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Character LCDs / Re: Trouble with serial interface on NHD-0420D3Z-FL-GBW-V3
« on: September 28, 2015, 05:12:14 PM »
Okay, in case any other amatuers find this thread I solved my own problem. It turns out PC's serial ports use RS-232, but the voltage for a HIGH signal is negative (on my computer it's about -6V). I need a chip to translate the PC's RS-232 signal to TTL logic levels. I found this useful post about it:
https://www.sparkfun.com/tutorials/215 using a MAX232 chip to convert PC rs-232 to TTL levels the display will be able to use.
https://www.sparkfun.com/tutorials/215 using a MAX232 chip to convert PC rs-232 to TTL levels the display will be able to use.