Search found 110 matches

by Wonko
Wed Oct 24, 2018 9:07 am
Forum: 3DP printing
Topic: Hacking cartridge HP 84/85
Replies: 162
Views: 365937

Re: Hacking cartridge HP 84/85

Instead of digitalWrite(8, HIGH); try PORTB|=1; and PORTB&=~1; . It directly manipulates the port instead of going through a lengthy subroutine to flip a bit. The delayMicroseconds() has the same issues for very short times. You can look at this link https://stackoverflow.com/questions/44051778/...
by Wonko
Tue Oct 23, 2018 12:24 pm
Forum: 3DP printing
Topic: Hacking cartridge HP 84/85
Replies: 162
Views: 365937

Re: Hacking cartridge HP 84/85

In the mean time, my printer arrived: HP something 90. It keeps switching itself off after a minute or two. I am afraid I have to return it :-( perhaps the power supply fails but did not come across this The seller of the DesignJet promised to take a look at it. He's selling various printers, so I ...
by Wonko
Sat Oct 20, 2018 10:01 am
Forum: 3DP printing
Topic: Hacking cartridge HP 84/85
Replies: 162
Views: 365937

Re: Hacking cartridge HP 84/85

Yes, you ca get this signal out of one of the fast Arduinos. To access pins really fast, you can write to registers directly: https://www.arduino.cc/en/Reference/PortManipulation . This manipulates 8 bits with a single instruction. Wait cycles can be an issue at those high frequencies. There is a ca...
by Wonko
Thu Oct 18, 2018 6:28 pm
Forum: 3DP printing
Topic: Hacking cartridge HP 84/85
Replies: 162
Views: 365937

Re: Hacking cartridge HP 84/85

Hi MAsic12345, 1: Note that the Teensy 3.5 and 3.6 uses 3.3V instead of most Arduinos with 5V. Teensy 3.5 is 5V tolerant, which is probably not so important here. There is also the Arduino Due with a Cortex CPU and 3.3V, but it runs at 80MHz . 2: Don't learn C++. Just learn C. C is far simpler and m...
by Wonko
Fri Oct 12, 2018 9:03 pm
Forum: 3DP printing
Topic: Oasis 3DP printer
Replies: 41
Views: 123912

Re: Oasis 3DP printer

This looks really fantastic. I love the video. Awesome work!
by Wonko
Mon Oct 08, 2018 9:25 pm
Forum: 3DP printing
Topic: Hacking cartridge HP 84/85
Replies: 162
Views: 365937

Re: Hacking cartridge HP 84/85

Very very good find!
by Wonko
Sat Oct 06, 2018 2:06 pm
Forum: 3DP printing
Topic: Hacking cartridge HP 84/85
Replies: 162
Views: 365937

Re: Hacking cartridge HP 84/85

OK, here is my approach. Next to the digital signals, Reset, Clock, and Data (x2), we need a Fire signal which seems to be digital as well. There may also be a Store signal that moves data from the shift register into flipflops, so that the fire signal can be independent of the shift clock. Also, si...
by Wonko
Sat Oct 06, 2018 1:10 pm
Forum: 3DP printing
Topic: Hacking cartridge HP 84/85
Replies: 162
Views: 365937

Re: Hacking cartridge HP 84/85

Aw, great :( - I did order a used HP Designjet 90 just because I want to figure out this puzzle. I also got some Teensy controllers. It's not that I don;t have enough to do in my life anyway! :lol:
by Wonko
Tue Oct 02, 2018 10:23 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 365
Views: 1313607

Re: Hacking the Xaar 128 printhead

I suggest something more fun: publish what you know about those heads here for everyone to read, and I will see what I can do to make schematics and code, which will likely be improved by others on this list, giving you the best starting point possible: peer reviewed code.
by Wonko
Sun Sep 09, 2018 7:38 pm
Forum: 3DP printing
Topic: Hacking cartridge HP 84/85
Replies: 162
Views: 365937

Re: Hacking cartridge HP 84/85

@dragonator, you are right. It is just a head with a matching tank. That is promising. I would still highly recommend to use, find, borrow and analogue scope and at least look at each signal once. If they end up all being digital, then that is a nice confirmation. If not, it may save hours and days ...