Hacking the HP45

[dragonator]

I have included 2 images. The V3.02 controller (the firmware of the Teensy 3.2 based controller) and the V4.02 controller (the firmware of the Teensy 3.5 based controller). The addresses run top to bottom on both. The pin mapping of this primitives should be possible to change just by changing the pins on the microcontroller, but the address mapping needs to be fixed in the table. As you can see in the images, the mapping of the addresses is completely wrong.

[Dries Vandenbroucke]

Hi everyone,
We're two 18 year old students studying Industrial Engineering and for our annual engineering test, we've decided to build an Oasis 3DP ourselves.

We've fully constructed the Oasis 3DP machine and have soldered the V4.02 HP45 controller. All that's left now is trying to make the HP45 V4.02 controller run on the V3 software (which uses bit-banging instead of DMA) whilst using a Teensy 4.1.

We are somewhat clueless of how would make all of this work in this way. We've seen user "Ichrg" do exactly what we're about to do next. So if he can contact us at: "zandprinter@gmail.com" and share some insight on how you did this, we would be very grateful and would be willing to help fix issues (like routing the addresses for the new controller).

Or if anyone else has some info they can share on how we would best approach this task, this would be appreciated.

Email: zandprinter@gmail.com
Or: send us a message back!

Thanks in advance!!

[dragonator]

Have you had any mails regarding this? I have no experience and pointers beyond what I already told you by mail, but do like to see this project succeed.

[exalted coding]

Do any of you have this document:

800e6d22 Inkjet Writing Systems Design Fundamentals(HP document).

Appreciate it if someone could provide me with this document.

[Catniped]

Hi everyone,
We're two 18 year old students studying Industrial Engineering and for our annual engineering test, we've decided to build an Oasis 3DP ourselves.

We've fully constructed the Oasis 3DP machine and have soldered the V4.02 HP45 controller. All that's left now is trying to make the HP45 V4.02 controller run on the V3 software (which uses bit-banging instead of DMA) whilst using a Teensy 4.1.

We are somewhat clueless of how would make all of this work in this way. We've seen user "Ichrg" do exactly what we're about to do next. So if he can contact us at: "zandprinter@gmail.com" and share some insight on how you did this, we would be very grateful and would be willing to help fix issues (like routing the addresses for the new controller).

Or if anyone else has some info they can share on how we would best approach this task, this would be appreciated.

Email: zandprinter@gmail.com
Or: send us a message back!

Thanks in advance!!

hi, i am also attempting to achieve the same thing, would be amazing if you could share any discoveries or pointers you stumble upon

[BangDingOw]

Hey guys, thanks for the invention. Sorry to get out of topic. Is there any specific reason to use teensy microcontroller other than most commonly cheap and available like esp32 or stm32 for controlling the print head? Because in my country teensy price is almost $80 for the 4.1. I’m interest to build oasis for making sand casting moulding

[dragonator]

There is no fundamental reason why to use it, other than it being available, has good peripherals, plenty of I/O, and good libraries. The ESP32 was either new, or not available when I started, this, and I stuck with what worked.

The ESP32 is powerful enough to run this. I think it has enough IO, but I am not sure. To control an HP45, you will need around 20-22 I/O, mostly output.

What is needed is the same issue preventing the V4 controller from being useful right now. The V4 firmware is hardcoded for a Teensy 3.5 because it uses a Teensy 3.5 specific bit of hardware. The V3 controller firmware is a bit more general, but that firmware is older and has fewer features. Getting the ESP32 to work with the HP45 will take a bit of modification of the firmware.