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Thanx SO much! I have zero experience with touchscreens so this will be an adventure. Glad to know it won't be hampered with interference from the SD applications. Must see where there is documentation on how to both drive the display and pick up on how touching the screen initiates controls.

I take it that since I have a Teensy 4.1 with a built in SD (Thanx so much Paul for helping me get the SD up and running) I should have no concerns about SD cards and the display working, as long as I connect the display to the pins shown in the device description and use the suggested...

Michael, The pololu seems to be the totally simplest and most cost effective option. Many thanks for the suggestion. Pololu seems to be a good place. I ordered additional things from as well besides the level shifter. I might STILL experiment with the touch screen that is available for...

I have a Teensy 4.1 that I wish to use it with a Sunfounder I2C LCD2004 4 x 20 LCD display. It is the one with 4 wire input which requires only 2 I/O lines. I see clearly how to hook it up, have an identical unit working with an Arduino Mega. My only problem is that the LCD requires 5V and...

MANY THANX, PAUL! One line of written code is worth 1000 verbal descriptions! You can see from my code above that I misinterpreted the verbal info! I can get SD to open now, and now I'll mess with read/write tests. FYI this is for a fully programmable percussion sequencer or "Drum Machine"...

Adding to the list of things that DONT work, I talked to Paul and he said you have to put in a statement "chipSelect=BUILTIN_SDCARD in code for the 4.1, after which the usual SD libraries from Arduino should work. Below is my code for a simple test, only testing if the SD is functioning...

I am an experienced Arduino user making the switch to Teensy and finding it painful. I recently got the full featured 4.1 with built in SD card, but can find no way to access it. Arduino's SD library won't work SdFat won't work Examples sketches from forums using older boards won't work My...