Search found 71 matches

by davidk
Fri Apr 06, 2018 7:52 pm
Forum: 3DP printing
Topic: HACKING an inkjet printer printhead
Replies: 11
Views: 7487

Re: HACKING an inkjet printer printhead

Hi,
This is a very interesting topic and thank you for sharing; I hope here we'll find a diy minimum usable configuration for a pro printhead control.
Aengel, can you post the images at a better resolution?
by davidk
Sat Mar 10, 2018 12:32 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 131423

Re: Hacking the Xaar 128 printhead

Hi BlueTurtle,
Can you give me more details about your ink?
Are you sure IPA won't damage the head?
by davidk
Sat Mar 03, 2018 7:54 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 131423

Re: Hacking the Xaar 128 printhead

Hi,

Indeed, working with high voltages and digital signals can be troublesome. For a prototype setup like ours, I would use relays.
What ink do you use? How do you store the printhead so it won't clog?
by davidk
Tue Feb 13, 2018 7:08 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 523
Views: 300266

Re: Hacking the HP45

Yes, the matrix I got from this site and the patent is correct. It's a bit messy I have to switch bits and this takes processing time.
by davidk
Tue Nov 28, 2017 5:19 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 523
Views: 300266

Re: Hacking the HP45

Thanks, BuddyButterfly! It's not a kicad project, I made it with Orcad. I can't sell boards because I ordered only 5 pieces. Meanwhile I changed the project, I use Arduino due to control the firing chip. Atmega64 was way too slow, it looses so much time for bit swaping and arranging data for address...
by davidk
Mon Oct 02, 2017 11:50 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 523
Views: 300266

Re: Hacking the HP45

The code is C, ATMega64. Regarding address select, I voted for direct demultiplexing, not UP/Down counter. That's because I thought this is more straightforward and, in the future, I could decide the address order for myself. You're right about the pin count and the availability. Still, you can redu...
by davidk
Mon Oct 02, 2017 8:41 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 523
Views: 300266

Re: Hacking the HP45

Hi, This is my code for firing L6452. Please look how simple is to use this chip: void jet(unsigned char address, unsigned int pdata,unsigned char pwr) //pwr = 0...10 ejecting power { unsigned char tmp; tmp=pdata%256; //-- set SPI primitive data, 16 bits SPDR=tmp; while(!(SPSR&(1<<7))) {;} //SPIF=bi...
by davidk
Fri Sep 29, 2017 7:54 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 523
Views: 300266

Re: Hacking the HP45

Hi Mahsa, I produce a 1-bit bitmap with ImagePrinterPro or some Photoshop. I made a C program that takes 16 bytes from the first bitmap row then 16 bytes from the second row and so on to build a vertical slice for print. Please check bitmap format for reference. Then I send the array ( less than 327...
by davidk
Thu Sep 28, 2017 4:11 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 523
Views: 300266

Re: Hacking the HP45

Looks very nice with all components added! Teensy is a powerful device. Though I think it would have been much easier to use L6452 and Teensy.
I corrected my small mistakes into my schematic and I'll show it to you soon.I hardly can wait to see your module drawing with ink!
by davidk
Thu Sep 14, 2017 3:26 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 523
Views: 300266

Re: Hacking the HP45

Hi, I made it work, now I can print graphics with HP45. Here is a sample printed on glass and another on paper. However, the output is a bit faint, althoug all nozzles are firing. I tried with 2.0us primitive time @12.0V, I'm afraid to go further. Should I fire the same pattern more than once for de...