Raspberry Pi Forums

boyoh

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 I have to disagree with this idea for the simple reason that it supposes that the battery voltage of the 6V battery pack wil...

boyoh

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.

boyoh

I think some of the answers to the questions Get to technical for someone with little electronic Knowledge. It is best to encourage them to build very Simple electronic circuits first. Build a simple circuit on a breadboard,,learn How it works.Then design a program to run it If the project won't wor...

boyoh

The photo showing is a very clear photo Of the problem. It might a good idea to Send a copy to the supplier .You might Be lucky and they send you a replacement They will only scrap it , as it would cost more For a technician to repair it. (Nothing Ventured Nothing Gained ) Best.Of luck Regards BoyO...

boyoh

There are a few things to take into consideration When running your Pi off a battery' Are you just using it as a standby feed For if your 5vdc mains adapter fails. Your battery must be at least 6v 1.5amp Re-chargeable, to cover the load you might Take off the Pi, How do you intend to Charge the batt...

boyoh

Here are some pics: http://www.caimanwebdesign.com/Images/pi4.JPG http://www.caimanwebdesign.com/Images/pi1.JPG http://www.caimanwebdesign.com/Images/pi2.JPG And here it is inside the case from AdaFruit. With how much the left end of the GPIOs stick up, getting a GPIO cable through the slit might p...

boyoh

Arise when you try to plug in a 26pin ribbon Cable, some push down pressure is needed, This might push the pins off the printed Circuit board, Don't push it down with A screw driver With a single-sided or home-made board, there would be a real concern that pressure on an improperly seated connector...

boyoh

My advice is return the Pi, a problem might
Arise when you try to plug in a 26pin ribbon
Cable, some push down pressure is needed,
This might push the pins off the printed
Circuit board, Don't push it down with
A screw driver

boyoh

Do you know anything about Electronics When you said building "SIMPLE" circuits to control Motors ,I assume you do.Then it should be easy to Pick the components you want Hey, come on now. How unhelpful a reply is this? Sorry if I was a bit harsh with the Post, But when you know how much the poster ...

boyoh

Do you know anything about Electronics
When you said building "SIMPLE" circuits to control
Motors ,I assume you do.Then it should be easy to
Pick the components you want

boyoh

Full venue " The RASPBERRY Pi DANCE BAND "
Will be playing all Night

Tickets At The Door

boyoh

The 12v relay contacts should support 220ac
The relay contacts are isolated from the
Relay 12v, Just keep the load with in the
Contacts current rating

boyoh

This opto isolator circuit will give total
isolation between the Pi voltage and the
relay 12v, no need to common the Ground 0-v

boyoh

You want to energize your Pi from the Solar panel What is the max voltage and current output From the Solar panel in bright sunlight Do you intend to charge a battery and use the Battery to feed your Pi. At the moment are you doing manual switching. If you use a battery ,you must monitor the battery...

boyoh

Take a tip from me, on NO account try to
Solder wires on the Pi PCB, unless you
Are very combatant with a soldering Iron.
If you do , clamp a heat sink on the component
And use a low power soldering iron with a
Pin point tip, To much heat will destroy
The component

boyoh

hope you have a good circulating pump on your heating system I'm no plumber, But will it keep handling the sudden changes In circulating pressure,due to valves opening and closing. You might save on gas cost, but have thought about your Electricity bill, I hope you have great success with your project

boyoh

Thanks very much, We are pals now
Keep on posting......Regards BoyOh

boyoh

Don't worried to much about the nuts & bolts
Just learn how to use It. It was designed
At University, you will learn more about it
If you build some electronic projects then
Program them

boyoh

Yes I agree it is a crap diagram
I'm 82 years old my hand was shaking
I think yours will shake when your my age

They are not wires to the relay, just underlining
The the terminal markings,
If they were wires you should have asked were
They come from,

boyoh

This will help you to understand the relay operation Witch contacts are made ,when the relay is energized ( ON ) And witch contacts are made when the relay is De energized ( OFF) I hope have it all correct, If not I will get some stick from some one

boyoh

The relay used in diagram is a sealed unit
BT Type 47 Relay with built in protection diode.
It is ment to plug in to DIL socket or PCB or
strip board

boyoh

Maplins Electronics Sujest mounting relay & transistor on strip board Code N18AW Nominal Voltage 5VDC Coil resistance 125Ω Nominal operating current 40mA Max allowable voltage 9.8 VDC Switching capacity 2A @ 30VDC Dimensions 20 x 10 x 9.9mm

boyoh

Maplins Electronics

Sujest mounting relay & transister on strip board

Code N18AW
Nominal Voltage 5VDC
Coil resistance 125Ω
Nominal operating current 40mA
Max allowable voltage 9.8 VDC
Switching capacity 2A @ 30VDC
Dimensions 20 x 10 x 9.9mm

boyoh

The problem you are experiencing Is contact bounce , creating multable Pulses, this is very common when Using mechanical push switches On digital circuits. To over come this Use a de Bounce circuit across the Push switch, on first contact this will Stretch the pulse for longer than Any contact bounc...

boyoh

Rig this circuit on a breadboard.
Get some experience on using
Field- Effect transistors ( FETs)
Best to start with simple circuits.
You will learn how they work

Search found 1466 matches

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

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

Re: Control a simple DC-Motor

Re: Should I return my Pi? GPIO pins sit crooked.

Re: turn on and shudown down batterry level

Re: Should I return my Pi? GPIO pins sit crooked.

Re: Should I return my Pi? GPIO pins sit crooked.

Re: Should I return my Pi? GPIO pins sit crooked.

Re: Need recommendations on GPIO wiring kits

Re: Need recommendations on GPIO wiring kits

Re: Leeds?

Re: how can do a Raspberry to trigger a 12VDC relay?

Re: how can do a Raspberry to trigger a 12VDC relay?

Re: Input Voltage selector / switcher required

Re: Power supply possibilities

Re: Room by Room central heating control

Re: Need help choosing a Normally Closed, 9VAC relay.

Re: Raspberrypi is open hardware??

Re: Need help choosing a Normally Closed, 9VAC relay.

Re: Need help choosing a Normally Closed, 9VAC relay.

Re: Need help choosing a Normally Closed, 9VAC relay.

Re: Need help choosing a Normally Closed, 9VAC relay.

Re: Need help choosing a Normally Closed, 9VAC relay.

Re: GPIO simple switch woes

Re: Help Starting LED Matrix