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Topic: Serial back pack with 16x2 LCD (Read 325 times) previous topic - next topic

arssant

#15
Nov 08, 2014, 12:12 pm Last Edit: Nov 08, 2014, 12:42 pm by arssant
Hi.

It's look like your not alone in the dark with this device:

Yesterday I found this:

http://forum.arduino.cc/index.php/topic,180919.0.html

I's on the French section ( my native language ). As I could reed, the guy give up of the interface board and used the lcd as a parallel one.
So far, over the topic, some one point to here:
http://playground.arduino.cc/Code/LCD

"Parallax™ Serial LCD's - Library for controlling Parallax™ 3-wire serial LCD's
Parallax™ Serial LCD's (Arduino 1.0) - Library for controlling Parallax™ 3-wire serial LCD's "

Can´t say more about it.
And Paul_B was on the right way:

"It does not contain a true RS-232 to TTL level converter.  It is CMOS logic (I suspect it is in fact, a PIC chip of some sort

floresta

Quote
And Paul_B was on the right way:
Quote
"It does not contain a true RS-232 to TTL level converter.  It is CMOS logic (I suspect it is in fact, a PIC chip of some sort
What about these:

Reply #2 -- "You also have to determine if they are expecting true RS-232 signals (-12v/+12v) or TTL versions (+5v/0v)."

Reply #4 -- "On page 1 it says that it can be driven from a BASIC Stamp which is just another 5v microprocessor with no real RS-232 capabilities."

Reply #8 -- "The I/O pins only provide a 0 to +5 volt swing (outside of RS-232 specs)"

Reply #9 -- "Even though it is geared to RS232 voltage levels it still may respond appropriately to TTL levels.  In other words it may interpret negative voltages and very low positive voltages as a logic '1' and positive voltages above 3 volts or so as logic '0'."


Don

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