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by boyoh
Sun Nov 10, 2013 11:05 pm
Forum: Staffroom, classroom and projects
Topic: new to raspberry pi - ages of users
Replies: 12
Views: 21859

Re: new to raspberry pi - ages of users

The Pi was designed to learn programming and electronics Ten year olds I think might learn the programming ok, But will struggle with the electronics, as the learning Will entail building circuits on a bread board , Remember the Raspberry Pi is us less with out Something to programme such as electro...
by boyoh
Sat Nov 09, 2013 10:55 pm
Forum: Wanted
Topic: Strip Board like this
Replies: 8
Views: 4921

Re: Strip Board like this

http://www.maplin.co.uk/stripboard-1918 I am after stripboard like the above just without the price tag. All cheaper eBay type board has the strips of copper long ways. I want them across ideally with the gap but not necessary. Normally anything you can find in maplin you can find online but my goo...
by boyoh
Wed Nov 06, 2013 10:50 pm
Forum: Advanced users
Topic: Running Raspberry on 3.3 V
Replies: 33
Views: 24431

Re: Running Raspberry on 3.3 V

I know that is possible to power the raspberry via GPIO, connecting 5V to pin 2 and GND to pin 6. Here's my question now: is it possible to power the raspberry connecting 3.3V to pin 1 and GND to pin 6? Of course I won't be use anything that runs on 5V! For what reason do you want to back feed 3.3v...
by boyoh
Tue Nov 05, 2013 11:13 pm
Forum: General discussion
Topic: Need for Industrial Quality RPi System
Replies: 27
Views: 10960

Re: Need for Industrial Quality RPi System

If you go on with all the modifications to a Raspberry Pi
For it to operate in a industrial environment
You will end up with a PLC with a Raspberry Pi label on it

BoyOh
by boyoh
Mon Nov 04, 2013 11:00 pm
Forum: Beginners
Topic: Starting Out
Replies: 6
Views: 1009

Re: Starting Out

Hello, I am looking for some advice on the Raspberry Pi. Being Googling my head off and information isn't consistent to say the least. I currently do some web design.Looking to try my hand at the Pi. My question is as follows. What exactly do i need to buy to create my own home automation center, t...
by boyoh
Sun Nov 03, 2013 10:33 pm
Forum: Gaming
Topic: Building a portable Raspberry pi
Replies: 17
Views: 10951

Re: Building a portable Raspberry pi

I don't know much about computer gaming
But I know that's the very fast graphics signals
Take a lot of current ,and chip gets very warm.
This puts a lot of drain on the battery.
I think your battery will be a lot bigger than
Your Pi......Best Of luck
by boyoh
Sun Nov 03, 2013 9:57 pm
Forum: Advanced users
Topic: Simple A to D to monitor voltage
Replies: 50
Views: 49761

Re: Simple A to D to monitor voltage

I was actually going to give that simulated analog reading a try this week. I am in the same boat as you red6, I plan on monitoring current and voltage on a 12V solar generator. I have about the same level of knowledge as you do too, so please take my notes below for that, one newb to another newb ...
by boyoh
Sun Nov 03, 2013 3:15 pm
Forum: General discussion
Topic: phone battery pack used as a battery backup
Replies: 11
Views: 3009

Re: phone battery pack used as a battery backup

Why do you want to run your Pi off batteries Is it going to be portable, If so you will need a spare battery What are you going to Run off your Pi, If we know this you might Get better advice, You must take in to Consideration the current your Pi will take Also the load of your project.
by boyoh
Sat Nov 02, 2013 11:23 pm
Forum: Beginners
Topic: P1-01, does it provide 3.3volts or we input 3.3volts
Replies: 8
Views: 3259

Re: P1-01, does it provide 3.3volts or we input 3.3volts

On this post I think we are dealing with To many IF or BUTS and nothing Permanent, Lets use the Pi what It was design for, Learning programming And electronics It will be far safer to input the correct power supply. Build a few electronic circuits then design the programme for them Then if they don'...
by boyoh
Fri Nov 01, 2013 6:46 pm
Forum: Troubleshooting
Topic: Pi powers down when I complete a circuit
Replies: 16
Views: 2516

Re: Pi powers down when I complete a circuit

I = V over R 3.3v
------
200R = 16.5mA
by boyoh
Fri Nov 01, 2013 6:35 pm
Forum: Troubleshooting
Topic: Pi powers down when I complete a circuit
Replies: 16
Views: 2516

Re: Pi powers down when I complete a circuit

boyoh wrote:
caiman wrote:So, how does a person know just how much resistance is needed to prevent a short? Would, say, a single 200ohm resistor placed somewhere in the circuit be enough to prevent a short in my situation?
by boyoh
Fri Nov 01, 2013 6:28 pm
Forum: Troubleshooting
Topic: Pi powers down when I complete a circuit
Replies: 16
Views: 2516

Re: Pi powers down when I complete a circuit

caiman wrote:So, how does a person know just how much resistance is needed to prevent a short? Would, say, a single 200ohm resistor placed somewhere in the circuit be enough to prevent a short in my situation?
by boyoh
Fri Nov 01, 2013 5:56 pm
Forum: Troubleshooting
Topic: Pi powers down when I complete a circuit
Replies: 16
Views: 2516

Re: Pi powers down when I complete a circuit

boyoh wrote:The strength of a current is directly proportional
To the pressure between two points,
But is inversely proportional to its resistance

Your problem In a nut shell (Dead Short ) OHMS LAW
( Unit of Pressure = Volts)
by boyoh
Fri Nov 01, 2013 5:34 pm
Forum: Automation, sensing and robotics
Topic: Electronic interference with a wire from pin
Replies: 12
Views: 1926

Re: Electronic interference with a wire from pin

I think what we are seeing in a lot of post Is a lot of diving in at the deep end with Sensors and motors My advice is build a few simple electronic Circuits on a bread board, then programme Them, Then if they don't work you will know How to test the them, This way you will learn more About electron...
by boyoh
Fri Nov 01, 2013 5:01 pm
Forum: Troubleshooting
Topic: Pi powers down when I complete a circuit
Replies: 16
Views: 2516

Re: Pi powers down when I complete a circuit

Obviously this is some sort of power thing, but I was hoping someone could explain exactly why this happens. And is it to be expected, or is it a problem? It is known technically as a 'short circuit'. The response you are seeing is to be expected. The strength of a current is directly proportional ...
by boyoh
Fri Nov 01, 2013 4:47 pm
Forum: Troubleshooting
Topic: Pi powers down when I complete a circuit
Replies: 16
Views: 2516

Re: Pi powers down when I complete a circuit

The strength of a current is directly proportional
To the pressure between two points,
But is inversely proportional to its resistance

Your problem In a nut shell (Dead Short ) OHMS LAW
by boyoh
Thu Oct 31, 2013 10:57 pm
Forum: Advanced users
Topic: turn on and shudown down batterry level
Replies: 3
Views: 1004

Re: turn on and shudown down batterry level

You could monitor the battery level with a circuit That will tell when a critical level is retched You could use a Zener Diode switching a Opto isolator then the opto isolator transistor Taking the input of the Pi GPIO input pin to a Active High Or active Low depending on the Pull up or pull down re...
by boyoh
Thu Oct 31, 2013 10:35 pm
Forum: Troubleshooting
Topic: Raspberry Pi 6v Help!
Replies: 7
Views: 1364

Re: Raspberry Pi 6v Help!

You will be better off using a 6v 4amp rechargeable sealed battery With a fuse and a diode in the + leg . The diode will drop the voltage Down to 5.4v no need for a regulator, The Pi should tolerate 5.4 volts ok Select the correct size diode ,and protection fuse suggest 1.5 amp glass fuse. (See Joan...
by boyoh
Thu Oct 31, 2013 5:54 pm
Forum: Advanced users
Topic: Simple A to D to monitor voltage
Replies: 50
Views: 49761

Re: Simple A to D to monitor voltage

You could monitor the battery level with a circuit That will tell when a critical level is retched You could use a Zener Diode switching a Opto isolator then the opto isolator transistor taking the input of the Pi GPIO input pin to a Active High Or active Low depending on the Pull up or pull down re...
by boyoh
Tue Oct 29, 2013 10:41 pm
Forum: General discussion
Topic: What to buy / obtain
Replies: 9
Views: 1370

Re: What to buy / obtain

My advice is buy a breadboard and a power supply A few transistors some LEDs a few diodes some resisters A multi meter , A book on building electronic circuits on A breadboard. Then you will understand all the Technical jargon you are given, Best to start from the bottom And get to grips with OHMS ...
by boyoh
Tue Oct 29, 2013 10:38 pm
Forum: General discussion
Topic: What to buy / obtain
Replies: 9
Views: 1370

Re: What to buy / obtain

My advice is buy a breadboard and a power supply A few transistors some LEDs a few diodes some resisters A multi meter , A book on building electronic circuits on A breadboard. Then you will understand all the Technical jargon you are given, Best to start from the bottom And get to grips with OHMS ...
by boyoh
Tue Oct 29, 2013 7:45 pm
Forum: Beginners
Topic: Need help setting up battery supply
Replies: 5
Views: 1255

Re: Need help setting up battery supply

If you want to use a battery to run your Pi And have 12vdc to the bread board for Your projects , this lay out might help When interfacing your Pi with projects Taking more than 3.3v or 5v you must Have some form of isolation to stop Feed back of a higher voltage to The Pi GPIO pins, You could use O...
by boyoh
Tue Oct 29, 2013 3:38 pm
Forum: General discussion
Topic: What to buy / obtain
Replies: 9
Views: 1370

Re: What to buy / obtain

My advice is buy a breadboard and a power supply A few transistors some LEDs a few diodes some resisters A multi meter , A book on building electronic circuits on A breadboard. Then you will understand all the Technical jargon you are given, Best to start from the bottom And get to grips with OHMS L...
by boyoh
Mon Oct 28, 2013 6:27 pm
Forum: General discussion
Topic: reading 2.5v at test points and 5v at the cables. what?
Replies: 17
Views: 2597

Re: reading 2.5v at test points and 5v at the cables. what?

@ boyoh: Relax. It works. A switched mode regulator switches the input voltage at a few tens of kilohertz, thus creating AC. It feeds that through a transformer. (At high frequencies the transformer can be small.) Then it rectifies and smooths the transformer output. There is a feedback arrangement...
by boyoh
Mon Oct 28, 2013 3:50 pm
Forum: General discussion
Topic: reading 2.5v at test points and 5v at the cables. what?
Replies: 17
Views: 2597

Re: reading 2.5v at test points and 5v at the cables. what?

@ boyoh: Relax. It works. A switched mode regulator switches the input voltage at a few tens of kilohertz, thus creating AC. It feeds that through a transformer. (At high frequencies the transformer can be small.) Then it rectifies and smooths the transformer output. There is a feedback arrangement...

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