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Forum Index : Microcontroller and PC projects : Another alternative take on PicoMite with multi LCD displays

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panky

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Joined: 02/10/2012
Location: Australia
Posts: 918
Posted: 11:39pm 13 Jan 2022
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Like Mick, I decided to try my hand at a PCB for the PicoMite to support the new release that has support for SSD1963 displays.

My take uses the 5" LCD formfactor, but also has connectors for the 2.8" ILI9341 and 3.5" (RPi pinout) ILI9481 based LCDs.

I also include a WEMOS D1 mini pro as an expansion option running Annex RDS to provide an extra I2C or SPI or just a few GPIO options.

All I/O connectors shown are JST but could be any 0.1" spacing connectors.

Power supply configurations allow for external 5V to a 3V3 reg to provide all power to the Pico.


Picomite backpack 1.1-schematic.pdf

3.5" RPi form ILI9481 LCD mounted


2.8" ILI9341 LCD mounted


Board only without any modules installed


Board with all modules installed


5" SSD1963 LCD mounted


I may make a few minor changes but hope to go to a board maker next week.
... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!
 
flasherror
Senior Member

Joined: 07/01/2019
Location: United States
Posts: 137
Posted: 01:32am 14 Jan 2022
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Looks nice. What PCB software are you using?

Do you have traces running under the Wemos antenna area? The render looks like a D1 Pro rather than the non-Pro board.
Even though the female PCB socket and male header pins (assuming it is not soldered directly to the board) will raise it off the PCB I wonder about the effect of antenna radiating into signal traces.
If D1 Pro you could use an external antenna, but regular D1 mini uses a PCB trace antenna, not sure if main board traces can affect Wifi signal etc
Edited 2022-01-14 11:38 by flasherror
 
panky

Guru

Joined: 02/10/2012
Location: Australia
Posts: 918
Posted: 01:54am 14 Jan 2022
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@flasherror

I am using DipTrace as the PCB software and I pull 3D CAD module objects in FreeCAD then export them out as .step so I can add them to my pattern library. They are just for show really but help to envisage what the final project will look like.

You are correct re the traces under the D1 mini but the ones I have a pro and I intend to use an external antenna (in fact, the pro's I ordered came with the antenna and cable).

I might try to re-route the traces just in case.
... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!
 
Mixtel90

Guru

Joined: 05/10/2019
Location: United Kingdom
Posts: 1482
Posted: 07:41am 14 Jan 2022
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Lovely board! :)
It appears that, as it was for me, it was just too much of a challenge for you to pass by. lol

I seriously considered doing a full-size "backpack" for the SSD1963 but eventually decided to keep it within the 100mmx100mm footprint for cheap JLC boards. Perhaps it was the wrong decision, I don't know. I've never used JLC for anything above that size so far. I also see you've not been shy of using some SMD. That was something else I seriously considered but I was also thinking of the I2C expansion module at the same time. I consider that to be more of a beginners module and it's all through-hole, so I decided to keep the adapter the same as I wasn't really short of component space.

I like what you did with the displays, that adds a lot of flexibility, especially as you've kept support holes for the ILI9341, which is definitely "flappy" unless you fit the SD connector.
-- Mick

Zilog Inside! nascom.info for Nascom & Gemini
 
panky

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Joined: 02/10/2012
Location: Australia
Posts: 918
Posted: 10:36am 14 Jan 2022
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Thanks Mick, I really enjoy creating boards and as you say, a challenge I couldn't resist - it's just for myself really but if anyone wants it, they only have to ask.

I stick to 1206 SMD which are not too bad as far as soldering goes although at 73, my eyes are starting to struggle and hands not as steady as they used to be (usually just 1 or 2 glasses of wine after dinner so shouldn't be the DTs     )

I use a local Australian PCB guy - about A$100 for 5 boards this size - quite a lot dearer than JLC but he offers 5 day turnaround and I like the idea of supporting a local company. I don't do a lot of boards so I can afford to lash out occaisionaly.

Doug.
... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!
 
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