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by keithellis
Tue Jan 28, 2014 10:39 am
Forum: Advanced users
Topic: How force Ad-Hoc network in N mode ? Or use N mode otherway.
Replies: 8
Views: 9296

Re: How force Ad-Hoc network in N mode ? Or use N mode other

Not 100% sure, but I suspect this could be a limitation of the wifi dongle. It is designed to receive 802.11n signals, but it may not have the hardware to create an 802.11n network. I think most 'n' wifi points have multiple antennas to allow them to get the throughput. Perhaps someone else could co...
by keithellis
Tue Jan 28, 2014 8:24 am
Forum: Networking and servers
Topic: Non-cable Remote Access
Replies: 5
Views: 985

Re: Non-cable Remote Access

So are you saying that I set up my RPi as an access point that my laptop can connect to like a printer? And if so, how would I do that with a dongle exactly? This is one way of doing it. Do you have a local wireless network which your laptop is connected? If so you just need to connect you RPi to y...
by keithellis
Mon Jan 27, 2014 4:17 pm
Forum: General discussion
Topic: Proxy settings - access net in terminal
Replies: 8
Views: 3763

Re: Proxy settings - access net in terminal

Can you ping 8.8.8.8 from one of the schools computers. It is most likely the proxy is preventing certain connections, that is what they do. Try using the guest network, that should be unrestricted.

Or talk to your admin to open up the sites you need access to on the proxy.
by keithellis
Mon Jan 27, 2014 3:57 pm
Forum: Networking and servers
Topic: GUI onto laptop via WiFi?
Replies: 7
Views: 3231

Re: GUI onto laptop via WiFi?

Another way and possibly easier to setup would be to setup an Adhoc wifi network on your laptop and then setup the Pi to connect to the Adhoc network. Just be aware that unless you have you laptop plugged into an ethernet connection you laptop and Pi will not have access to the internet whilst doing...
by keithellis
Mon Jan 27, 2014 3:51 pm
Forum: Networking and servers
Topic: Solution for offline wifi setup
Replies: 10
Views: 4144

Re: Solution for offline wifi setup

Hello, I realise this is a very old post, did you figure out a solution? I have just setup a model A headless using a USB console cable. In this way I can gain access to the CLI and edit the /etc/network/interfaces and /etc/wpa_supplicant/wpa_supplicant.conf files to setup the wireless network thus ...
by keithellis
Wed Jan 22, 2014 10:07 am
Forum: Automation, sensing and robotics
Topic: Motors with the l298N
Replies: 19
Views: 5850

Re: Motors with the l298N

Correct you could leave the jumper over the enable pins (the jumper ties the pin high, enabled) and just use IN1/IN2 to control the motor. So lucky me, I found a chip I had at home already, the l293D. I have it wired up as the picture shows, and I would just like some confirmation that everything i...
by keithellis
Tue Jan 21, 2014 6:30 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi Line Follower randomly stops working
Replies: 10
Views: 4304

Re: Raspberry Pi Line Follower randomly stops working

Another thought, might cause an issue. You don't always do a.stop() before you do a.start(60) i.e in your "straight" command you do p.start(60) and then in your "left" command you do p.start(100) It might be causing a problem by starting PWM twice, or many multiple times. I would...
by keithellis
Tue Jan 21, 2014 5:54 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi Line Follower randomly stops working
Replies: 10
Views: 4304

Re: Raspberry Pi Line Follower randomly stops working

Have you got this working yet. With my limited knowledge I would have controlled the motors slightly differently . You have setup PWM so to change the speed of the motor you can use a.ChangeDutyCycle(dc) where a is your variable for a, b, q or p and dc is the duty cycle, 0 for off up to 100 for full...
by keithellis
Tue Jan 21, 2014 4:22 pm
Forum: Beginners
Topic: GPIO pin value not staying set
Replies: 10
Views: 2774

Re: GPIO pin value not staying set

texy wrote:Just to add that the Pi has internal pull-ups and pull-downs that can be used - IF they are enabled.
So you don't need to physically fit an external resistor (or worry about the value of it).
Texy
Interesting, how do you enable the internal pull-up/pull-downs?
by keithellis
Tue Jan 21, 2014 4:13 pm
Forum: Automation, sensing and robotics
Topic: Using WI-FI for 'Robots' - home vs. away
Replies: 4
Views: 1361

Re: Using WI-FI for 'Robots' - home vs. away

You are correct, you will not have an internet connection but any wifi device will be able to connect to it to control it. Not strictly true - when setting up the WAP, you can set up encryption such that only clients that know the password can get in. That'll keep you safe from A.N.Other taking con...
by keithellis
Tue Jan 21, 2014 12:40 pm
Forum: Automation, sensing and robotics
Topic: Using WI-FI for 'Robots' - home vs. away
Replies: 4
Views: 1361

Re: Using WI-FI for 'Robots' - home vs. away

Ok, I'm new to this too, but may be able to set you off in the right direction. I think the best option is to setup your Pi as a wifi hotspot. You are correct, you will not have an internet connection but any wifi device will be able to connect to it to control it. If you need to connect it to the i...
by keithellis
Tue Jan 21, 2014 10:51 am
Forum: Automation, sensing and robotics
Topic: Jumping in head first
Replies: 11
Views: 2231

Re: Jumping in head first

Sounds like a good project, I’ve not much experience in quad copters, but I would question the use of a RPi model B. In the air you will not need ethernet or USB, so surely a model A would be a better option. They are lighter and use less energy, something which will be critical for you. You could a...
by keithellis
Tue Jan 21, 2014 8:19 am
Forum: General discussion
Topic: Swagstore 8GB NOOBS doesn't have Wolfram?
Replies: 8
Views: 1224

Re: Swagstore 8GB NOOBS doesn't have Wolfram?

Well I'm more confused now Just ran update/upgrade rpi-update and still no sign of Wolfram ?? :confused: its on my other main working Raspbian card has it been pulled? Simon Did you run the upgrade before the update? You need to update the repository index first and then run the upgrade. Try sudo a...
by keithellis
Tue Jan 21, 2014 8:06 am
Forum: Automation, sensing and robotics
Topic: L293D & SN754410 question
Replies: 4
Views: 3153

Re: L293D & SN754410 question

Ravenous, thanks for your reply. In response to your comments. 1) So with regard to the Enable pins, if I positively set them low, rather than unconnected the outputs should not go high. 2) I suspected this was the case but wanted it confirming. 3) With regard to putting the PWM onto the enable pins...
by keithellis
Sun Jan 19, 2014 9:05 am
Forum: Beginners
Topic: Are SD cards swappable between Model B and Model A boards
Replies: 3
Views: 634

Re: Are SD cards swappable between Model B and Model A board

Thanks for your help, this confirms my thoughts. I was wondering if the initial setup built the distro slightly differently between the two boards. Apparently not.

Cheers guys.
by keithellis
Sat Jan 18, 2014 10:51 pm
Forum: Automation, sensing and robotics
Topic: L293D & SN754410 question
Replies: 4
Views: 3153

L293D & SN754410 question

I've got a Raspberry Pi project ongoing, (http://www.keithellis.eu), I'm driving two motors through either a SN754410 or L293D motor drivers. They are both pin equivalent but the SN754410 does not have internal diodes across the outputs. I have a few questions, both drivers appear to operate the sam...
by keithellis
Sat Jan 18, 2014 10:21 pm
Forum: Beginners
Topic: Are SD cards swappable between Model B and Model A boards
Replies: 3
Views: 634

Are SD cards swappable between Model B and Model A boards

Hello, I've been working on a Raspberry Pi car project http://www.keithellis.eu and in doing some testing I have fried my Raspberry Pi. It was a model B running Raspbian. I think I will replace it with a model A, since I do not need the two USB ports or the RJ45 connector, it will also run for longe...

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