Author Topic: HP3548 / HP3457 OLED display  (Read 23613 times)

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Offline sagias

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Re: HP3548 / HP3457 OLED display
« Reply #75 on: March 11, 2024, 11:52:56 am »
fw compiled and works flawessly
i provide the filee
 

Offline cncjerry

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Re: HP3548 / HP3457 OLED display
« Reply #76 on: March 12, 2024, 04:15:39 am »
What oleds did you use?
 

Offline Kean

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Re: HP3548 / HP3457 OLED display
« Reply #77 on: March 12, 2024, 05:30:05 am »
What oleds did you use?

The ones linked earlier in the thread are no longer available, but at least the listing with specs and dimension drawing are still there.
I found another listing with similar specs, pin out, and dimensions - but I have not ordered any yet.
https://www.aliexpress.com/item/1005005770683719.html

The price of these is better that the previous listing, but I also saw some even cheaper but from "less reputable" sellers (not necessarily untrustworthy, but just lower reputation).
I will probably order 50 of them in the next couple of days as I want to convert a few meters, and can use these on other projects as well.  I guess I need to order the PCBs and other parts too...
 

Offline sagias

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Re: HP3548 / HP3457 OLED display
« Reply #78 on: March 12, 2024, 05:36:08 am »
As described on xyphros github
 

Offline sagias

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Re: HP3548 / HP3457 OLED display
« Reply #79 on: March 16, 2024, 11:03:28 am »
Prove
 

Offline Miti

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Re: HP3548 / HP3457 OLED display
« Reply #80 on: April 02, 2024, 02:51:24 pm »
What about this OLED? Reputable and the visual area seems to be a little wider, it fills the space between digits better.

https://www.buydisplay.com/white-0-87-inch-oled-display-panel-128x32-iic-i2c-ssd1316

Edit: Ignore, the visual area is the same, just different source.
« Last Edit: April 02, 2024, 03:02:22 pm by Miti »
Fear does not stop death, it stops life.
 

Offline Kean

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Re: HP3548 / HP3457 OLED display
« Reply #81 on: April 07, 2024, 06:25:59 am »
I've just received 20 PCBs and 60 of the previously linked OLEDs [1].  Hopefully in the next week or two I will find time to assemble a sample and check operation.
If any of the Aussie followers of this topic are interested, then feel free to DM me your interest in either bare or partially assembled PCBs.
I may have some OLEDs left over from my builds, but otherwise it is not hard to source them yourselves.

[1] https://www.aliexpress.com/item/1005005770683719.html
 

Offline TERRA Operative

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Re: HP3548 / HP3457 OLED display
« Reply #82 on: May 21, 2024, 12:12:09 am »
I'm currently spinning up my own version of this design and replacing the DC-DC converters with something a little cheaper.

Can someone who has built one of these measure the voltage and current draw from the output of each DC-DC converter with the displays lit to the maximum number of pixels by chance?
« Last Edit: May 21, 2024, 12:52:43 am by TERRA Operative »
Where does all this test equipment keep coming from?!?

https://www.youtube.com/NearFarMedia/
 

Offline TERRA Operative

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Re: HP3548 / HP3457 OLED display
« Reply #83 on: May 23, 2024, 09:28:46 am »
So, I've made my own spin of this board. I swapped out the expensive buck converters with cheaper options (still from TI) and optimised the layout somewhat.
I also spaced the two halves of the PCB so they can be easily cut apart with one of these. (Ignore the trace connecting the two sides, it's just to try to trick the PCB manufacturers into thinking it's not two separate designs....  ;D )

The BOM file is such that it should be able to be dropped into JLCPCB for assembly, I think... I haven't tried so let me know how you go...

It should all just work (I made no major changes besides the DC-DC converters) so take this as a Beta version until verified by someone.  :P


As for the displays, you can get them on Aliexpress, but JLCPCB has them in their catalogue for their assembly service too.


I plan to get a bunch made sometime soon-ish, so I'll report back once it's done.
« Last Edit: July 19, 2024, 06:02:01 pm by TERRA Operative »
Where does all this test equipment keep coming from?!?

https://www.youtube.com/NearFarMedia/
 
The following users thanked this post: rsjsouza, damien

Offline kawal

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Re: HP3548 / HP3457 OLED display
« Reply #84 on: July 17, 2024, 06:32:37 pm »
Seems you have the wrong footprint in the BOM for U3. The SOT-23-5 should be used not SC-70-5. others seem ok
 

Offline TERRA Operative

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Re: HP3548 / HP3457 OLED display
« Reply #85 on: July 18, 2024, 03:51:45 pm »
Seems you have the wrong footprint in the BOM for U3. The SOT-23-5 should be used not SC-70-5. others seem ok

This is the part specified:
https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LVC1G86DCKR?qs=d9gICRQKuCdmtPquTT%2F3UA%3D%3D
https://www.digikey.com/en/products/detail/texas-instruments/SN74LVC1G86DCKR/381330

Note the 'DCKR' at the end of the part number in the 'manufacturer part#' in the BOM. 'DCK' indicates the SC70 package type as shown on page 1 and 14 of the datasheet.
Where does all this test equipment keep coming from?!?

https://www.youtube.com/NearFarMedia/
 

Offline kawal

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Re: HP3548 / HP3457 OLED display
« Reply #86 on: July 19, 2024, 11:27:27 am »
Yes the that  part - the footprint in the design is for SOT-23-5 and the bom has the SC-70 part

Attached is the board with SOT-23-5 placed on it - The SC-70-5 will not fit. I found out the hard way  - by ordering boards on JLCPCB with parts per BOM. 

You need to change the BOM to show the SOT-23. Its your EDA software issue.  Mixed up  footprints.
https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LVC1G86DBVRE4?qs=nqigI8dpoHLKLfGKub4Tlw%3D%3D

While you have the SC-70 version in the BOM you have the footprint for SOT-23.
Hope it will not cause mechanical assembly  issues as the SOT-23 is probably higher off the board.
Hope that is clear.

« Last Edit: July 19, 2024, 11:32:30 am by kawal »
 

Offline kawal

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Re: HP3548 / HP3457 OLED display
« Reply #87 on: July 19, 2024, 02:32:19 pm »
I am hoping to use these in a HP 3852A  that uses 2 of these displays.  Would be super nice .  Also have a few HP 66XX power supplies.

 

Offline TERRA Operative

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Re: HP3548 / HP3457 OLED display
« Reply #88 on: July 19, 2024, 06:03:22 pm »
Yes the that  part - the footprint in the design is for SOT-23-5 and the bom has the SC-70 part

Attached is the board with SOT-23-5 placed on it - The SC-70-5 will not fit. I found out the hard way  - by ordering boards on JLCPCB with parts per BOM. 

You need to change the BOM to show the SOT-23. Its your EDA software issue.  Mixed up  footprints.
https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LVC1G86DBVRE4?qs=nqigI8dpoHLKLfGKub4Tlw%3D%3D

While you have the SC-70 version in the BOM you have the footprint for SOT-23.
Hope it will not cause mechanical assembly  issues as the SOT-23 is probably higher off the board.
Hope that is clear.



Gotcha, you are absolutely correct. The footprint was indeed incorrect in the EDA software so I've made the corrections (including making my own correct footprint) and attached v1.1 of the design to this message.
v1.0 in my previous post has been corrected to reflect the correct SOT-23-5 part in the BOM too.

It looks like the SOT-23-5 part is shorter that the 2.54mm pitch pin headers when the two boards are put together (part is 1.45mm tall, board spacing is 2.54mm apart), so there shouldn't be a clearance issue to use a SOT-23-5 part.
Where does all this test equipment keep coming from?!?

https://www.youtube.com/NearFarMedia/
 


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