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by jimallyn
Sat Feb 14, 2015 8:18 pm
Forum: General discussion
Topic: Need some help for using triac with a raspberry
Replies: 12
Views: 1494

Re: Need some help for using triac with a raspberry

could you tell me if P11N60 is a photo triac? No, it is not. It's a high voltage power mosfet. It will not work for switching AC power, only DC power. Are you planning to use standard incandescent bulbs? Xenon flash tubes? LEDs? You still haven't given us enough information to determine what you ne...
by jimallyn
Sat Feb 14, 2015 2:47 am
Forum: Advanced users
Topic: Separate Switching Regulator for Pi Power?
Replies: 4
Views: 833

Re: Separate Switching Regulator for Pi Power?

Most switching regulators are pretty well regulated, and respond quickly to changes in load. Unless you plan to switch all of the LEDs on or off at the same time, I wouldn't think it would be a problem, and even then it might not be a problem.
by jimallyn
Fri Feb 13, 2015 9:40 pm
Forum: General discussion
Topic: Need some help for using triac with a raspberry
Replies: 12
Views: 1494

Re: Need some help for using triac with a raspberry

Can you give us more specific information on what you are referring to as a "flash light"? What you need to trigger your light will vary depending on exactly what kind of light you're talking about.
by jimallyn
Fri Feb 13, 2015 8:01 pm
Forum: Other projects
Topic: Pi Near Space
Replies: 6
Views: 1475

Re: Pi Near Space

Amateur Radio operators (hams) have sent cameras up on balloons many times. A little Googling would probably turn up LOTS of information on it.
by jimallyn
Fri Feb 13, 2015 7:50 pm
Forum: Python
Topic: Generat Interrups with LDR
Replies: 5
Views: 898

Re: Generat Interrups with LDR

Have you verified that the LDR will change resistance enough to detect from a LED blinking? Might be better off using a phototransistor.
by jimallyn
Fri Feb 13, 2015 7:47 pm
Forum: General discussion
Topic: know any US suppliers with RASPI 2 in stock?
Replies: 6
Views: 745

Re: know any US suppliers with RASPI 2 in stock?

You might try MCM Electronics.
by jimallyn
Fri Feb 13, 2015 7:38 am
Forum: Automation, sensing and robotics
Topic: point to point distance tracking in a room
Replies: 8
Views: 1436

Re: point to point distance tracking in a room

GPS won't be accurate enough, inside or out. My GPS receiver shows the error margin, and I think the best I've ever seen is +/- 9 feet. That's outside with good signals. I understand GPS can provide better accuracy than that, but unless you have a high end GPS intended for surveying or the military,...
by jimallyn
Thu Feb 12, 2015 10:57 pm
Forum: Advanced users
Topic: 4 pin RGB LED
Replies: 19
Views: 4245

Re: 4 pin RGB LED

If the LED came with the Canakit, it should have documentation on it in the kit. If not, check their website, or contact them for more information. Or you can figure it out yourself: try applying a low voltage through a resistor to the leads in various combinations until you figure it out.
by jimallyn
Thu Feb 12, 2015 10:54 pm
Forum: Other projects
Topic: A question about business use
Replies: 8
Views: 1421

Re: A question about business use

Microsoft has already released Office for ARM processors. You guys don't get out much, do you? While I consider it a waste of time to do so, I suspect someone will get Office running on an RPi2, if not now, then when there is a version of Windows for RPi. If it can be done, the geeks will do it.
by jimallyn
Thu Feb 12, 2015 10:29 pm
Forum: Beginners
Topic: Can the RPi be kept always-on? any standby mode?
Replies: 13
Views: 5869

Re: Can the RPi be kept always-on? any standby mode?

I got my RPi from Canakit, too. Didn't use the heat sink.
by jimallyn
Thu Feb 12, 2015 9:21 pm
Forum: Beginners
Topic: How to hook up a power LED?
Replies: 11
Views: 3491

Re: How to hook up a power LED?

You will definitely want to put a resistor in series with the LED. Otherwise, you could draw too much current from the GPIO and destroy the processor. If you don't have specs on the LED you want to use, you should start with a higher value resistor, then work down in value until the LED is as bright...
by jimallyn
Thu Feb 12, 2015 8:19 am
Forum: Other projects
Topic: Data Acquisition
Replies: 1
Views: 1986

Re: Data Acquisition

The Raspberry Pi does not have any analog to digital converters in it, but they could be added via the GPIO port. This page shows a chip that you can interface to the RPi, and has links to a Python program to read from the ADC: https://learn.adafruit.com/reading-a-analog-in-and-controlling-audio-vol...
by jimallyn
Thu Feb 12, 2015 7:51 am
Forum: Beginners
Topic: Can the RPi be kept always-on? any standby mode?
Replies: 13
Views: 5869

Re: Can the RPi be kept always-on? any standby mode?

My Pi has been powered up continuously since I got it several months ago. I don't know anything about a standby mode, but that doesn't necessarily mean there is no such thing.
by jimallyn
Thu Feb 12, 2015 6:14 am
Forum: Troubleshooting
Topic: audio recording
Replies: 10
Views: 1384

Re: audio recording

I did a little Googling for CM108. The CM108 is an integrated circuit, not a sound card, and it does not have a line input, it only has a mic input. If your interface has a line input, then it must have additional circuitry in it for the line input. Is there a manufacturer name and/or model number o...
by jimallyn
Thu Feb 12, 2015 12:56 am
Forum: Media centres
Topic: Where can i download OSMC
Replies: 10
Views: 5719

Re: Where can i download OSMC

antonbruhn wrote:found it now and i IT works fine!
If you found it, please post the link to it here. I spent about 20 minutes looking for it and was unsuccessful.
by jimallyn
Thu Feb 12, 2015 12:50 am
Forum: Other projects
Topic: SPACE
Replies: 9
Views: 1126

Re: SPACE

I suggested you visit AMSAT because they have put over 70 satellites into orbit, beginning in 1961, and continuing to this day. They have a lot of experience with amateur built satellites, and you could probably learn a lot from them. For example, most satellites use radiation-hardened processors, b...
by jimallyn
Wed Feb 11, 2015 10:03 pm
Forum: Other projects
Topic: SPACE
Replies: 9
Views: 1126

Re: SPACE

Amateur radio operators (hams) have built and deployed many satellites. You might check these websites:

http://amsat-uk.org

http://www.amsat.org
by jimallyn
Wed Feb 11, 2015 9:39 pm
Forum: Other projects
Topic: A question about business use
Replies: 8
Views: 1421

Re: A question about business use

Doug, that's why I italicized might. There are currently people using LibreOffice on the Pi, so maybe Microsoft Office will run on the Pi. Surely there will be people who try it.
by jimallyn
Wed Feb 11, 2015 8:13 pm
Forum: Other projects
Topic: A question about business use
Replies: 8
Views: 1421

Re: A question about business use

The Raspberry Pi probably won't be of much use to your company for the things you mentioned. I couldn't find anything on the Tally website that suggest they have a Linux version, and even if they did, they probably would not have a version compiled for the ARM processor the Pi uses. MS Office will n...
by jimallyn
Wed Feb 11, 2015 7:58 pm
Forum: Troubleshooting
Topic: audio recording
Replies: 10
Views: 1384

Re: audio recording

Electric guitars typically put out enough to drive a line level input, but the pickups are fairly high impedance, so plugging them into a low impedance input will cut their output markedly. Do you have the input impedance specs for your sound card? Does the sound card have an input specifically conf...
by jimallyn
Tue Feb 10, 2015 9:42 am
Forum: Troubleshooting
Topic: Running Python Script In LXTerminal
Replies: 6
Views: 909

Re: Running Python Script In LXTerminal

I am unable to read the text in your image. What are you trying to show us?
by jimallyn
Mon Feb 09, 2015 9:33 am
Forum: Python
Topic: Make Learning Python Easy ?
Replies: 10
Views: 2302

Re: Make Learning Python Easy ?

I have been learning Python from "Hello world! : computer programming for kids and other beginners" by Warren and Carter Sande. I've done a bunch of programming before, but never in Python, and this book is a great introduction to Python. I've heard that there are a lot more libraries available for ...
by jimallyn
Mon Feb 09, 2015 3:15 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi + 433Mhz RF Transmitter + Receiver
Replies: 3
Views: 2403

Re: Raspberry Pi + 433Mhz RF Transmitter + Receiver

Sure, you can do serial data in and out via the GPIO port. See for example:

http://elinux.org/RPi_Serial_Connection
by jimallyn
Sat Feb 07, 2015 12:08 am
Forum: Graphics, sound and multimedia
Topic: How to stream Pi audio over the internet?
Replies: 12
Views: 10062

How to stream Pi audio over the internet?

I am looking for a way to stream audio played or generated on the RPi over the internet. I have found several articles on a RPi baby monitor, but that is for taking an external audio source like a microphone and streaming that. That's not what I want to do. Some background: I have been using my RPi ...

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