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by YemSalat
Thu Jul 16, 2015 10:07 am
Forum: Beginners
Topic: Connecting different motors in parallel.
Replies: 10
Views: 783

Re: Connecting different motors in parallel.

You don't need a transistor. Link the Battery supply Ground, the Servo Ground, the Pi Ground and the L298N ground. Apply the Battery Positive to the Servo power and L298N power. Use GPIO pins to provide signals to servo and L298N. Thanks! I want to use the transistor to have an ability to completel...
by YemSalat
Thu Jul 16, 2015 9:13 am
Forum: Beginners
Topic: Connecting different motors in parallel.
Replies: 10
Views: 783

Re: Connecting different motors in parallel.

What sort of transitor? Won't there be quite a lot of current? Have you tried setting enable A/B to logic low? That might cut the residual current a bit, or is the servo the culprit? The transistor I am planning to use is a simple NPN one, here is its datasheet: http://pdf1.alldatasheet.com/datashe...
by YemSalat
Thu Jul 16, 2015 7:41 am
Forum: Beginners
Topic: Connecting different motors in parallel.
Replies: 10
Views: 783

Re: Connecting different motors in parallel.

You don't need a transistor. Link the Battery supply Ground, the Servo Ground, the Pi Ground and the L298N ground. Apply the Battery Positive to the Servo power and L298N power. Use GPIO pins to provide signals to servo and L298N. Thanks! I want to use the transistor to have an ability to completel...
by YemSalat
Thu Jul 16, 2015 6:21 am
Forum: Beginners
Topic: web browser slanted image
Replies: 3
Views: 385

Re: web browser slanted image

Are you sure you're not using any browser extensions / bookmarks / etc. which could do this?
Try using another browser and report back.
by YemSalat
Thu Jul 16, 2015 6:12 am
Forum: Beginners
Topic: Connecting different motors in parallel.
Replies: 10
Views: 783

Connecting different motors in parallel.

Hi everyone! I am currently trying to connect a motor board which drives two gear motors and another servo motor in parallel. Does everything look alright to you on this diagram? (I omitted the gpio wires from the diagram, so its only the power supply) http://i.imgur.com/Dl1xGA4.png (click to enlarg...
by YemSalat
Mon Jun 29, 2015 12:47 pm
Forum: Beginners
Topic: Do I need to connect the battery ground (-) to the Pi GPIO ?
Replies: 2
Views: 546

Re: Do I need to connect the battery ground (-) to the Pi GP

joan wrote:No. The servo will get the 6V from its power supply and the Pi will get 5V from its power supply.

The shared ground is needed to complete the circuit for the control signal going Pi to servo and servo back to Pi.
Got it :) Thanks heaps!
by YemSalat
Mon Jun 29, 2015 10:34 am
Forum: Beginners
Topic: Do I need to connect the battery ground (-) to the Pi GPIO ?
Replies: 2
Views: 546

Do I need to connect the battery ground (-) to the Pi GPIO ?

Hi! I have a servo connected to my Pi. The servo works from 4 AA batteries (6V) it is hooked up with its plus (+) to the battery plus (+), minus (-) to battery's minus (-) and the battery (-) is connected to ground on Raspberry Pi (sorry if its a mouthful) And the PWM pin is hooked up to one of the ...
by YemSalat
Sun Jun 28, 2015 2:40 pm
Forum: Beginners
Topic: GPIO / resistors - electronics beginner question
Replies: 6
Views: 481

Re: GPIO / resistors - electronics beginner question

Thanks for the info! Do you reckon a 220Ohm resistor will do for the npn transistor? (5V on the fan and 3.3V on GPIO that goes to transistor base)
by YemSalat
Sat Jun 27, 2015 3:57 pm
Forum: Beginners
Topic: GPIO / resistors - electronics beginner question
Replies: 6
Views: 481

Re: GPIO / resistors - electronics beginner question

YemSalat wrote:(By the way what do the "3V3-0.7V" mean, sorry I still got a bit confused)
Never mind, misread your post at first now its clear that 3.3V is the pin, but by 'diode forward voltage' - do you mean that the transistor requires at least 0.7V?
by YemSalat
Sat Jun 27, 2015 3:33 pm
Forum: Beginners
Topic: GPIO / resistors - electronics beginner question
Replies: 6
Views: 481

Re: GPIO / resistors - electronics beginner question

the resistor is necessary to limit the current through what is essentially a diode. with a 10K resistor the current flowing is limited to 3V3 - 0.7V (the diodes forward voltage) = 2,6V / 10.000 = 0.26mA. A transistor as switch has a current amplification (that i something different and lower than H...
by YemSalat
Sat Jun 27, 2015 2:44 pm
Forum: Beginners
Topic: GPIO / resistors - electronics beginner question
Replies: 6
Views: 481

GPIO / resistors - electronics beginner question

Hi everyone! I have a set up where a 5V pc fan is hooked up to my Pi which is powered by the 5V GPIO pin on it and has it ground going through an NPN transmitter. The base of the transmitter is connected to a 3.3V pin on the Pi and I put a 10K resistor between them. When I put the 3.3V pin into the ...
by YemSalat
Sun Jun 21, 2015 3:39 pm
Forum: Networking and servers
Topic: Apache Webserver
Replies: 6
Views: 856

Re: Apache Webserver

Just been looking at Bootstrap, do I need to download it to the Pi or can I download it to my Mac and configure the web page on that and transfer it across once done? Second option is usually the preferred approach. You'll still need to upload all the files, including Bootstrap to your Pi when you'...
by YemSalat
Sun Jun 21, 2015 3:36 pm
Forum: Advanced users
Topic: Linux kernel is now 4.0
Replies: 182
Views: 81456

Re: Linux kernel is now 4.0

Yay! :D
So far so good.. (*after ~7 minutes of usage)
by YemSalat
Sun Jun 21, 2015 1:34 pm
Forum: Networking and servers
Topic: Apache Webserver
Replies: 6
Views: 856

Re: Apache Webserver

Just a couple more words on security - I said previously that Apache is quite secure by default, but I meant that in regular website server use, where every one can access your server. If you want to use it only yourself - I suggest you look into Apache Digest Authentication and possibly also SSL - ...
by YemSalat
Sun Jun 21, 2015 1:26 pm
Forum: Networking and servers
Topic: Apache Webserver
Replies: 6
Views: 856

Re: Apache Webserver

Well, for the frontend of your web app - you'll need some html/js skills. I would suggest using Bootstrap (a css framework that helps with styling and page layout) and jQuery (javascript librabry to assign click events for buttons, etc.) For backend - I would just use whatever language you are curre...
by YemSalat
Sun Jun 21, 2015 12:31 pm
Forum: Beginners
Topic: Motor control board advice needed
Replies: 6
Views: 468

Re: Motor control board advice needed

Got it, thanks again! And thanks for the thread you linked - very helpful as well.
by YemSalat
Sun Jun 21, 2015 12:17 pm
Forum: Beginners
Topic: Motor control board advice needed
Replies: 6
Views: 468

Re: Motor control board advice needed

Great!

Do you think its OK to power two 3-6V dc motors with this board and the Pi from the same sourse (I have a 2A battery)?
by YemSalat
Sun Jun 21, 2015 12:00 pm
Forum: Networking and servers
Topic: Apache Webserver
Replies: 6
Views: 856

Re: Apache Webserver

1. By default you shouldn't need to restart it - it will work automatically. Easy to check - reboot your pi and try to access the web page again - it should work (although its gonna take some time to boot the Pi and start Apache) 2. You don't need port forwarding on local networks - all ports are se...
by YemSalat
Sun Jun 21, 2015 11:40 am
Forum: Beginners
Topic: Motor control board advice needed
Replies: 6
Views: 468

Re: Motor control board advice needed

Thanks for a quick response! Do you think this one will work? http://www.ebay.com.au/itm/Dual-H-Bridge-Stepper-Motor-Drive-Controller-Board-Module-For-Arduino-L298N-TG-/181687932010?pt=LH_DefaultDomain_15&hash=item2a4d71d46a http://i.ebayimg.com/00/s/MTAxMFgxMDEw/z/PQYAAOSweW5VAE3L/$_12.JPG Features...
by YemSalat
Sun Jun 21, 2015 11:27 am
Forum: Beginners
Topic: Motor control board advice needed
Replies: 6
Views: 468

Motor control board advice needed

Hi! I am slowly progressing with my project, and now I am at the point where I need to hook up a couple of wheels to my Pi. I've got a pair of these wheels which come with motors included: DC3-6V Gear Motor http://i.ebayimg.com/00/s/NDgwWDY0MA==/$T2eC16ZHJGwE9n)yUZlnBQGT5SVTUQ~~60_12.JPG http://www....
by YemSalat
Sun May 31, 2015 6:43 pm
Forum: Beginners
Topic: Best way to connet wires to GPIO on the Pi
Replies: 20
Views: 1236

Re: Best way to connet wires to GPIO on the Pi

OK, thanks again everybody!

I'll stick with dupont cables for now, but will look into other solutions in the future (depending on how I go with my experiments)
by YemSalat
Sun May 31, 2015 12:58 am
Forum: Beginners
Topic: Best way to connet wires to GPIO on the Pi
Replies: 20
Views: 1236

Re: Best way to connet wires to GPIO on the Pi

Thanks everybody! I ordered a couple of dupont wires packs for now: http://i.imgur.com/xxNI5zym.png You could try some of these fitted to the cable, and insulate them http://proto-pic.co.uk/female-crimp-pins-for-0-1-housings-100-pack/ These do look very interesting. But if you check out the video on...
by YemSalat
Sat May 30, 2015 3:27 pm
Forum: Beginners
Topic: Best way to connet wires to GPIO on the Pi
Replies: 20
Views: 1236

Re: Best way to connet wires to GPIO on the Pi

There is some 40 pins terminal block adapter. Google it and you will find some. http://www.ebay.com/itm/IDC40-40pin-Header-Breakout-Board-Terminal-Block-Connector-PLC-adapter-Interface-/271454544661 Thanks! But I'm urrently only looking into adding a fan, I think this is more than what I need at th...
by YemSalat
Sat May 30, 2015 2:26 pm
Forum: Beginners
Topic: Best way to connet wires to GPIO on the Pi
Replies: 20
Views: 1236

Re: Best way to connet wires to GPIO on the Pi

I dunno, I would like to minimize as much wear off as possible, plus I heard running on high temps can increase the risk of memory card corruption. When its around 50C - it feels quite hot to touch, and my case is made of cardboard, I know it will take a lot more to be a fire hazard, but I'd rather ...
by YemSalat
Sat May 30, 2015 2:18 pm
Forum: Beginners
Topic: Best way to connet wires to GPIO on the Pi
Replies: 20
Views: 1236

Re: Best way to connet wires to GPIO on the Pi

A fan or heatsink on a Pi usually is not needed. They don't get hot in normal use. Search the forum and you will find many posts saying a fan is an unnecessary waste of electricity. I'm using my Pi as a game server, its a bit overclocked as well, and currently runs ~45-47 (a few times went up to 50...

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