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I received the level shifter and guess what: it works! Using the level shifter I'm able to work with both of my LCD modules, able to print() and everything else too.

Thanks again for the help...

Welp, tried a couple more things:
Modified Wire.write() to also do Serial.println() so I could verify both the Arduino and Teensy are issuing the same I2C codes (they are)
per a suggestion I...

I tried out the following:


Adding delay(100) before lcd.init()
Using <LCD03.h> (adjusting for 0x27 I2C address)
Using <LiquidCrystal_PCF8574.>


No luck :( With the alternate libraries I...

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Scanning...
Device found at address 0x27 (MCP23017,MCP23008,PCF8574,LCD16x2,DigoleDisplay)
done

I'm using pins 19 (SCL) and 18 (SDA) and have them wired up correspondingly (I Sharpie'd a black stripe on the SCL wire to make sure) and have tried reversing them and have also tried using the...

Thanks Paul!

I'm using John Rickman's LiquidCrystal_I2C library intended for DFRobot I2C LCD displays: https://github.com/johnrickman/LiquidCrystal_I2C

The 16x2 I2C LCD I test with is an...

Howdy,

I am having a perplexing issue where I can get an I2C LCD to partially work with my Teensy 4.1 with LiquidCrystal_I2C. The LCD has an I2C 'backpack' board which is connected to 3.3V, GND,...