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I finally completed my first Teensy project. It's a custom keypad in a vertical format for use with graphics software alongside a Wacom tablet. It uses a Teensy 4, a micro SD Card and 3.75" TFT LCD...

Thank you. The Protocol Buffers material look interesting also, but the simplicity of the serial option might be just what I need for this project.

Thanks jdriedger. I was unaware that I could communicate with serial over the same USB being used for other things. That does look like the simplest method.

I have a Teensy 4 running an application that has some settings that are read at startup. The C++ code contains those setting in the source. I would like to be able to modify the settings without...

I've brushed away as much as possible to narrow down this issue. At first glance, it seems very similar to a posting someone else made on the forums regarding Blinkie code "fixing the problem", but I...

Yes, only one Teensy 4 is connected. Wiring is unchanged, lengths, cables, hardware setup. It was working fine, then after one compile this message began appearing. Sometimes (maybe one in 10 times)...

I've begun seeing this error command ("error sending reboot command (HID)") when upload to a teensy 4. It happens approximately 90 times out of 100, with the other ten occasions working successfully....

Suggested solutions have resolved the issue...

@defragster--Windows 10 OS, Teensy Loader 1.49.

I can confirm some of the timing issues you mentioned--Drilling into some of the keyboard...

I've been having some difficulties with getting a compile to succeed for a Teensy 4 when my code utilizes the Keyboard library.

The code only successfully compiles (when it includes the command...

A minimal Teensy 4 Sketch in the Arduino IDE consisting of using the function:

Keyboard.Print("Hello");

...yields an error message of
"....Multiple libraries were found for "Keyboard.h"...."...

[QUOTE=KurtE;226861]In cases like this, it would be good if you could give a link to the display that you are using...


Good point, KurtE: The display I am using is this...

Gibbedy:
According to the LCD docs, it should be fine with a supply from 3-5volts so I expect is would not be because the teensy 4 is 3.3v.

defragster,
I am not certain of the expected current...

Gibbedy:
According to the LCD docs, it should be fine with a supply from 3-5volts so I expect is would not be because the teensy 4 is 3.3v.

defragster,
I am not certain of the expected current...

I've been playing with a small matrix keypad with diodes and the Teensy 4 and keypad library. A small test application I wrote that works fine on an Arduino Pro Micro was behaving differently on the...

I am attempting to control the brightness (via the LITE pin) on a 3.5" LCD TFT (HX8357 based) display with a PWM output from a Teensy 4. Previously, I was able to do this on a SparkFun Pro Micro...

[QUOTE=PaulStoffregen;226088]After you've pressed the button, does the red LED stay on solid, or blink slowly?



The red LED stays on steady.

As you suggested, I tried another cable. That...

I have done a fresh install of the Arduino 1.8.10 IDE, followed by an install of the TeensyduinoInstall.exe 1.48.

I am using a basic sketch that compiles with no issues.
Arduino menu:
Board is...