Search found 77 matches

by davidk
Tue Nov 28, 2017 5:19 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890074

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: 749
Views: 2890074

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: 749
Views: 2890074

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))) {;} //SPI...
by davidk
Fri Sep 29, 2017 7:54 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890074

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: 749
Views: 2890074

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: 749
Views: 2890074

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...
by davidk
Fri Sep 08, 2017 8:06 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 365
Views: 1313270

Re: Hacking the Xaar 128 printhead

I was also glad because I read piezo heads can handle almost any fluid -which is not the case with this xaar. I had a head that I destroyed after a short test with water. I read the documentation again and they say it runs on aqueous inks. By the way, there's no direct reference about supported inks...
by davidk
Wed Aug 30, 2017 8:21 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 365
Views: 1313270

Re: Hacking the Xaar 128 printhead

Where can I find a proper capping for this head? And not too expensive...
by davidk
Mon Aug 21, 2017 5:40 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890074

Re: Hacking the HP45

What's the maximum fire rate you can achieve?
by davidk
Sat Aug 19, 2017 5:12 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2890074

Re: Hacking the HP45

Hi, Please look back in my previous posts for the schematic and my observations. Another thing, I bought an old HP printer and I took the printhead connector and the rubber capping system to seal the printhead. The microcontroller is slow, because I loose so many time rearranging bits for firing cyc...