Raspberry Pi Forums

BMS Doug

I had to save the picture to my PC and open it with an image viewer.

BMS Doug

I think we need a full anechoic chamber :) Now where can I get a few thousand empty egg boxes from... :lol: About 25 years ago I went into the hemi-Anechoic chamber at NPL (Teddington) (my dad used to work there) * the absence of sound is very weird, takes some getting used to. *(no he didn't work ...

BMS Doug

I saw this video awhile ago, very interesting teardown of an older thermal imaging camera.

As opposed to his teardown of a more modern FLIR camera

BMS Doug

joan wrote:
BMS Doug wrote:*nods* if it still doesn't work then you haven't hit it hard enough yet.
It's bust. The only use now will be in testing I2C. I'll buy another if I can find one for a few pounds.

Cheapest one I can find is £12, I guess its a much better sensor than the HC-SR04

BMS Doug

Nice robot Ric, are you planning to move to remote control of it in the future?

BMS Doug

did you mean these ? http://ecx.images-amazon.com/images/I/41O5NPcV0qL._SX300_.jpg you would also need the female crimp pins to go with them and there would still be the problem that the pin arrangement on the Raspberry pi won't allow for many of these to plug in conveniently for you DHT11 (unless y...

BMS Doug

*nods* if it still doesn't work then you haven't hit it hard enough yet.

BMS Doug

Here is a more descriptive picture http://rich.homeunix.com/hobby/relay8-detail.jpg that's a nice little board, I especially like the RJ45 I2C bus idea. Also worth noting that the MCP 23017 second port connection could be used as digital inputs or outputs if desired (although a ground connection wo...

BMS Doug

Well I mounted my SRF02 but it appears to be bust. It'll flash the LED when I tell it to do a reading, it'll report its version, it'll do autoranging, it'll report the minimum usable distance in inches, centimetres, and inches, it'll let me reprogram its I2C address. It just always returns 0 for th...

BMS Doug

I really like the video of the leg waggling, good progress.

there's a lot of servo Jitter there, no luck clearing that up yet?

BMS Doug

Am I missing something here? :) Do joan's tests just show that if you point the sensor at 90 degrees to a wall, you get fairly accurate readings at 40cm range? And if not at 90 deg ,then results are drop off? Does 1+1 = 2? :) Simon that's definitely the case, Joan started investigating the issue af...

BMS Doug

I have just finished making a cocktail tabletop arcade cabinet (typical standard build done a 100 times over already) but the finished product has been built into an existing cocktail table so its purposefully massive and sat in the middle of my living room as intended. I have noticed that the larg...

BMS Doug

pluggy wrote:Last time I checked, none of my Pis had a ribbon cable......

optional extra, handy for projects.

I think I've spent about 5x the price of a Pi on optional extras.

BMS Doug

heh, I'm happy to spend money to buy one rather than start a twitter account.

but as My Pi is going to be in a bonded polycarbide armour case I won't be buying one yet.

BMS Doug

I think that you'd have more chance with a blimp, but it may need a daily hydrogen top up and you are at risk of it blowing away during high winds.

BMS Doug

your touchscreen uses up 2 spi bus positions, one for the display screen and one for the touch interface, try the following connections: screen pin 27 & 33 = MOSI = GPIO 19 screen pin 29 = MISO = GPIO 21 screen pin 25 & 35 = SCLK = GPIO 23 screen pin 23 = select = GPIO 24 screen pin 37 = select = GP...

BMS Doug

Any suggestions? My classic answer to messages like your: Google is your best friend. Check how you can control LED with RasPi. Laser is actually a LED with slightly higher current requirements. A circuit to drive LED via transistor is what you need... therefore, google for "Raspberry drive LED wit...

BMS Doug

joan wrote: Perhaps my lollipop stick wasn't calibrated properly!

I'll certainly be interested in a very controlled environment test, sadly I don't expect to have time for that for months, at the earliest.

BMS Doug

The 3v output simply attaches to a screen providing a weak field. Am I right in guessing you first want to apply +3V, then -3V, and you have four 1.5V cells with the earth in the middle? If this is being run indoors with other power available - so the apparatus itself is mainly powered from mains, ...

BMS Doug

more detail needed:

what size of screen are you looking for, clearly you want > 2".

I don't think the LCD screens will be too extravagant for your power budget, a lot of projects use them for portable Pi's and still get reasonable battery life.

BMS Doug

It's not something that I'd be interested in, I won't often want a portable powered USB hub and if I did I'd probably just combine it with this powerbank (which I already own). I guess the critical issue is price, how cheaply can you get a reliable hub + Case + powerbank and do all the wiring requir...

BMS Doug

Hi Joan, that's very interesting data, I was expecting to see the shortest response time at the 0 degree angle but that doesn't seem to be the case as your data is returning the lowest readings at -20 degrees, I would speculate that this could be due to the shape of the room you were testing in. I'm...

BMS Doug

his follow up video is very convincing. it convinced me that he has done it and it applies power to the power LED. I would never do this, I can't think of any reason why it wouldn't be easier and more convenient to get a micro USB adapter than a fitting that plugs into the Pi's headphone jack. Reaso...

BMS Doug

Hi all. Sorry, I promised earlier in the thread to let everyone have details of a version of espeak (the well-known text-to-speech engine) modified to create a Dalek effect. I did this some time ago but wanted to experiment with the config of espeak to see if I could add stress on each syllable, I ...

BMS Doug

Hi Hugh, But it boots, works for a bit, then decides to die Then the issue is obviously reduced down to RasPi... If I can speculate a bit, it could be that there is a junction problem and when the problematic component's temperature is increased, its pin gets disconnected. Boot the RasPi and gently...

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