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Re: Hacking the HP45

Posted: Fri Oct 18, 2019 1:15 pm
by inkjet

Re: Hacking the HP45

Posted: Fri Oct 18, 2019 1:33 pm
by inkjet
There are several ways to build the printhead with speeds, with the same qualities whether Altera, Xilinx, Arm, Atmega and Pic all work perfectly.

Re: Hacking the HP45

Posted: Sun Oct 20, 2019 8:06 am
by Priyashree
dragonator wrote:
Mon Oct 07, 2019 5:00 pm
I cannot judge whether the pins are connected correctly, but overall it seems like the right thing. I would lower the delay between clock 1 and clear 0 to 2 microseconds, but other than that, it seems fine.

Do wipe the head before printing. It will literally not work without it. Other than that, I cannot see why it would not work.
@Dragonator Excellent suggestion of wiping the head. My HP45 cartirage is a modified one ,it's a solvent based ink not water based. So it was hard to judge what happened while firing the signals.

Tried to put delayMicroseconds(2) for Primitive Clock and delayMicroseconds(1) for Primitive Clear. Will share the video of it.

Re: Hacking the HP45

Posted: Sun Oct 20, 2019 4:07 pm
by dragonator
MAsic12345 wrote:
Wed Oct 16, 2019 5:33 pm
dragonator wrote:
Mon Oct 07, 2019 5:00 pm
what is the speed of spitting HP 45
how fast can they fire?
what speed did are you achieve
I manage 50mm/s at 600 DPI. This gives 1200 firings per nozzle per second.

Re: Hacking the HP45

Posted: Tue Oct 22, 2019 3:02 pm
by MAsic12345
dragonator wrote:
Sun Oct 20, 2019 4:07 pm
MAsic12345 wrote:
Wed Oct 16, 2019 5:33 pm
dragonator wrote:
Mon Oct 07, 2019 5:00 pm
I manage 50mm/s at 600 DPI. This gives 1200 firings per nozzle per second.
How many amperes consumes HP 45?

Re: Hacking the HP45

Posted: Tue Oct 22, 2019 10:04 pm
by inkjet

Re: Hacking the HP45

Posted: Wed Oct 23, 2019 4:09 pm
by dragonator
MAsic12345 wrote:
Tue Oct 22, 2019 3:02 pm
How many amperes consumes HP 45?
Each nozzle does 300mA, and I can fire at most 5 at a time, so the peaks are around 1.5A. Average should not go above 1A.

@inkjet:

Your schematic shows a pulldown on the address. However, my experience is that I needed separate resistors pulling down when I used led drivers. Adding something like 2k2 fixed the problems. How big would the address pulldowns be in reality? Where did you get most of the information you are sharing?

Re: Hacking the HP45

Posted: Fri Oct 25, 2019 12:41 pm
by inkjet

Re: Hacking the HP45

Posted: Tue Oct 29, 2019 6:52 am
by Priyashree
Is anybody heard of XMOS microcontroller. As i have read it has parallel processing capabilities with programmable I/O control. Its mainly a software based control. 200mhz operating frequency is useful when we deals with timing critical signals. I hope it would a better alternative to FPGA as well as suitable MCU for driving HP45 cartirage.

Reference : https://www.eejournal.com/article/20150401-xmos/

Re: Hacking the HP45

Posted: Wed Oct 30, 2019 2:49 pm
by maxt
Hello Inkjet

you posted photos about lot's of interesting boards. However you hid the information necessary to search for more info about these boards.

This is fair, if you can't share these info, however the photos themselves are not useful to us, unless you explain better what function they do and possibly how can we procure them....