Please fill this in if you feel like it:
[url]http://goo.gl/forms/EqLcglx0Mi[/url]
You can probably guess what my current project is.
[QUOTE=scratch (nl);46336941]can't you just like half the RGB values for the bright LED's when using the neopixel library?[/QUOTE]
I can but you lose the range like that. A diffuser will give me more to work with in the long run, especially if I redo the animations or something
Hey
So I'm trying to reach a high baud rate with my STM32F411RE virtual com (Serial UART), however I start getting loads of errors at 460800baud. I would love to reach 921600 - what would be required to reach that? What is bottlenecking me currently?
Im using ST-Link for the communicating.
Or some way to pause displaying content on my terminal, and then display all the data when I tell it to start again - that could also be a solution.
EDIT:
Nvm, I didn't realise that the cursor could simply be moved - this removes the reason to go for higher baud rates :)
Dave's had a rant about FTDI now:
[media]http://www.youtube.com/watch?v=eU66as4Bbds[/media]
In that video dave say's the engineer makes the BOM and sends it to production.... a good engineer should do quality control on his product, certificate of conformity is a great.
And I kinda see where FTDI is coming from but it was quite an extreme measure to say the least.
[QUOTE=Subby;46350381]In that video dave say's the engineer makes the BOM and sends it to production.... a good engineer should do quality control on his product, certificate of conformity is a great.
And I kinda see where FTDI is coming from but it was quite an extreme measure to say the least.[/QUOTE]
FTDI chips are stupidly overpriced, they should really be dropped down to around the 50p - £1 mark.
And if its true what Dave said and its really that hard to get hold of the chips as they are always sold out... sounds like they need to ramp up production too. A product should never -ever- be sold out if people are willing to buy it.
Really there is no reason to use the FTDI USB-UART chips, there are plenty of alternatives such as Silicon Labs CP2102, Cypress Semiconductor CY7C65213 and Microchip MCP2200 that perform just as well and cost a lot less.
[QUOTE=Subby;46350381]In that video dave say's the engineer makes the BOM and sends it to production.... a good engineer should do quality control on his product, certificate of conformity is a great.
And I kinda see where FTDI is coming from but it was quite an extreme measure to say the least.[/QUOTE]
Typically some engineers request for samples to make a prototype to do quality control on, and even if some manufactures offer samples, sometimes there is too long of a lead time on them.
So I've built a prototype for my battery powered ATtiny84 temperature probes, but for the life of me I can't get the NRF24L01+ module transmitting.
A blink sketch works if I stick an led in each of the headers, but other than that it does nothing.
I'll post the sourve and circuit diagram when I get home, but for now just imagine its a ATtiny84 in parallel with a NRF24L01+ (0.1nF cap and 220 ohm resistor on the power supply) and a DHT22 running off two AA batteries.
I'm curious how small I can scale down a [url=http://www.labguysworld.com/Goldmark1_001.htm]field sequential color adapter[/url] for monochrome CRT's. You think It could be reduced for a 1" screen?
[t]http://www.labguysworld.com/Goldmark1_Final_001.jpg[/t]
Does anyone here have left over stepper motors / drivers I can buy ? I am currently looking at 3 of each of these two :
[url]https://www.iprototype.nl/products/robotics/servo-motors/stepper-motor-4.8kg-cm[/url]
[url]https://www.iprototype.nl/products/robotics/drivers-controllers/drv8825-steppermotor-driver[/url]
That totals me at around 90 euro's with free shipping. I looked online at websites like aliexpress or dx but couldn't find a cheaper alternative. Trying to build a small cnc machine btw.
Heh Rigol are having problems filling the huge number of orders for the DS1054Z.
Gotta wait till December for mine :-(
[QUOTE=Chryseus;46359147]Heh Rigol are having problems filling the huge number of orders for the DS1054Z.
Gotta wait till December for mine :-([/QUOTE]
Oh damn~ i guess people decided to order early for their christmas scope.
[QUOTE=quincy18;46358437]Does anyone here have left over stepper motors / drivers I can buy ? I am currently looking at 3 of each of these two :
[url]https://www.iprototype.nl/products/robotics/servo-motors/stepper-motor-4.8kg-cm[/url]
[url]https://www.iprototype.nl/products/robotics/drivers-controllers/drv8825-steppermotor-driver[/url]
That totals me at around 90 euro's with free shipping. I looked online at websites like aliexpress or dx but couldn't find a cheaper alternative. Trying to build a small cnc machine btw.[/QUOTE]
[url]http://replikeo.com/[/url]
$80 with shipping. Its from China, so you might end up waiting from 10-20 days. But if 30 EUR is worth waiting 10-20 days then go for it. Also, if you are planning to build a cnc then you might as well want to get the RAMPS board.
[t]http://u.limonene.net/Probe/sensor.png[/t]
And the code is [url=http://u.limonene.net/Probe/ATTiny84_NRF24L01.rar]here[/url].
The ATtiny doesn't have dedicated SPI pins so there is a library that turns the USI pins into SPI mode, DO->MOSI, DI->MISO, USCK->SCK.
Found a little handy tool that lets you calculate transmission line parameters from a 2D bitmap image.
[url]http://www.hdtvprimer.com/KQ6QV/atlc2.html[/url]
[QUOTE=Cakebatyr;46361406]
And the code is [url=http://u.limonene.net/Probe/ATTiny84_NRF24L01.rar]here[/url].
The ATtiny doesn't have dedicated SPI pins so there is a library that turns the USI pins into SPI mode, DO->MOSI, DI->MISO, USCK->SCK.[/QUOTE]
Stick a scope on it and see if the output is correct.
If only I had a scope...
[Editline]b[/editline]
[url]http://www.sphere.bc.ca/[/url] is the sketchiest website ever.
[QUOTE=alexaz;46360248][url]http://replikeo.com/[/url]
$80 with shipping. Its from China, so you might end up waiting from 10-20 days. But if 30 EUR is worth waiting 10-20 days then go for it. Also, if you are planning to build a cnc then you might as well want to get the RAMPS board.[/QUOTE]
Nice ! So the ramps board basically has 5 stepper motor drivers, fan controls and the posibility for me to add a extruder for 3d printing ?
How do you guys think about one of [URL="http://seeedstudio.com/wiki/DSO_Nano_v3"]these[/URL] "pocket" oscilloscopes? Obviously they're way less accurate than the real deal, but their size is kinda nice and the fact that they only cost like 100 bucks is very interesting for me.
[t]http://www.iprototype.nl/images/products/1424_original.png[/t]
[QUOTE=scratch (nl);46366806]How do you guys think about one of [URL="http://seeedstudio.com/wiki/DSO_Nano_v3"]these[/URL] "pocket" oscilloscopes? Obviously they're way less accurate than the real deal, but their size is kinda nice and the fact that they only cost like 100 bucks is very interesting for me.
[t]http://www.iprototype.nl/images/products/1424_original.png[/t][/QUOTE]
Go on ebay and buy an analog oscilloscope instead, those pocket oscilliscopes are absolutely worthless. About as useless as hooking the signal up to the line-in on your sound card. Heck, if you buy an analog scope you'll probably end up paying less.
Since you live in the Netherlands I might even be able to get you one if you really want an oscilloscope.
The only real valid usecase for these might be if you do something in the field, but even then there's better solutions...
[editline]30th October 2014[/editline]
But I think at that pricepoint you could get some USB oscilloscopes which would be heaps better.
I'd rather carry a backpack with a massive battery etc., and a digital oscilloscope, than one of those things.
If it was good, then maybe we'd have another story.
thanks for the info; I didn't know they were so fucking terrible :v:
[QUOTE=Cakebatyr;46364549]If only I had a scope...
[Editline]b[/editline]
[url]http://www.sphere.bc.ca/[/url] is the sketchiest website ever.[/QUOTE]
They're still amazing. Might I remind you of the mountain of free shit I got off them?
[QUOTE=pentium;46372667]They're still amazing. Might I remind you of the mountain of free shit I got off them?[/QUOTE]
Send me one of your oscilloscopes from your mountain.
[editline]30th October 2014[/editline]
[B]The ATtiny84 library had pins PA4 and PA6 reversed.[/B]
I only have two scopes. Neither are all that amazing to brag about once you go over 10mhz. The only scopes they had free were snapped up before I got there Aug 1.
Just contact Sphere. They got great deals on tek scopes.
[QUOTE=Cakebatyr;46372869]Send me one of your oscilloscopes from your mountain.
[editline]30th October 2014[/editline]
[B]The ATtiny84 library had pins PA4 and PA6 reversed.[/B][/QUOTE]
Only trust a library you've bodged up yourself.
Oke so I looked a bit more into cnc and figured I need at least 5 motors for the design I want to roll ([URL="https://www.google.nl/search?q=cnc+table&tbm=isch&tbo=u&source=univ&sa=X&ei=g1hTVMGOJcLhaK2LgeAK&ved=0CCIQsAQ&biw=1745&bih=868"]cnc table[/URL])
The RAMPS board looks perfect but the website is quite expensive for the arduino mega clone / stepper motor drivers. I was thinking of buying the following :
DX :
[thumb]https://dl.dropboxusercontent.com/u/28926055/order2.png[/thumb]
Replikeo :
[thumb]https://dl.dropboxusercontent.com/u/28926055/order1.png[/thumb]
And getting the aluminium / frame from a local hardware store. Does this look good ?
look for used nema17 stepper motors on ebay, same quality, but way cheaper.
the price for the arduino, ramps and A4988 is pretty cheap, im suprised. i think im going to buy it too
At the end, the most expensive part will be the frame, linear rails, acme thread spindle & nut and bearings (not the linear bearings). It must be rigid enough for engraving & milling. Wood or 30x30 Aluminum system profiles wouldnt do the job, i think. prebuilt aluminum frames (that are rigid enough to engrave hardwood) with A4 size will be sold for ~400$ and more on ebay.
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