I’d suggested a larger pcb… room for the circuits we haven’t realized we need at this time. Very little cost increase at most fabs I’ve used. Then again, time pressure!

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The MOSFET in the level shifter are not magic parts… There are certainly other low Vgs parts that will work. Maybe let me know what parts you have available and I can look for a likely candidate?

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The level translator circuit topology is used on MANY level shift modules such as this:

It’s a tried and true circuit… We could see what other MOSFET have been used if people have these and can check what parts were used. For now, if you do include the circuit, populate the 0-ohm resistor, leave the MOSFET off and only use one set of pull-up resistors.

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For pull-ups… 1.47k and 1.9K are not magic values… Anything in that general area would be fine. Just looking for sufficient pull-up current to handle more than usual capacitance on the lines. The 3.3V side is where it matters the most… much less so on the very short low capacitance 5V side. If you like, let me know a few values you have available and I can check them against the tables. Again, not critical values!

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I’ll put together a footprint for the much larger 4x20 display. The smaller 4x20 was from a link you had in the schematic. It was such a nice fit to the available space!

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Into the footprint editor!

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Using this generic display for dimensions… 97 mm x 60 mm which is typical for the commonly available display.

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Bob

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