That is their part number for bulk orders, the trick on Digikey is simple shorten the part number. If you drop the "-T" suffix it display individual unit part numbers. Look at Digikey partnumbers 620-1131-1-ND and 620-1299-1-NDby freds - Wanted
Do you have the USB serial cable? If so after you have uploaded the boot strap which it sounds like you have done, you do future programming via the serial cable. The boot strap takes the following steps: 1. Starts up and blinks the led in a pattern indicating ready to load new program. 2. Goes into a wait loop looking for new code coming in via the serial port. If it receives new code it loadsby freds - RepRap Host
Hi John You should only have to upload the bootstap firmware once which you have done using avrdude. Having the stk500v2 supported at a bootloader upload device in the arduino IDE for the stk500v2 is something you will have to research. But since you have the bootstrap on the chip already not something that is critical to using the normal sketches.by freds - RepRap Host
Lets see the link!by freds - Powder Printing and Selective Laser Sintering
Hey Prober Lets see some orginal research on you part, rather then leading comments? If so I will humbly give you credit, after you get more then four responses from people who have also contributed?by freds - Wanted
> > ----- > > > Why is this in the wanted section? > > > > > > Because I want you to visit my Blog and get to > > work developing the technology. > > > > > > Do you realize how bad that sounds? Why did you > knock on my door? So you can come over to my > house and bake us a cake.... I'll share! And after you design the cake deby freds - Wanted
You might design it to have a side slot that you insert a metal retaining washer in like on the cupcake extruder design or simply have a flange for the bolts that the retaining washer anchors to.by freds - Mechanics
Obvously if you are using the extruder controller PCB from makerbot then you should stick with the 168 for pinout compatibility. The extruder controller has a lot less multitasking to do so running it at 8 or 10mhz should be minimal impact. Again with a NonStandard clock rate you have to recompile the boot strap and the base Audino enviorment. Also if using the internal clock the fuzes that yby freds - Controllers
Some of the firmware is based on interrupt driven routines for the stepper motor and they use the code path length for timming on driving the step pulse. Though a slower processor might mean a longer step pulse. Sound like you are putting together your own electronics. The atmega644p is a dual serial port version of the chip and might not be readly avaialble. It is used with the idea of using thby freds - Controllers
JohnWasser Wrote: ------------------------------------------------------- > > You need a DIFFERENT device to program the Arduino > bootloader into a bare ATMega chip to make it into > an Arduino. Usually you purchase and Arduino with > the bootloader already programmed. The device you pointed to is a iscp programmer. Bare AVR chips from the manufacture need to be programmed withby freds - Controllers
The bootloader is a program that is first in control when you reset the processor or it gets reset automatically by the RTS signal that is one of the signal lines from the TTL cable (depends on a jumper on the board). It has first dibs on the serial port to receive a new program to load into the flash memory of the chip. There is a time window in which if it starts to receive a new program viaby freds - Controllers
Well it fairly much a matter of matching components. The McWire was designed for milling and being build with local home hardware store components here in the USA hence imperial stuff. The basic idea of a repstrap is to use it as bootstrap until you can create your first darwin or mendal. Look for inexpensive PCB milling for you insperation.by freds - General
Well you do have to have some way to get the bootstrap loader onto the chip and that is done with jtag or icsp. You could have temporary programming socket that programs the chip before it is loaded into the board. I previously blogged about how to do that with a USB-TTL (5v) cable.by freds - Controllers
Well it depends if you want an off chip oscillator. The basic 644 is lot more available then the 644P with two serial ports. I would think 8mhz rather then 16mhz would be adequate for slave controllers. If you use on chip oscillator you just have to fairly much provide a ground and VCC. The tool chain for using with the chip would be a bit different at the binary level to use the Aurdino develby freds - Controllers
The analog pins are in a different catagory so the zero doesn't refer to the physical pin number.by freds - RepRap Host
Hi James If you avoid the VB specific libraries and use .net functions only it’s possible to translate to C# at which point it could be used under Mono for Mac and Linux.by freds - RepRap Host
Hi Nik Ok thats good to note. Let me put some keywords in here so the search engines can find this post. AVDUDE, BITBANGER, AVR BOOTSTRAP ISP, Adafuit miniusb Ardunio USB bootstrap load.by freds - Controllers
Hi Volty I spent a couple of hours on this (sucked me into the vortext) and it appears that you have to have a new core compile for the different processors under Arduino IDE. It appears that Zach when he designed the Sanguino used RobotCraft's code for the 644 processor as a base when transitioning to the 644P. RobotCraft's code for their "Arduino IDE ATMega 48/324/32/644 Patch" can be downby freds - Controllers
toomanyplugs Wrote: ------------------------------------------------------- > Arduino "miniusb" USB to TTL converter, v3 from > adafruit, tried to run it in bitbang mode based on > this ExMrClean post, with the correct pinouts from > the arduino page and the FTDI datasheet, including > setting the CTS# and RTS# pins in avrdude.conf as > negative pins (ie, SCK ~3). Inconclusive:by freds - Controllers
For removing the chip there is a special Desoldering solder "Chip Quick". Another approach is simply use a dremel tool (very, very carefully) to cut the leads off of the current chip and then remove the left behind pins with flux and solder wick before soldering on the new chip. For home made hot air rework tools check the following links: Note the second link talks up front about remby freds - Controllers
Since you previously had stepper motors working take a look at the values for end & home sensors and stepper motor enable from your previous driver. There can be various differences if they are active low or high depending on your hardware mix.by freds - RepRap Host
It looks like Stephen does his development under Linux. A PC app that understand the gz/tar format is PowerArchiver. I transferred the contents to zip file for you as an attachment.by freds - RepRap Host
Hi Everyone I stumbled across this post that I found interesting.by freds - Controllers
Hi Jeff I am a little puzzled as to why you were able to load the bootloader three times and then after that unable to make it work. Did you execute the same fuze commands on each load? For removing the chip there is a special Desoldering solder "Chip Quick". Another approach is simply use a dremel tool (very, very carefully) to cut the leads off of the chip and then remove the left behindby freds - Controllers
Hi Jeff You are into an area of detail that I am not familure with as I got my commands to execute from another post. One From your current post it does looks like it not talking via the SPI interface so one possiblity is that you have simply disabled the SPI programming interface and that the bootstrap is still there. What kind of behaviour are you getting on the LED on a reset? Some possibby freds - Controllers
You should not have had to load the boot strap mulitple times. Also the bootstrap code needs to be compiled for your processor, so it looks like you uploaded the wrong bootstrap code. The fuzes also vary between the processors, so you need to find a AVRdude example for your chip to get the correct fuze settings. Not something that I had to do since I was targeting the ATmega644P chip that is usby freds - Controllers
I wonder if the bearing are offset from each other (so the bolt heads do not collide) if you could switch back to using normal skate bearings when are generally available every where?by freds - Mechanics
I made my adapter cable by running an old PC IDE hard disk cable though a band saw which took care of the PCB board side. (I have bunchs of them laying around since each hard drive I brought over the years cames with a spare.) For the mating connector to the USB TTL adapter I took individual pins for a DB-25 male connector and after inserting them into the USB TTL plug I then hot glued the wholeby freds - Controllers
Your right, though there is local movement at the UW to come up with a public domain mix to do ceramics. I wonder if there would be enough physical strength to take it down to the art department and fire it to support a Mendel?by freds - Reprappers
Hi I have seen Makerbot be hit or miss on shipping with the boot straploader loaded onto the chip. Since they are a startup company it's totally understandable. The other thing is it's kind of a timming problem to get the boot strap loader to work correctly. My laptop used to be real reliable now it is extreamly hit or miss, I have to watch the disk activity light and when it starts to slow dowby freds - Controllers