Dan Julio

Electrical Engineer living and working in the foothills above Boulder, CO.

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This user joined on 02/22/2016.

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Mitsuru Yamada wrote 04/24/2022 at 01:04 point

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Mitsuru Yamada wrote 01/31/2021 at 01:10 point

Thank you for liking my #PERSEUS-3 6802 homebrew computer !

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Ken Yap wrote 10/16/2020 at 02:41 point

Thanks for liking #6 segments suffice !

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Jonathan Bruneau wrote 10/21/2018 at 06:18 point

Dan: your DL1416SmarTerm project is awesome!  Excellent work!

I also decided to follow your solar MPPT project.  I'm looking forward to see how you ended up implementing your final design.

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Dan Julio wrote 10/21/2018 at 19:39 point

Thanks Jonathan.  I think we live in the same city.  I read with interest your excellent project documentation on your own MPPT charger.  I definitely empathize with some of the issues you have faced.

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tomkrst wrote 11/01/2017 at 11:56 point

Hi Dan

Really liked your serial to parallel printer solution.

Just wondering about some details of the project and how it is powered up.

Does it get its power directly from the printer or via the USB interface?

Also, would it be possible to get the code that the interface runs to convert from  serial to parallel ?

I am a bit new to arduino type projects, but I need to build such a device such as you have to help an elderly friend of mine who has a unit which prints out via a serial rs232 port. The unit does not have a USB or parallel interface and outputs only in Epson or hp protocol.

Ideally,  I wanted to find some sort of Rs232 -> USB b converter to print directly from the legacy rs232 unit to a USB printer, but realise that this is not an easy solution as there is likely a requirement for some sort of bridge to convert the protocol from rs232 to USB. Nothing on the net had anything like this.

Anyhow, I would really be grateful if you could share with me the aduino code or any other information from your project so that I can help my friend.

You can send me the info on if it's ok.

Keep up the great work !!! 

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Dan Julio wrote 11/01/2017 at 17:00 point

Hi Tom,

You should be able to download both the schematic and arduino code for this project from the post.  Look for the section called "FILES".

My circuit normally gets power from the printer.  There is a schottky diode connecting the printer's +5 volt supply to the Arduino Pro-Micro raw voltage input (J1 is closed to bypass the on-board voltage regulator since we're supplying 5 volts).  This diode allows powering the arduino section from its USB port so that code can be loaded without the printer being powered.  It prevents power from the USB port flowing backwards into the printer.

Regarding your desire to print to a USB printer from RS232.  I wonder if something could be cobbled together cheaply using a Raspberry Pi (or Pi Zero since it is so cheap).  Have the pi's serial port take data from the RS232 device (though appropriate level shifting circuitry) and then spool it through Linux's printer software to an attached USB printer.

Anyway, let me know if you have any other questions about my HP printer project.
Regards, Dan

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rajesh.chunduri wrote 12/02/2016 at 18:18 point

hello Dan! i tried to contact you. Please let know your free time.

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rajesh.chunduri wrote 12/02/2016 at 18:17 point

Hello Dan! i tried to contact you. Please let know your free time.

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Michel Kuenemann wrote 11/27/2016 at 06:41 point

Hi - Thanks for skulling my PowerBucket project - Michel

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Eric Hertz wrote 11/07/2016 at 01:31 point

Howdy! Thanks for the skull! And nice work on the LED-computer!

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Dan Julio wrote 11/07/2016 at 01:34 point

Thanks and howdy back. Enjoyed reading through your various projects.

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oneohm wrote 10/05/2016 at 07:35 point

Thanks for following! - you might also like my printer:

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Samuel A. Falvo II wrote 03/25/2016 at 16:38 point

Thanks for the skull!  :)

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Dan Julio wrote 02/25/2016 at 02:16 point

You too, Sophi!  Hello again.

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Sophi Kravitz wrote 02/23/2016 at 20:56 point

Dan! I remember seeing your beautiful art work a few years back. Nice to see you here :)

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