Raspberry Pi Forums

cruster

Hi, Raspberry pi B+, latest Raspbian installed from Noobs. Updated with apt-get. Wireless network card = micro USB Realtek RTL8188CUS 802.11n WLAN adaptor. Power supply is stock Pi supply (?) (white with Pi logo) - Stontronics rated 2A @ 5V. I'm using PuTTY to SSH into the Pi, all works fine for a w...

cruster

Most of the stuff I've posted about high rates of SPI sampling acknowledge the pointlessness of sampling faster than the data can be processed. In OPs project he may be able to acquire the samples, do the maths on them, move the camera accordingly and then acquire (next set of) samples etc., etc., ...

cruster

kumkum488 wrote:thanks. i visited the first and third youtube links. those seems a good place to start

Eli the computer guy is also very good but he's a bit more "wordy" than the others - but just as helpful.

cruster

This looks to be very interesting!
http://www.raspberrypi.org/forums/viewt ... 41#p514141

cruster

Youtube!

I find these particularly helpful

https://www.youtube.com/channel/UCvA_wg ... XI8Rbg_WiQ
https://www.youtube.com/user/elithecomputerguy
https://www.youtube.com/user/danscourses

(edit I'm also starting off with Linux)

cruster

http://www.youtube.com/watch?v=s_4bDlW3nak Ok, that's pretty impressive stuff given they are in a room with all the attendant echos that environment is going to produce... I'm betting that's not implementable with a PI (but please prove me wrong !) The details are in an IEEE article for which you h...

cruster

I'm just guessing now... but if you wanted to find the direction of something suddenly very loud and sporadic (like a gunshot) then you could do that particular part in hardware - two microphones - to two threshold detectors - each of which output a logic 1 to a processor. The time difference betwe...

cruster

http://www.youtube.com/watch?v=s_4bDlW3nak Ok, that's pretty impressive stuff given they are in a room with all the attendant echos that environment is going to produce... I'm betting that's not implementable with a PI (but please prove me wrong !) The details are in an IEEE article for which you ha...

cruster

I'm just guessing now... but if you wanted to find the direction of something suddenly very loud and sporadic (like a gunshot) then you could do that particular part in hardware - two microphones - to two threshold detectors - each of which output a logic 1 to a processor. The time difference betwee...

cruster

Im trying to find the direction of arrival of sound by using the GCC - Phase transform and steer a camera mounted on a bracket controlled by two servo motors based on the obtaind direction. Sorry, I've no idea what the 'GCC - Phase transform' program/project is ? Can you post a link to what you mea...

cruster

I'm aware of Nyquist criterion, the maximum frequency is about 4 kHz so 8kHz should be adequate. I don't know if RPI will tolerate more than 8kHz. Nope! 8Khz is the minimum sampling frequency in theory for a 4khz waveform so that aliasing does not occur. mikronauts is quite right in saying that in ...

cruster

My feeling is you should look at something with a bit more "grunt" as you say you need in real time, to acquire data from 6 A/Ds and then run FFT algorithms of some description on that data... ? If that's so, then I'd point you towards dev kits such as these - http://www.ti.com/tool/ek-tm4c123gxl or...

cruster

Thanks

cruster

Many thanks for your detailed reply. I did say I was a complete Linux beginner :) I looked up editing fstab and found this: http://pclosmag.com/html/Issues/200709/page07.html I've now corrected my fstab entry to read: /dev/sda1 /home/pi/flash vfat defaults 0 0 This now mounts my flash drive into my ...

cruster

matar770 wrote:
cruster wrote:Personally (imho) if it were me, I'd be looking at other solutions.
other solutions like what?

http://www.microchip.com/ParamChartSear ... nchID=1005

cruster

Having done a lot of embedded stuff with microchip pics, I think you will struggle getting the pi to do all of what you describe unless you're prepared to write the code in C or even assembler. That the pi doesn't have any analogue i.o is going to be a problem for you in terms of overhead. Personall...

cruster

Ok I did it. :D (sorry Trev, I just couldn't get your method to work) Here's what I did. 1). My flash card appears as "sda1" in folder /dev 2). pull up /etc/fstab in an editor (I used sudo nano /etc/fstab) 3). I added this line to fstab: /dev/sda1 / vfat defaults 0 3 (I chose 3 as the other devices ...

cruster

Thanks Trev, That all very looks promising. I shall read and digest! I've been finding youtube a valuable resource for things Linux, in particular (as a total newbie to Linux) I found these chaps tutorials particularly helpful and understandable: https://www.youtube.com/channel/UCvA_wgsX6eFAOXI8Rbg_...

cruster

Hi all, OS is Raspbian. Pi B+ I've just started learning Linux and I'd like to mount a USB flash drive using the command line interface. Can any helpful person point me towards a suitable tutorial or at least explain the commands and the process that I will need to use? I've looked in /dev (ls /dev)...

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