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You'll definitely need those resistors (I2C pull-ups, RESET, REXT), so see if you can get them soldered in somehow.

And looking at the schematic, it seems you are using 5v+ for some of the...

A couple of things to look at:

According the datasheet, you'll need a pull-up resistor on the /RESET pin. Make sure you have that connected before you power it up.
And you'll need REXT connected...

I can't see from the schematic what is connected to the reset pin (pin 10 on your connector). I wonder if you'd need a pull-up resistor on that pin.

Sorry, I don't have any experience laying out this part, but it looks like there might be room right next to the 19/20 pins there!

It does look like you'll need the diodes, to ensure that there is...

Just noticed one more (tiny) thing. There is solder mask between the pads on the jumpers. Was this intended? This might make it hard to cut the trace and/or jump the pins.

NICE!

I see that you have a note that says "RTC Not Yet Implemented".

That would be my only suggestion left!

(Could be like the T3.2 with an optional through-hole footprint. Also,...

Terrific!

I'm sure you're thinking about these, but I noticed:

- Why not hook up the BATT_VIN/3 pin to one of the free analog input pins?

- G8 appears to not be connected to anything and...

Adafruit has ported the awesome Audio library to some of their boards. See: https://learn.adafruit.com/synthesizer-design-tool/audio-library-examples-on-trellis and https://github.com/adafruit/Audio

Terrific! Couple of thoughts/questions:

- Have you thought about mixing this with Adafruit_GFX hierarchy to provide compatibility with that API? Not sure where the actual primitives would come...

Neat! Will you be trying to merge this upstream?

No problem!

For just a USB keyboard, the Teensy LC should be plenty fast and has enough pins for your application.

If you need other features like a more memory or pins, an SD card slot,...

Totally doable. For the buttons, the most straightforward approach is to do a 8x9 matrix, that'll give you 72 positions. You could use one of the two leftover positions for the push button on the...

Can you elaborate on how you are trying to snap to grid? What does the Grid: popup menu under the icons along the top of the window say?


Yeah, that's definitely frustrating. I've taken to...

Check out https://platformio.org for command-line builds. You can specify gcc options in the platformio.ini file for a given project.

Try
Open() instead of
open()

:)

Very clever. Well done!

Well done, sir! This is great.

Take a look at the Teensy 4.1 schematic here: https://www.pjrc.com/teensy/schematic.html for a reference.

It may be easier for you to replace the Teensy 4.0 in your system with a Teensy 4.1, which...

There are two relevant pins in the MicroMod specification:

RESET - Input to processor. Open drain with pullup on processor board. Pulling low resets processor.

and

BOOT - Input to...

Sorry, can you point me to the SFE docs? I'm not seeing them...

If they did then it probably wouldn't be MicroMod compatible. The MicroMod pinout here https://www.sparkfun.com/micromod#tech-specs doesn't have any provision for ethernet pins.

I sincerely hope that the MicroMod pin labelled RESET# is a real old-fashioned cpu reset pin as described in the MicroMod pin description. :)

This forum is a good place to get help. Try posting your issue here with as many details as you can...

Definitely interesting!

Looking here https://www.sparkfun.com/micromod#tech-specs at least 8 of those 75 pins are reserved for mechanical keying.

And assuming that a MicroMod Teensy would be...

I'm using this library https://github.com/marcmerlin/FastLED_NeoMatrix/ to do 2D drawing and text on WS2812B leds arranged in a matrix. I suspect you could map your LEDs to a grid with it.
...

The platformio issue with ARM is a problem on 32-bit (armv7l), unfortunately. It's been broken for a year, but in the last couple of days there has been some activity toward workarounds and fixes...

Platformio is working great for me on macOS for Teensy 4.0 development. My recollection is that the toolchain is missing stuff for some ARM linux distributions, not sure about x86.

FWIW, I was able to make platformio work with tycmd to be able to specify individual teensies for upload. From one of my platformio.ini files:



[env:teensylc]
framework = arduino
platform =...

I don't know of any solution for reading those NFC tags with Teensy. I suspect that it would be too slow to be useful for button input anyway.

Have you looked into a mechanical slip ring for...

Coming late to the TeensyDebug party, it looks like it'll be a big help.

Unfortunately, I'm trying it out on a Teensy 3.6 first, which doesn't seem to be supported. (RAM_START and RAM_END...

If you zoom in on the PCB you should be able to see the pin numbers and see that pins 25-29 are on that interior/horizontal row. Pin 26 is indeed 3.3v. There are two other through-hole 3.3v pins are...

I believe Teensyduino includes a copy of FastLED, is it possible that you have two installed?

(I tried building a small FastLED project for TeensyLC with "#define FASTLED_ALLOW_INTERRUPTS 1" and...

I think this might be what you are looking for: https://github.com/platformio/platform-teensy/tree/develop/boards

Hadn't thought of that. It was a crazy idea.

Crazy idea for for saving space and time:

Remove the "const" for the declaration to pcolors, then rotate the data within the source buffer in place, call bteMpuWriteWithROPData8 and then rotate...

Ah, that makes sense. I hadn't tried that myself.

My workaround is just above that:...

Wait, is writeRect() the same as putPicture()?

Thanks, @KurtE! I'll give it a try.

I do see one issue, though, as the max size for all displays is not 1024 (it's 1280 in the ER-TFTM0784) so the size of rotated_row will be an issue. Also, it...

Check out this tip: https://forum.pjrc.com/threads/58781-PlatformIO-how-to-compile-for-Teensy-4-0-with-beta-core?p=245985&viewfull=1#post245985

Thanks for letting me know. My changes shouldn't break the support for the existing display, except for the removal of some global constants. Have you tried my changes on your display?

If it's...

Agreed, they'll definitely need to share a ground. The WS2813's have a minimum VDD of 3.5v, so I wouldn't run them at 3.3. And at 5v, they'll need 3.5v for the data line, so they'll need a level...

Sounds like an interesting project. I'm also working on a keyboard with high power requirements (LCD and backlights). vjmuzik's advice is good, that's what I was planning on doing, though I wasn't...

Hi. I see that my pull request for the ER-TFTM0874 was backed out. Will you be able to merge it back in now? Or do you need me to update something?

Also, I've been trying to port over a...

Thanks Which display did you see this behavior on? How is it different than before? (A pic might be helpful to me...)

Good question. I only have an ER-TFT074. I was hoping somebody here could give it a shot.

I'll change the graphics.ino back to defaulting to the original display. I'll also add a separate...

I've submitted a patch to get started on the ER-TFT074 support. It's here: https://github.com/wwatson4506/Ra8876LiteTeensy/pull/5

Comment:

Here's a patch for adding support for the...

While I'm working on support for the ER-TFTM0784 can somebody summarize for me which examples should be working? I'd like to test as much as I can...

Thanks for the excellent work on this library all! I've gotten an ER-TFTM0784 working well here and am impressed by the speed and quality of the software and hardware combo. Really digging the...

Another +1! I too subscribe to the "all warnings are errors" philosophy.

@silverlock: My opinion of the spurious compiler warnings is that they are also errors, but possibly in the compiler. ...

What CAD tool are you using?

If you are using KiCAD to design your board, there's a footprint here: https://github.com/XenGi/teensy.pretty
And one for Eagle here:...