Author Topic: HP3548 / HP3457 OLED display (Read 24762 times)

sagias · « **Reply #75 on:** March 11, 2024, 11:52:56 am »

fw compiled and works flawessly
i provide the filee

cncjerry · « **Reply #76 on:** March 12, 2024, 04:15:39 am »

What oleds did you use?

Kean · « **Reply #77 on:** March 12, 2024, 05:30:05 am »

Quote from: cncjerry on March 12, 2024, 04:15:39 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...

sagias · « **Reply #78 on:** March 12, 2024, 05:36:08 am »

As described on xyphros github

sagias · « **Reply #79 on:** March 16, 2024, 11:03:28 am »

Prove

Miti · « **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.

Kean · « **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

TERRA Operative · « **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?

TERRA Operative · « **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....

)

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.

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.

(See further down the thread for latest version)

kawal · « **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

TERRA Operative · « **Reply #85 on:** July 18, 2024, 03:51:45 pm »

Quote from: kawal 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

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.

kawal · « **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.

kawal · « **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.

TERRA Operative · « **Reply #88 on:** July 19, 2024, 06:03:22 pm »

Quote from: kawal 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.

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.

kawal · « **Reply #89 on:** August 21, 2024, 01:52:34 am »

Quote from: TERRA Operative on July 19, 2024, 06:03:22 pm

Quote from: kawal 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.

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.

Ok new issues for these custom boards. The power supplies are not starting. The 3.3v supply is 1.6V and without the 3.3V there is no 8V. Troubleshooting this now. Total draw is 0.6mA so obviously power supply issue.

.....

The resistor values are wrong on the 3.3V regulator. The schematic shows 16.5K and 10K which will give 1.59V ...
The calculation for the part used is 0.6v * (1+Rx/Ry). You probably assumed that the part is a 1.25V reference part, but it has 0.6V reference. To fix this the resistor to ground needs to be 3.666k or the resistor to output needs to be 45k.
The 8V resistors are calculated properly.
I replaced the 10K R27 with 3.6K and the supply now comes up at 3.3V and shortly after the 8V supply shows up.

On a side note can someone confirm the Fuse settings for the atmega8 ? I assumed the following fuses :

TERRA Operative · « **Reply #90 on:** August 21, 2024, 04:23:37 pm »

Thanks for being my alpha tester!

I'll make a revision and upload a new version with the BOM change in my previous posts.

And done.

kawal · « **Reply #91 on:** **Today** at 01:30:28 am »

The fuse settings i chooses seems to work but the startup behavior is not consistent.

I will try with brownout detection and some startup delay.

kawal · « **Reply #92 on:** **Today** at 03:51:13 am »

The fuse settings did the trick. Each restart is clean.

TERRA Operative · « **Reply #93 on:** **Today** at 05:42:56 am »

Nice! It looks great!

How well does it all fit on the inside?

kawal · « **Reply #94 on:** **Today** at 12:53:58 pm »

The fit is good. Its a little snug to get in .
I wish the font was a bit bigger.

Next is to test in HP 3852A that uses 2 of these displays. Also have a few HP 66XX power supplies to test as well.
Maciej


EEVblog Main Site	EEVblog on Youtube	EEVblog on Twitter	EEVblog on Facebook	EEVblog on Odysee

Author Topic: HP3548 / HP3457 OLED display (Read 24762 times)

Share me