steamrocks
Member
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 the Teensy 4.1 runs on 3.3 and I am told Teensy I/O is not 5 volt tolerant. I have powered the display up separately and found there is 5V on the SDA and SCL pins, which should connect to A4 (18) and A5 (19) on the Teensy 4.1, but I am hesitant to do this because of the warnings about voltage difference. Is it OK to hook the SDA and SCL of the Teensy 4.1 to these inputs? I tried running the display on 3.3V but this does not seem to work. Thanks in advance for any help you can give.
Les Knoll
Steamrocks@yahoo.com
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 the Teensy 4.1 runs on 3.3 and I am told Teensy I/O is not 5 volt tolerant. I have powered the display up separately and found there is 5V on the SDA and SCL pins, which should connect to A4 (18) and A5 (19) on the Teensy 4.1, but I am hesitant to do this because of the warnings about voltage difference. Is it OK to hook the SDA and SCL of the Teensy 4.1 to these inputs? I tried running the display on 3.3V but this does not seem to work. Thanks in advance for any help you can give.
Les Knoll
Steamrocks@yahoo.com