A selection of the Allegro micro parts there are L6208's and L6228's If you hunt around they can be had for cheap, but on the big players they can be quite pricey.by annodomini2 - Controllers
1. Its not AC supply, DC only. 2. Another problem with that would be the need for extension cables and splitters for the power leads. 3. While its quiet and compact, its exposed and pricey. You would have to buy a regular tranformer on top of the $50 for this distribution block. As has been said only 12v is used, so its only 12v distribution, the board is effectively a filter for the 12v suppby annodomini2 - Reprappers
Cable or as our US cousins like, zip ties.by annodomini2 - General Mendel Topics
mccoyn Wrote: ------------------------------------------------------- > I just ordered 10 PCBs that were 100mm x 100mm > from Seeed Studio for $40 + $5 shipping. They > also have an interesting distribution system > targeted at helping open source hardware projects > get PCBs. I ordered these boards last week and > they shipped out of Hong Kong two days ago. > > > Sby annodomini2 - Controllers
TC Wrote: ------------------------------------------------------- > My gut on developing new electronics is to take a > three step approach: > > 1) map the existing solution onto an ARM Cortex M3 > microcontroller such as NXP's LCP176x family > > 2) design and have manufactured an integrated > single board RepRap controller > > 3) develop a extensible/expandable sby annodomini2 - Controllers
aka47 Wrote: ------------------------------------------------------- > I must admit to being impressed by the LPC2468 the 24xx series is ARM7-TDMI not Cortex M3, the main benefit of the Cortex M series is the introduction of the NVIC or Nested Vectored Interrupt Controller. This makes it better suited to Real-time control systems.by annodomini2 - Controllers
Mount them with tensioned wire thenby annodomini2 - General Mendel Topics
The best heatsink material is diamond, but with obvious cost issues. Was considering a grid of IR LEDs to heat the bed, but I doubt you'll get the power output or efficiency.by annodomini2 - General
mccoyn Wrote: ------------------------------------------------------- > I'll note that my biggest disappointment with the > board I designed is that it contains over 100 > components that need to be soldered. I'd like to > find components that integrate multiple pieces > into one package. Look at the stepper drivers, > for example. The v1.2 board has 8 diodes on it, > butby annodomini2 - Controllers
sheep Wrote: ------------------------------------------------------- > I think there is a lot of underestimating the > software costs. This is usually described in > units-per-free-time-interval. Or in Tecklish > UPFTI. Many call this wasting time. > > Some of the ATMEL workshops I attended did AVR in > the morning and ARM in the afternoon. Arm is > much more a compleby annodomini2 - Controllers
rocket_scientist Wrote: ------------------------------------------------------- > TC Wrote: > -------------------------------------------------- > ----- > > Should we develop an integrated solution or an > > extensible solution? > I see three major forks here. 1) Reprap-on-a-Board > that mccoyn is doing, 2) the current fixed number > of mostly dumb modular units plugby annodomini2 - Controllers
aka47 Wrote: ------------------------------------------------------- > Given the results that nophead et al have been > getting with heated build platforms and reducing > warping. I can't see how any future deisgn could > not have at least. > > 2 heater controls (Drive and Sense) > 1 Fan Control > > The Heater controls are extruder and heated bed, > fan is selectivby annodomini2 - Controllers
After thought, do we want to provide some form of heated bed control?by annodomini2 - Controllers
TC Wrote: ------------------------------------------------------- > Anodomini2... > > RE: item 5 - what do you mean by "EMC"? > > Electro-Magnetic Compatibility is what comes to > mind for me (an EE), but I don't think that is > what you meant. > > Building an extensible/expandable system will > complicate and slow down development > significantly. Note that Iby annodomini2 - Controllers
Its all a matter of perspective, as a professional software engineer I find the Arduino environment limited, I dislike the layout and configuration. However this is due to the fact that I am familiar with other IDE's and their capabilities. I am not against Arduino, the simplicity of the interface is ideal for new users and those wishing to understand at least something about embedded programmiby annodomini2 - Controllers
The torque required is determined by the mass and static/rolling friction of the system. Might want to try starting and stopping your machine at different points, could be that certain elements of the machine are not square and as a result the machine is effectively jamming.by annodomini2 - Controllers
aka47 Wrote: ------------------------------------------------------- > On PWM > > Don't get hung up on a lack of dedicated hardware > PWM it is trivial to do in software particularly > for the requiremnt/s of driving a heated bed and > an extruder heater. > > The thermal response of both of these items means > arelatively low PWM frequency is plenty good > enough.by annodomini2 - Controllers
Might be best to setup a group and take it off this thread and/or forum. There are a number of practicality, cost and technical issues that would need to be covered. As the old saying goes, 'there's many ways to skin a cat'by annodomini2 - Controllers
I've nothing against the LPC1343, I have an LPCxpresso version, but the lack of PWM makes it less suitable for a complete system.by annodomini2 - Controllers
I'm in TC, i'm an Embedded Software engineer so we have two bases covered. Shall we setup a working group?by annodomini2 - Controllers
There have been some tests with using wire wound resistors as the heater element, but most that I have observed used a machined aluminium block to transfer the heat from the resistor to the barrel. How about using a simple ring crimp, such as Ring crimp Thanks for readingby annodomini2 - Plastic Extruder Working Group
mccoyn Wrote: ------------------------------------------------------- > I've found that the opto-sensors in use for the > Mendel can see through blank paper, but can't see > through paper I have printed black with an inkjet > printed. This makes it easy to make custom > encoders. For linear encoding you could theoretically use of the online barcode generators.by annodomini2 - General
casainho Wrote: ------------------------------------------------------- > annodomini2 Wrote: > > That LPCxpresso seems to be expensive and with > some problems with Free Software tools. > £20 for a dev board with Full JTAG and dev tools is ridiculously cheap > > Yes :-( -- but OpenOCD have already some dev code > for SWD, no? I think soon it may work with SWD, > whaby annodomini2 - Controllers
TC Wrote: ------------------------------------------------------- > Indeed. Some of the development boards have > started to integrate USB to JTAG intefaces. From > what I have seen these are all based on the FTDI > FT2232 chip. > > > > This approach eliminates the need for an external > JTAG probe for debugging. > > If you are doing "bare metal ARM developmenby annodomini2 - Controllers
Adrian, are you planning on doing any more soon?by annodomini2 - For Sale
You forgot to include that the LPCxpresso comes complete with a JTAG. For £20 I bought one!by annodomini2 - Controllers
Bent Valerius Wrote: ------------------------------------------------------- > I think that a pneumatic stepper motor would be > far more printable. The problem then is making the control valves, that will seal adequately.by annodomini2 - Mechanics