dirty approach is to use the projector's remote control, connect the contacts of the remote's momentary "next slide" push switch to the GPIO pins (so...
by AdamDynamic
Tue Nov 03, 2015 8:04 am
Forum: Beginners
Topic: Controlling 6 clusters of LEDs - will these schematics work?
Replies: 5
Views: 911

Re: Controlling 6 clusters of LEDs - will these schematics w

Thanks both for your replies! Couple of quick follow-up questions: The dropper resistor (e.g. R1) is calculated as follows: R = (Vs - Vf)/If Vs = supply voltage (5V) Vf = LED forward voltage (typically 2V) If = LED forward current (typically 10 or 20mA) Obviously when you have three LEDs in parallel...
by AdamDynamic
Mon Nov 02, 2015 11:17 pm
Forum: Beginners
Topic: Controlling 6 clusters of LEDs - will these schematics work?
Replies: 5
Views: 911

Controlling 6 clusters of LEDs - will these schematics work?

Hi, I'm in the process of creating a Raspberry Pi photobooth using my Model B, while I have "some" experience in Python programming I'm completely new to the hardware side of things so if these sound like simple questions, please forgive me :) To provide feedback to the user when they take a photo i...
by AdamDynamic
Tue Oct 27, 2015 7:57 am
Forum: Python
Topic: Running script from button press - interrupting other script
Replies: 5
Views: 1359

Running script from button press - interrupting other script

I'm in the process of creating a photobooth using my Raspberry Pi B+ and my very limited Python skills :) So far using Python I've got the RPi to acctuate my Nikon and capture 4 images, assemble them into a strip of photos and then upload them to Dropbox (so far, so good). I want users to be able to...
by AdamDynamic
Mon Oct 19, 2015 9:00 pm
Forum: Beginners
Topic: Wifi dongle - best option in weak signal environments?
Replies: 1
Views: 368

Wifi dongle - best option in weak signal environments?

Hi, I'm fairly new to "all things Raspberry Pi" so if this is an obvious question then please forgive me! I'm in the process of creating a Raspberry Pi-powered photobooth. Rather than display the images on a screen I'm going to upload them to Flickr as people take the photos so they can view the pho...
by AdamDynamic
Wed Oct 07, 2015 8:10 pm
Forum: Beginners
Topic: DSLR Photobooth / Display images on screen via Pi?
Replies: 3
Views: 1371

Re: DSLR Photobooth / Display images on screen via Pi?

gphoto2 might be just what I'm looking for, I'll give it a try - thanks for the help guys!
by AdamDynamic
Tue Oct 06, 2015 10:05 pm
Forum: Beginners
Topic: DSLR Photobooth / Display images on screen via Pi?
Replies: 3
Views: 1371

DSLR Photobooth / Display images on screen via Pi?

I'm in the (very) early stages of a project and I'm hoping someone can tell me whether I'm attempting the impossible or not! :) I'm trying to build a Raspberry Pi powered photobooth. Having done some research I've found a few projects that use the Raspberry Pi camera, I'd really like to use my Nikon...
by AdamDynamic
Tue Oct 06, 2015 7:40 pm
Forum: Beginners
Topic: GPIO Pins - multiple LEDs at the same time?
Replies: 6
Views: 2588

Re: GPIO Pins - multiple LEDs at the same time?

You can connect them to the same ground. You might want to check that you need more than the few mA that a GPIO can provide. My LEDs are too bright when fully on. What do you plan to use them for? E.g. Room lighting, infra red illumination? It's just to back-light a small (i.e. 50p size) piece of a...
by AdamDynamic
Tue Oct 06, 2015 6:19 am
Forum: Beginners
Topic: GPIO Pins - multiple LEDs at the same time?
Replies: 6
Views: 2588

Re: GPIO Pins - multiple LEDs at the same time?

Hi, Thanks both for your fast responses! In terms of using transistors, I had a quick google and found this: http://www.raspberrypi-spy.co.uk/2012/06/control-led-using-gpio-output-pin/ In terms of adding multiple LEDs, is it just as simple as connecting them all to the 5v power supply (pin 2) and th...
by AdamDynamic
Mon Oct 05, 2015 10:34 pm
Forum: Beginners
Topic: GPIO Pins - multiple LEDs at the same time?
Replies: 6
Views: 2588

GPIO Pins - multiple LEDs at the same time?

Hi, I've done some python programming in the past but I'm completely new to the 'hardware' side of things so if this is an obvious question, please forgive me :) I'm trying to make a device driven by a Raspberry Pi. As part of the device I'd like 4 seperate LEDs that illuminate one after the other (...

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