Hello everyone,
I am initiating to build OASIS, but being a mechanical guy I have certain confusion. 1) Is there any way to work with teensy 4.0 or 4.1, if anyone has tried then please share your feedback. 2) HP45 V3 is good to go with or V4? when considering teensy 4.0 or 4.1.
Your guidance and detailed suggestions for the above query will be very helpful.
Hacking the HP45
Re: Hacking the HP45
youd need to rewrite the firmware to make it work with 4.0/4.1
Re: Hacking the HP45
Thank you for the guidance. Can you elaborate about the required changes in firmware, if u have done it? , And there is no major modification required on the hardware side?
Re: Hacking the HP45
i havent done it, youd have to do it yourself. about the hardware i have no idea, maybe dragonator can elaborate more.
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dragonator
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Re: Hacking the HP45
Short answer: It is difficult without new electronics and rewriting the code.
Longer answer:
The V3 that is shared on hackaday in Oasis is the easiest to convert to a new microcontroller. This version did not use DMA and all sorts of fancy tricks to get the speed up. It does have some hardcoded elements like a special delay for inkjet, but it does not use any specific hardware of a microcontroller and simply bitbangs the inkjet controller. However the V3 controller is designed around a smaller Teensy 3.2, with all the back pins used as well. This was a challenge to make, but for us this also means that the Teensy 4.0 does not have enough pins to control it.
The V4 uses only the pins that are breadboard compatible, so a Teensy 4.1 would be a good fit here. However, the V4 controller uses DMA to significantly speed up the printing speed (from around 50mm/s to around 120mm/s). The Teensy 4.1 handles DMA completely different, so this bit of the code will need to be rewritten or just replaced.
The "easiest" thing is to place a Teensy 4.1 in a V4 controller, and then rewrite the code of the Oasis V3 controller to work. This will give a slow version of the controller that should print. V4 also had a ton of self checks that either need to be rewritten, or removed (they never worked that well).
Both versions use microcontrollers that are 5V tolerant, so no protections against 5V were put in place. Teensy 4.0 and 4.1 are not 5V tolerant and will need these protections.
I stopped working on the inkjet stuff myself, so while I do answer questions as best I can, I do not intend to pick up this project in the future.
Longer answer:
The V3 that is shared on hackaday in Oasis is the easiest to convert to a new microcontroller. This version did not use DMA and all sorts of fancy tricks to get the speed up. It does have some hardcoded elements like a special delay for inkjet, but it does not use any specific hardware of a microcontroller and simply bitbangs the inkjet controller. However the V3 controller is designed around a smaller Teensy 3.2, with all the back pins used as well. This was a challenge to make, but for us this also means that the Teensy 4.0 does not have enough pins to control it.
The V4 uses only the pins that are breadboard compatible, so a Teensy 4.1 would be a good fit here. However, the V4 controller uses DMA to significantly speed up the printing speed (from around 50mm/s to around 120mm/s). The Teensy 4.1 handles DMA completely different, so this bit of the code will need to be rewritten or just replaced.
The "easiest" thing is to place a Teensy 4.1 in a V4 controller, and then rewrite the code of the Oasis V3 controller to work. This will give a slow version of the controller that should print. V4 also had a ton of self checks that either need to be rewritten, or removed (they never worked that well).
Both versions use microcontrollers that are 5V tolerant, so no protections against 5V were put in place. Teensy 4.0 and 4.1 are not 5V tolerant and will need these protections.
I stopped working on the inkjet stuff myself, so while I do answer questions as best I can, I do not intend to pick up this project in the future.
Re: Hacking the HP45
Thanks Dragonator for your valuable suggestions, It's very fascinating project and i feel I should give it try with V4 & teensy 4.1 and will update the status soon.
Re: Hacking the HP45
Hello everyone, I am looking to order a PCB for the HP45 V4, but most manufacturers require a Gerber file. Can anyone provide the Gerber file for the HP45 V4, or is there anyone selling the assembled PCB?
Re: Hacking the HP45
the pcb files are on the github page of the controller: https://github.com/yvodehaas/HP45-stand ... ller-V4.02
you can generate gerbers with kicad
you can generate gerbers with kicad